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| 1 | Diagenetic fluids evolution and genetic mechanism of tight sandstone gas reservoirs in Upper Triassic Xujiahe Formation in Sichuan Basin, China显示文摘The reservoirs of the Upper Triassic Xujiahe Formation in Sichuan Basin have the characteristics of low compositional maturity, low contents of cements and medium textural maturity. The general physical properties of the reservoirs are poor, with low porosity and low permeability, and there are only a few reservoirs with medium porosity and low permeability in local areas. Based on the diagenetic mineral association, a diagenetic sequence of cements is established: early calcites (or micrite siderites) →first quartz overgrowth→chlorite coatings→dissolution of feldspars and debris→chlorite linings→ second quartz overgrowth (quartz widen or filled in remain intergranular pores and solution pores)→dissolution→third quartz overgrowth (quartz filled in intergranular and intragranular solution pores)→intergrowth (ferro) calcites→dolomites→ferro (calcites) dolomites→later dissolution→veins of quartz and calcites formation. Mechanical compaction is the main factor in making the reservoirs tight in the basin, followed by the second and third quartz overgrowth. In a long-term closed system, only feld-spars and some lithic fragments are dissolved by diagenetic fluids, while intergranular cements such as quartz and calcit are not dissolved and thus have little influence on the porosity of the Xujiahe Formation. This is the third factor that may have kept the sandstones of Xujiahe Formation tight finally. The hydrocarbon was extensively generated from organic materials after the second quartz overgrowth, and selectively entered favorable reservoirs to form tight sandstone gas reservoirs. | ZHU RuKai ZOU CaiNeng ZHANG Nai WANG XueSong CHENG Rong LIU LiuHong ZHOU ChuanMin SONG LiHong | 2008 | Science China Earth Sciences2008，51，9： | 29 |
| 2 | Association between Ambient Air Pollution and Hospital Emergency Admissions for Respiratory and Cardiovascular Diseases in Beijing: a Time Series Study显示文摘Objective To investigate the association between ambient air pollution and hospital emergency admissions in Beijing. Methods In this study, a semi-parametric generalized additive model(GAM) was used to evaluate the specific influences of air pollutants(PM10, SO2, and NO2) on hospital emergency admissions with different lag structures from 2009 to 2011, the sex and age specific influences of air pollution and the modifying effect of seasons on air pollution to analyze the possible interaction. Results It was found that a 10 μg/m3 increase in concentration of PM10 at lag 03 day, SO2 and NO2 at lag 0 day were associated with an increase of 0.88%, 0.76%, and 1.82% respectively in overall emergency admissions. A 10 μg/m3 increase in concentration of PM10, SO2 and NO2 at lag 5 day were associated with an increase of 1.39%, 1.56%, and 1.18% respectively in cardiovascular disease emergency admissions. For lag 02, a 10 μg/m3 increase in concentration of PM10, SO2 and NO2 were associated with 1.72%, 1.34%, and 2.57% increases respectively in respiratory disease emergency admissions. Conclusion This study further confirmed that short-term exposure to ambient air pollution was associated with increased risk of hospital emergency admissions in Beijing. | ZHANG Ying WANG Shi Gong MA Yu Xia SHANG Ke Zheng CHENG Yi Fan LI Xu NING Gui Cai ZHAO Wen Jing LI Nai Rong | 2015 | Biomedical and Environmental Sciences2015，28，5： | 18 |
| 3 | THE M/M/c QUEUE WITH PH SYNCHRONOUS VACATIONS显示文摘1.IntroductionRecently,singleserverqueueswithvacationshavebeenstudiedextensivelyfromtheirowntheoreticalinterestaswellastheirapplicationstomanyengineeringsystemssuchascomputers,communicationnetworksandmanufacturingsystems.FOrtheM/G/lqueueingsystemswit... | TIAN Nai shuo (Department of Mathematics, Yanshan University, Qinhuangdao 066004,China) LI Quan lin (National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100080, China) | 2000 | Systems Science and Mathematical Sciences2000，13，1： | 13 |
| 4 | Characteristics of Inconel Powders for Powder-Bed Additive Manufacturing显示文摘本研究中使用不同的粉末表征技术对铬镍铁合金的原始粉末和回收粉末在粉末床增材制造(AM)上的流动特性、行为特征进行研究。结果发现,选择性激光熔化(SLM)工艺的粒径分布(PSD)范围通常在15~63μm之间。原始的铬镍铁合粉末的流量约为28 s·(50 g)–1,组装密度是60%。流变测试结果表明,原始粉末与回收粉末相比具有更好的流动性。讨论了两种粉末之间的相互关系。运用铬镍铁合金粉末已经成功打印出了螺旋桨。实验结果表明铬镍铁合金粉末适用于增材制造(AM),本研究为生产增材制造粉末提供参考。 | Quy Bau Nguyen Mui Ling Sharon Nai Zhiguang Zhu Chen-Nan Sun Jun wei Wei Zhou | 2017 | Engineering2017，3，5： | 11 |
| 5 | 基于PFC2D的砂土原生各向异性微观机理数值试验显示文摘采用颗粒流PFC数值模拟方法,生成符合标准砂室内单元试验结果的离散元数值试验试样。运用重力沉积法建立不规则砂土颗粒单元的平面双轴试验模型,给定不同沉积步数对试样不同初始原生状态进行模拟,然后分别从水平和竖直方向上施加荷载增量,得到不同沉积条件下不同加载方向上砂土试样宏观应力应变曲线和力学参数。数值试验结果显示,重力沉积步数对颗粒微观长轴定向排列、平均配位数有显著影响;初步建立了砂土微观结构变化和宏观应力应变曲线及力学参数的联系;分析了砂土试样表现出的宏观原生各向异性力学特性与内部颗粒结构的关系。 | 张坤勇 李威 罗兴军 CHARKLEY Nai Frederick | 2017 | 岩土工程学报2017，39，3： | 10 |
| 6 | Integrative Regulation of Drought Escape through ABA-Dependent and -Independent Pathways in Rice显示文摘许多植物发展了干旱逃跑(DE ) 机制弄短他们的生命周期当面对水赤字条件时。当干旱忍耐强烈地被调查了时, DE 的基因、分子的机制留下逃犯。在这研究,我们发现在米饭开发的早阶段的低水赤字处理(LWT ) 能触发早 flowering 并且减少 tiller 数字。LWT 导致了 abscisic 酸(骆驼毛的织物) 的累积,它接着由同时地调整许多花相关的基因支持早 flowering 在轻感觉和生理节奏的钟上有反馈效果。而且,,一些包括 OsTOC1 , Ghd7 ,和 PhyB 的轻受体,生理节奏的部件,和花相关的基因被发现以一种骆驼毛的织物依赖者方式涉及 LWT 一些包括 OsGI 的另外的花相关的基因, OsELF3 , OsPRR37 ,并且 OsMADS50 涉及独立于骆驼毛的织物的 DE 的规定。另外,我们发现 strigolactones 和 OsTB1 在 LWT 下面涉及 tillering 抑制,它独立于在米饭的 flowering 小径。一起拿,我们的调查结果提供在米饭的 DE 被多重小径并列地在繁殖(flowering ) 期间调整的引人注目的证据开关。 | Hao Du Fei Huang Nai Wu Xianghua Li Honghong Hu Lizhong Xiong | 2018 | Molecular Plant2018，11，4： | 9 |
| 7 | Glycated Haemoglobin in Diagnosis of Diabetes Mellitus and Pre-diabetes among Middle-aged and Elderly Population:Shanghai Changfeng Study显示文摘Objective To investigate the optimal glycated haemoglobin (HbA1c) cut off points and evaluate the impact of HbA1c on diabetes and pre-diabetes in middle-aged and elderly population. Methods Subjects were recruited from Shanghai Changfeng Study. A total of 1 973 community-based participants (age≥45) without known diabetes underwent oral glucose tolerance test (OGTT) by using a 75-g oral glucose load and HbA1c was measured by using high performance liquid chromatography (HPLC). Subjects were classified as normal glucose tolerance (NGT), pre-diabetes(impaired glucose regulation, IGR) and new diagnosed diabetes (NDD) per 1999 WHO criteria. Two tests are compared with receiver operating characteristic curve (ROC). Results Among 1973 subjects, 271 (13.7%) were diagnosed as NDD and 474 (24.0%) as IGR by using OGTT. HbA1c was 5.7%±0.7% in this population. Use of 6.5% as the HbA1C cutoff point has sensitivity of 38.7% and specificity of 98.5%. We recommend 6.0% as a better cutoff value for diagnosis of diabetes in this population (AUC 0.829, 95% CI 0.798-0.860, P<0.001) with its sensitivity and specificity as 66.1% and 86.8%. For IGR, the results showed low sensitivity (44.9%) and specificity (66.7%) with an AUC of 0.571 for HbA1c when 5.8% was used as the cutoff point. Participants detected with HbA1c≥6.0% were associated with nearly the same metabolic characteristics, including body mass index (BMI), blood pressure, lipid profile and urine albumin-creatinine ratio (uACR) compared with diabetic subjects detected by OGTT. Conclusion The optimum HbA1c cutoff point for diabetes in our study population was lower than ADA criteria, and HbA1c may not be used to identify IGR. | MA Hui GAO Xin LIN Huan Dong HU Yu LI Xiao Ming GAO Jian ZHAO Nai Qing | 2013 | Biomedical and Environmental Sciences2013，26，3： | 8 |
| 8 | A new flavonoid with a benzoic acid substituent from Selaginella uncinata显示文摘6-(5-Carboxyl-2-methoxyphenyl )-apigenin (1 ) ,新 flavonoid,从 Selaginella uncinata (Desv ) 的 60% 乙醇摘录被孤立春天。它的结构被分光镜的方法建立。化合物 1 代表在 C-6 拥有一个安息香的酸取代者的 flavonoids 的第一个例子。 | Jun Xia Zheng Nai Li Wang Hao Gao Hong Wei Liu Hai Feng Chen Ming Fan Xin Sheng Yao | 2008 | Chinese Chemical Letters2008，19，9： | 8 |
| 9 | Raman characteristics of hydrocarbon and hydrocarbon inclusions显示文摘The Raman spectrograms of hydrocarbon standard samples show that: (1) the Raman spectrogram of normal paraffin has very strong peaks of methyl and methylene (from 2700 cm-1 to 2970 cm-1); (2) branch methyl has the particular peak of 748 cm-1±; (3) six cyclic has the particular peak of 804 cm-1±; (4) phenyl has two particular peaks of 988 cm-1± and 3058 cm-1± and the 988 cm-1± peak is stronger than the 3058 cm-1± peak; and (5) hexene has three alkenyl spectrum peaks of 1294 cm-1±, 1635 cm-1± and 2996 cm-1±, with the 1635 cm-1± peak being the strongest, showing that the number of carbon in hy-drocarbon does not affect its Raman spectrogram, and the hydrocarbon molecular structure and base groups affect its Raman spectrogram, the same hydrocarbons (such as normal paraffin) have the same Raman spectrogram; the types (such as CH4, C2H6, C3H8) and the content of hydrocarbon in oil inclu-sions are not estimated by their characteristic Raman peaks. According to the Raman spectrograms of hydrocarbon compositions, the Raman spectrogram of hydrocarbon inclusion can be divided into five types: saturated hydrocarbon Raman spectrogram, fluoresce Raman spectrogram, saturated hydro-carbon bitumen Raman spectrogram, bitumen Raman spectrogram, and ethane Raman spectrogram. And according to the characteristics of Raman spectrogram, hydrocarbon inclusions can be divided into five types: saturated hydrocarbon inclusion, less saturated hydrocarbon (oil or gas) inclusion, saturated hydrocarbon bitumen inclusion, bitumen inclusion, and methane water inclusion. | ZHANG Nai TIAN ZuoJi LENG YingYing WANG HuiTong SONG FuQing MENG JianHua | 2007 | Science China Earth Sciences2007，50，8： | 7 |
| 10 | Geomorphological Evolution Revealed by Aeolian Sedimentary Structure in Badain Jaran Desert on Alxa Plateau, Northwest China显示文摘The Badain Jaran Desert,located in the Alxa Plateau,Northwest China,features mega-dunes and a unique dune-lake alternation landscape.This paper presented the aeolian sediment structures of three representative dunes in the Badain Jaran Desert using ground-penetrating radar (GPR).We processed and analyzed the GPR data and investigated the feasibility of using integrated GPR and sedimentological data to reconstruct dunes structure,sedimentary environment and geomorphological evolution.The results show that the internal structures of star dune and transverse dune represent various stages of mega-dune evolution: the main deposition processes of mega-dune are similar to those of transverse dunes but have a more complicated mechanism of sand transport and deposition because of the superimposition of dunes;the upper section of the mega-dune has a structure similar to that of star dune,with vertical aggradations on top.Diffraction hyperbolae in the GPR profile indicates that the presence of ancient dunes characterized by calcareous cementation layers is involved in the maintenance of mega-dunes,and water levels,shown by continuous,sub-horizontal GPR reflections,are supposed to be closely related to mega-dunes and the interdune lakes.Outcrop of wet sand and horizontal stratifications on the GPR image indicate moisture potentials with different levels inside mega-dunes.The multiplex geomorphology in the Badain Jaran Desert is the result of global climatic undulation,the unique geographical location,the geological structural features,etc. | BAI Yang WANG Nai'ang LIAO Kongtai Patrick KLENK | 2011 | Chinese Geographical Science2011，21，3： | 6 |
| 11 | A new triterpenoid saponin from the roots of Ardisia crenata显示文摘新 triterpenoid saponin, 3-O-{-d-glucopyranosyl-(1 4 )-[-d-glucopyranosyl-(1 2 )]-- l-arabinopyranosyl }-16, 28-dihydroxyolean-12-en-30-oic 酸 30-O--d-glucopyranosyl 酉旨(ardisicrenoside N, 1 ) 和二已知的 saponins, ardisicrenoside C (2 ) 和 D (3 ) ,从 Ardisia crenata Sim 的根被孤立。他们的结构被阐明由广泛光谱分析和化学证据。Saponins 1 在 vitro 在 11.0 mol/L 和 22.1 mol/L 对 MCI-7 和 NCI-H460 癌症房间线显示出 cytotoxicity。 | Dai Lin Liu Xue Zhang Shu Ping Wang Nai Li Wang Xin Sheng Yao | 2011 | Chinese Chemical Letters2011，22，8： | 6 |
| 12 | Application of hybrid operating rooms for treating spinal dural arteriovenous fistula显示文摘BACKGROUND A hybrid operating room(hybrid-OR)is a surgical space that combines a conventional operating room with advanced medical imaging devices.AIM To explore and summarize the technical features and effectiveness of the application of a hybrid-OR in dealing with spinal dural arteriovenous fistulas(SDAVFs).METHODS Eleven patients with SDAVFs were treated with the use of a hybrid-OR at the Department of Neurosurgery of our hospital between January 2015 and December 2018.The dual-marker localization technique was used in the hybrid-OR to locate the SDAVFs and skin incision,and the interoperative digital subtraction angiography(DSA)technique was used before and after microsurgical ligation of the fistulae in the hybrid-OR to verify the accuracy of obliteration.The patients were followed for an average of 2 years after the operation,and the preoperative American Spinal Cord Injury Association(ASIA)score and postoperative ASIA score at 6 mo after the operation were compared.RESULTS The location and skin incision of the SDAVFs were accurately obtained by using the dual-marker localization technique in the hybrid-OR in all patients,and there were no cases that required expansion of the range of the bone window in order to expose the lesions.Intraoperative error obliteration occurred and was identified in two patients by using the intraoperative DSA technique;therefore,the findings provided by the intraoperative DSA system significantly changed the surgical procedure in these two patients.With the assistance of the hybrid-OR,the feeding artery was correctly ligated in all cases,and the intraoperative error obliteration rate decreased from 18.2%(2/11)to 0%.All 11 patients were followed for an average of 2 years.The ASIA score at 6 mo after the operation was significantly improved compared with the preoperative ASIA score,and there were no patients with late recurrence during the follow-up.CONCLUSION Compared with intra-arterial embolization for the treatment of SDAVFs,hybrid-ORs can solve the problem of a higher incidence of initial failure and late recurrence.Compared with direct occlusion of SDAVFs in microsurgery,hybrid-ORs can take advantage of the intraoperative DSA system for locating the shunt and verifying the obliteration of fistulae in order to reduce the error obliteration rate.At this point,our experience suggests that the safety and ease of use make hybrid-ORs combined with microsurgery and intraoperative DSA systems an attractive modality for dealing with SDAVFs. | Nai Zhang Wen-Qiang Xin | 2020 | World Journal of Clinical Cases2020，8，6： | 6 |
| 13 | Stable isotope analysis of water sources for Tamarix laxa in the mega-dunes of the Badain Jaran Desert, China显示文摘The complex interactions in desert ecosystems between functional types and environmental conditions could be reflected by plant water use patterns. However, the mechanisms underlying the water use patterns as well as the water sources of Tamarix laxa in the mega-dunes of the Badain Jaran Desert, China, remain unclear. This study investigated the water sources and water use patterns of T. laxa using the stable oxygen isotope method. The δ^(18)O values of xylem water, soil water in different layers(0–200 cm), rainwater, snow water, lake water, atmospheric water vapor, condensate water, and groundwater were measured. The sources of water used by T. laxa were determined using the IsoSource model. The results indicate that T. laxa mainly relies on soil water. At the beginning of the growing season(in May), the species is primarily dependent on water from the middle soil layer(60–120 cm) and deep soil layer(120–200 cm). However, it mainly absorbs water from the shallow soil layer(0–60 cm) as the rainy season commences. In September, water use of T. laxa reverts to the deep soil layer(120–200 cm). The water use patterns of T. laxa are closely linked with heavy precipitation events and soil water content. These findings reveal the drought resistance mechanisms of T. laxa and are of significance for screening species for ecological restoration. | ZHANG Jinhu WANG Nai'ang NIU Zhenmin SUN Jie DONG Chunyu ZHANG LyuLyu | 2018 | Journal of Arid Land2018，10，6： | 5 |
| 14 | In-situ Synthesis of ZSM-5 with Different Si/AlRatios on Honeycomb-shaped Cordierite and their Behavior on NO Decomposition显示文摘Zeolites ZSM-5 with different Si/Al ratios were in-situ synthesized on the surface ofhoneycomb-shaped cordierite support for the first time. Characterizations of XRD and SEM wereperformed and it has been proved that the zeolite ZSM-5 was grown on the surface of the cordieritehomogeneously. NO decomposition on the Cu exchanged ZSM-5/cordierite monolith catalysts wasalso studied. It was found that the monolith catalysts have a fine initial activity at 673K and GHSVof 10,000h-1. Such method should be a good way to make auto exhaust converter with monolithcatalyst for NOx removal. | Xue Lei SHAN Nai Jia GUAN Xiang ZENG Shou He XIANG(ICM, Department of Chemistry, Nankai University, Tianjin 300071) | 1999 | Chinese Chemical Letters1999，10，10： | 5 |
| 15 | Crystallization,Mechanical,Thermal and Rheological Properties of Polypropylene Composites Reinforced by Magnesium Oxysulfate Whisker显示文摘Polypropylene(PP) composites containing magnesium oxysulfate whisker(MOSw) or lauric acid(LA) modified MOSw(LAMOSw) were prepared via melt mixing in a torque rheometer. The heterogeneous nucleating effect of LAMOSw was clearly observed in polarized light microscopy(PLM) pictures with the presence of an abundance of small spherulites. MOSw exhibited no nucleation effect and formed a few spherulites with large size. Compared with PP/MOSw composites, PP/LAMOSw exhibited better impact strength, tensile strength and nominal strain at break, ascribing to three possible reasons:(i) more β-crystal PP formed,(ii) better dispersity of LAMOSw in PP matrix and(iii) the plasticizing effect of LA. The results of dynamic mechanical thermal analysis(DMTA) indicated that brittleness of the PP matrix at low temperature was improved by the addition of LAMOSw, while the interfacial interactions between MOSw and PP matrix were actually weakened by LA, as evidenced by the higher tanδ values over the entire range of test temperatures. In terms of the rheological properties of the composites, both the η* and G′ at low frequencies increase with the addition of MOSw or LAMOSw, indicating that the PP matrix was transformed from liquid-like to solid-like. However, a network of whiskers did not form because no plateau was found in the G′ at low frequencies. With low filler content, LAMOSw produced a stronger solid-like behavior than MOSw mainly due to the better dispersion of the LAMOSw in PP matrix. However, for highly-filled composites, the η* of PP/LAMOSw at low frequencies was smaller than that of PP/MOSw composite, since the particleparticle contact effect played a major role. | Li Dang Xue-ying Nai Xin Liu Dong-hai Zhu Ya-ping Dong 李武 | 2017 | Chinese Journal of Polymer Science2017，35，5： | 4 |
| 16 | Current status of human adenovirus infection in China显示文摘Background Outbreaks of severe,acute hepatitis among children have recently attracted global attention.The pathogen causing the outbreak remains unknown,but there is growing evidence that it may be associated with human adenovirus(HAdV).Data sources A review of adenovirus-related clinical studies,epidemiological studies,etiological studies,and case reports was conducted by reviewers independently.Results HAdV can cause a wide variety of clinical symptoms.In the Mainland of China,HAdV infection accounts for 5.8%–13%of patients with acute respiratory infections,and these infections are mainly caused by species B,C,and E of HAdV.For acute conjunctivitis,39.8%–74.9%of sporadic cases were infected by B and D species of HAdV.Outbreaks of keratoconjunctivitis and pharyngoconjunctival fever related to HAdV infection could be found throughout the country.In pediatric patients with acute gastroenteritis,HAdV-41 was the predominant HAdV type,followed by HAdV species B and C.Several types of HAdV,including HAdV-5,HAdV-7,HAdV-1,and HAdV-2,have previously been reported as potential pathogens associated with HAdV hepatitis in immunocompromised patients.However,few HAdV-related hepatitis cases have been reported in China to date.Conclusions There are no systematic surveillance and clinical studies on HAdV hepatitis in China.Therefore,it is imperative to establish a nationwide HAdV virological surveillance system to collect relevant clinical,epidemiological and virological surveillance data and risk factor information as soon as possible to assess the potential risk of HAdV hepatitis among children. | Nai‑Ying Mao Zhen Zhu Yan Zhang Wen‑Bo Xu | 2022 | World Journal of Pediatrics2022，18，8： | 4 |
| 17 | The setereoselective preparation ofβ-keto esters using baker's yeast in the presence of rice wine koji显示文摘由米饭酒 koji 的增加,反应的改进与高 enantiomeric 纯净为β - keto 酉旨的发面酵母减小被观察进(S)- β -hydroxy 酉旨(73 98%) 。 | Jin Cui Ming Jie Zhang Xiang Qian Wang Nai Jing Cui | 2008 | Chinese Chemical Letters2008，19，3： | 4 |
| 18 | Effects of Low Concentrations of Di-(2-ethylhexyl) and Mono-(2-ethylhexyl) Phthalate on Steroidogenesis Pathways and Apoptosis in the Murine Leydig Tumor Cell Line MLTC-1显示文摘这研究的目的是在 vitro 在一根鼠科的 Leydig 肿瘤房间线(MLTC-1 ) 在 steroidogenesis 上评估 DEHP 和 MEHP 的低集中的效果。流动 cytometry 分析的结果表明 apoptotic 房间的比例显著地在暴露以后被增加到 DEHP。所有三基因(P450scc, P450c17,并且 3 ? HSD ) 在学习下面显示出增加的表达式追随者暴露到 DEHP 或 MEHP,尽管一些不足道的禁止的效果出现了在 10 ? mol/L 处理组同样与控制相比。它也被发现那 DEHP 或 MEHP 在特别刺激了 INSL3 mRNA 和蛋白质 0.001 ? mol/L 处理组。睾丸激素分泌物在暴露以后被刺激到 DEHP 或 MEHP。在 MLTC-1 房间的 steroidogenic 酶和 INSL3 的改变可能在雄激素生产上涉及 DEHP/MEHP 的 biphasic 效果。 | CHEN Xi LIU Ya Nan ZHOU Qing Hong LENG Ling CHANG Ying TANG Nai Jun | 2013 | Biomedical and Environmental Sciences2013，26，12： | 4 |
| 19 | nm23 expression in gastric carcinoma and its relationship with lymphoproliferation显示文摘Tumorspreadisacomplexbiologicalprocescloselyrelatedtotumorgrowth,whichisregulatedbymanygeneswithinthecel.Recentstudieshavere?.. | WANG Yang Kun 1, JI Xiao Long 2 and MA Nai Xu 1 | 1999 | World Journal of Gastroenterology1999，5，1： | 4 |
| 20 | 土体三维卸荷弹塑性模型及其试验验证显示文摘天然土体经历开挖卸荷应力路径后,其应力变形特性与常规加载应力路径条件下规律存在较大差异。目前常用土体本构模型大多建立在等向固结单向加载三轴试验基础上,没有考虑初始K_0固结和开挖卸荷应力路径的影响。以剑桥模型为基础,借鉴关口-太田模型的建模思想,通过引入新的应力比参数,对p-q平面上屈服轨迹硬化轴进行旋转,调整弹性区范围,以反映初始K_0固结的影响;再运用变换应力法将模型三维化处理,从而使模型可以描述土体三向不等向应力状态,最终得到一个能综合反映土体K_0固结开挖卸荷应力-应变特性的三维弹塑性本构模型。通过和典型室内应力路径试验结果进行对比,验证了模型的合理性。 | 张坤勇 臧振君 李威 文德宝 Charkley Frederick Nai | 2019 | 岩土力学2019，40，4： | 4 |
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