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| 1 | Risk evaluation of rock burst through theory of static and dynamic stresses superposition显示文摘Rock burst is one of the most catastrophic dynamic hazards in coal mining. A static and dynamic stresses superposition-based(SDSS-based) risk evaluation method of rock burst was proposed to pre-evaluate rock burst risk. Theoretical basis of this method is the stress criterion incurring rock burst and rock burst risk is evaluated according to the closeness degree of the total stress(due to the superposition of static stress in the coal and dynamic stress induced by tremors) with the critical stress. In addition, risk evaluation criterion of rock burst was established by defining the 'Satisfaction Degree' of static stress. Furthermore,the method was used to pre-evaluate rock burst risk degree and prejudge endangered area of an insular longwall face in Nanshan Coal Mine in China. Results show that rock burst risk is moderate at advance extent of 97 m, strong at advance extent of 97-131 m,and extremely strong(i.e. inevitable to occur) when advance extent exceeds 131 m(mining is prohibited in this case). The section of two gateways whose floor abuts 15-3 coal seam is a susceptible area prone to rock burst. Evaluation results were further compared with rock bursts and tremors detected by microseismic monitoring. Comparison results indicate that evaluation results are consistent with microseismic monitoring, which proves the method's feasibility. | 李振雷 窦林名 王桂峰 蔡武 何江 丁言露 | 2015 | Journal of Central South University2015，22，2： | 22 |
| 2 | 矿震扰动下采区煤柱应力偏量集中区诱冲机制及防治方法显示文摘以张双楼矿西一采区生产地质条件为工程背景,基于应力偏量、等效应力、Mises强度准则、能量释放速率分析了煤岩冲击失稳的充要判别准则,揭示了采区煤柱覆岩结构、应力偏量、矿震事件随工作面回采演化规律,并探讨了矿震扰动下采区煤柱冲击危险防治方法.结果表明:煤岩冲击失稳充要条件为开采活动及矿震扰动引起的应力偏量超过煤岩体强度极限,且单位时间内煤岩系统释放弹性能量与矿震应力波输入能量之和大于煤岩系统稳态破坏消耗能量;随着采区工作面持续开采,采区煤柱两侧覆岩形成'T'型悬臂结构并不断损伤破坏;以标量应力偏量第二不变量J2表征应力偏量σ′_(ij),煤柱区应力偏量前期呈'M'型分布并逐渐向单峰型转变,屈服破坏区逐渐向煤柱中部扩展;以矿震频次、能量、震源位置表征应力波扰动σ_(ij)~d,矿震扰动以低能量事件为主,且主要集中于正回采工作面及采区煤柱区域.根据分析结果,提出矿震扰动下采区煤柱切顶爆破、扩大采区煤柱宽度、跨上山开采、大直径钻孔卸压等防冲方法. | 王浩 赵毅鑫 牟宗龙 焦振华 张旭 卢志国 | 2017 | 中国矿业大学学报2017，46，6： | 14 |
| 3 | 高位硬厚岩层弹性基础边界下破断规律的演化特征显示文摘以某矿首采工作面上覆高位岩浆岩条件为背景,根据高位硬厚岩层的空间结构及边界基础特征,建立了高位硬厚岩层弹性基础支承下的Winkler基础正交梁力学模型,推导出高位硬厚岩层走向和倾向的弯矩及挠度表达式,得到了特征弯矩及其位置的计算式,分析了特征弯矩在工作面推进过程中的演化规律.研究表明:高位硬厚岩层在边界基础支承下,走向及倾向的最大弯矩和起始破断位置在采空区中部,具有边界基础变形效应.初次破断步距随工作面长度的增加呈现似'W'型变化趋势,并分为稳定、步距变化和步距稳定3个阶段;随弹性基础特征参数β的增大呈现单调递增的变化趋势.采用弹性基础正交梁理论可预测高位硬厚岩层的破断步距,并通过工程实例验证了考虑边界弹性基础变形效应是合理的. | 蒋金泉 王普 武泉林 张培鹏 | 2016 | 中国矿业大学学报2016，45，3： | 11 |
| 4 | Characteristics of deformation and stress distribution of small coa pillars under leading abutment pressure显示文摘Based on the engineering project on a small coal pillar of 12,521 working face roadway in Xieqiao Coalmine, data regarding surface displacements of the coal pillar, deep displacements and mining stress have been collected and analyzed. The results show that macroscopic transverse fractures of the inner coal pillar are developed within 2–4 m of the roadway surface, which is located outside the coal pillar anchorage zone. There is a displacement of 530 mm at the monitoring point in the 6 m deep zone of the pillar. Transfer of the fracture zone is found in a small coal pillar and the fractures within 3–4 m of the coal-rock zone from the roadway surface undergo propagation and closure of cracks which means this fracture zone is transferred from 3–4 m outside the roadway to only 2–3 m from the roadway surface. In the monitoring zone, vertical and horizontal stresses increase with a feature that shows that acceleration in the deep zone of the pillar is greater than that in the shallow zone. Furthermore, the acceleration of vertical stress is also greater than that of horizontal stress with a peak value in the 4 m zone.The research findings provide a reference for the regulation of a reasonable width of coal pillar in coalmines and optimal control design of surrounding rock. | Wu Hai Zhang Nong Wang Weijun Zhao Yiming Cao Peng | 2015 | International Journal of Mining Science and Technology2015，25，6： | 6 |
| 5 | 煤体压剪破裂震源模型及远场震动特征显示文摘为了研究工作面煤体破裂造成的震动破坏效应,根据位错震源理论与动态断裂力学,建立了煤体压剪破裂震源模型,推导了煤体压剪破裂引起的震动位移场远场表达式.数值计算结果表明:随着煤体破裂速度的升高,远场P波、SH波和SV波的振幅逐渐增大.震动位移场远场空间分布特征显示P波分量主要集中在与破裂面成45°夹角的平面内,SH波和SV波分量主要集中在破裂面及其正交面内.在平行和垂直于破裂面的传播方向上,P波的衰减速度大于SH波和SV波且幅值小于SH波和SV波.工程实践中,需要注意防范P波对工作面巷帮造成层裂破坏和SH波、SV波对工作面两巷与顶底板结合处造成剪切破坏. | 冯俊军 王恩元 沈荣喜 陈亮 李学龙 李楠 | 2016 | 中国矿业大学学报2016，45，3： | 5 |
| 6 | Dynamic failure risk of coal pillar formed by irregular shape longwall face:A case study显示文摘Irregular shape workface would result in the presence of coal pillar, which leads to high stress concentration and possibly induces coal bumps. In order to study the coal bump mechanism of pillars, static and dynamic stress overlapping(SDSO) method was proposed to explain the impacts of static stress concentration and tremors induced by mining activities. The stress and deformation in surrounding rock of mining face were analyzed based on the field case study at 1303 workface in Zhaolou Coal Mine in China.The results illustrate that the surrounding rock of a workface could be divided into four different zones,i.e., residual stress zone, stress decrease zone, stress increase zone and original stress zone. The stress increase zone is prone to failure under the SDSO impact loading conditions and will provide elastic energy for inducing coal bump. Based on the numerical modelling results, the evolution of static stress in coal pillar as the size of gob increasing was studied, and the impact of dynamic stress was investigated through analyzing the characteristics of tremor activities. The numerical results demonstrate the peak value of vertical stress in coal pillar rises from about 30 MPa with mining distance 10 m to 52.6 MPa with mining distance 120 m, and the location of peak stress transfers to the inner zone of coal pillars as the workface moves forward. For the daily tremor activities, tremors with high energy released indicate high dynamic stress disturbance on the surrounding rock, therefore, the impact of dynamic stressing is more serious during workface extension period because the tremor frequency and average energy after workface extension are higher than those before the workface extension. | Yixin Zhao Hao Wang Shimin Liu Zonglong Mu Zhiguo Lu | 2018 | International Journal of Mining Science and Technology2018，28，5： | 3 |
| 7 | The influence of borehole arrangement of soundless cracking demolition agents(SCDAs)on weakening the hard rock显示文摘The hard roof difficult to collapse easily causes gas accumulation,which threatens the production safety of coal mine.Therefore,roof pre-cracking is required.Although blasting and hydraulic fracturing can also crack the roof,blasting can easily induce rock bursts,whereas hydraulic fracturing needs complex equipment.In contrast,soundless cracking demolition agents(SCDAs)with noise-free,dust-free,and safe characteristics have obvious advantages.The main component of SCDA is calcium oxide,which reacts with water to produce higher expansion pressure.In this paper,focused on the angles of the borehole,the effect of SCDA is analyzed by numerical simulation based on Pingdingshan coal mine.The research results showed that the azimuthal angle a(between borehole projection and the roadway direction)does not significantly affect the efficacy of SCDAs,whereas the influence of borehole elevation angle b is far more significant than that of the azimuthal angle.Therefore,the angle b is a dominant factor influencing the effect of SCDAs.Based on different effects of SCDAs at different angle of boreholes,the weakening unit was established,so the SCDAs could give full play to roof fracturing.Moreover,field tests validated the importance of borehole angle on weakening the hard roofs. | Wei Tang Cheng Zhai Jizhao Xu Yong Sun Yuzhou Cong Yangfeng Zheng | 2021 | International Journal of Mining Science and Technology2021，31，2： | 2 |
| 8 | Fracture mechanics solution of confined water progressive intrusion height of mining fracture floor显示文摘In order to obtain the value of confined water progressive intrusion height of mining fracture floor, the analysis equation was deduced based on the fracture extension theory of the fracture mechanics. Furthermore, the influence of some parameters(e.g., advancing distance of working face, water pressure, initial fracture length and its angle) on confined water progressive intrusion height were analyzed. The results indicate that tension-shearing fracture of floor is extended more easily than compression-shearing fracture under the same conditions. When floor fracture dip angle is less than 90°, tension-shearing extension occurs more easily on the left edge of the goaf. If fracture dip angle is larger than 90°, it occurs more easily on the right edge of the goaf. The longer the advancing distance of working face is, the greater initial fracture length goes; or the larger water pressure is, the greater possibility of tension-shearing extension occurs. The confined water progressive intrusion height reaches the maximum on the edge of the goaf.Field in situ test is consistent with the theoretical analysis result. | Lu Haifeng Yao Duoxi Shen Dan Cao Jiyang | 2015 | International Journal of Mining Science and Technology2015，25，1： | 2 |
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