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| 1 | Accumulative deformation in railway track induced by high-speed traffic loading of the trains显示文摘Prediction and control of the permanent settlement of a track caused by traffic loading from trains is crucial to high-speed railway design and maintenance.In this study, a unified prediction model of accumulative deformation of geomaterials used in railway construction subjected to cyclic loadings is introduced and calibrated using physical model testing.Based on this versatile model, a calculation approach to determine the track structure settlement under repeated loadings caused by the movement of the wheel axle of the train is proposed.Regression analysis on the physical model testing is adopted to determine the parameters involved in the computational approach.Comparison of model test data and computed results shows that the parameters obtained from the back-analysis are consistent throughout the various testing conditions, and the proposed calculation approach is capable of satisfactorily predicting the accumulative settlement of the railway roadbed and subgrade soil for various axle loads and loading cycles.A case study of a high-speed railway is performed to demonstrate the feasibility of the proposed approach in realistic engineering applications.The computation results from the settlement development of a roadbed and subgrade soil are presented and discussed. | Bian Xuecheng Jiang Hongguang Chen Yunmin | 2010 | Earthquake Engineering and Engineering Vibration2010，9，3： | 16 |
| 2 | Numerical simulation of high-speed train induced ground vibrations using 2.5D finite element approach显示文摘An efficient 2.5D finite element numerical modeling approach was developed to simulate wave motions generated in ground by high-speed train passages. Fourier transform with respect to the coordinate in the track direction was applied to re-ducing the three-dimensional dynamic problem to a plane strain problem which has been solved in a section perpendicular to the track direction. In this study, the track structure and supporting ballast layer were simplified as a composite Euler beam resting on the ground surface, while the ground with complicated geometry and physical properties was modeled by 2.5D quadrilateral elements. Wave dissipation into the far field was dealt with the transmitting boundary constructed with fre-quency-dependent dashpots. Three-dimensional responses of track structure and ground were obtained from the wavenumber expansion in the track direction. The simulated wave motions in ground were interpreted for train moving loads traveling at speeds below or above the critical velocity of a specific track-ground system. It is found that, in the soft ground area, the high-speed train operations can enter the transonic range, which can lead to resonances of the track structure and the sup-porting ground. The strong vibration will endanger the safe operations of high-speed train and accelerate the deterioration of railway structure. | BIAN XueCheng CHEN YunMin HU Ting | 2008 | Science China(Physics,Mechanics & Astronomy)2008，51，6： | 9 |
| 3 | Engineering properties for high kitchen waste content municipal solid waste显示文摘Engineering properties of municipal solid waste(MSW) depend largely on the waste's initial composition and degree of degradation.MSWs in developing countries usually have a high kitchen waste content(called HKWC MSW).After comparing and analyzing the laboratory and field test results of physical composition,hydraulic properties,gas generation and gas permeability,and mechanical properties for HKWC MSW and low kitchen waste content MSW(called LKWC MSW),the following findings were obtained:(1) HKWC MSW has a higher initial water content(IWC) than LKWC MSW,but the field capacities of decomposed HKWC and LKWC MSWs are similar;(2) the hydraulic conductivity and gas permeability for HKWC MSW are both an order of magnitude smaller than those for LKWC MSW;(3)compared with LKWC MSW,HKWC MSW has a higher landfill gas(LFG) generation rate but a shorter duration and a lower potential capacity;(4) the primary compression feature for decomposed HKWC MSW is similar to that of decomposed LKWC MSW,but the compression induced by degradation of HKWC MSW is greater than that of LKWC MSW;and(5) the shear strength of HKWC MSW changes significantly with time and strain.Based on the differences of engineering properties between these two kinds of MSWs,the geo-environmental issues in HKWC MSW landfills were analyzed,including high leachate production,high leachate mounds,low LFG collection efficiency,large settlement and slope stability problem,and corresponding advice for the management and design of HKWC MSW landfills was recommended. | Wu Gao Yunmin Chen Liangtong Zhan Xuecheng Bian | 2015 | Journal of Rock Mechanics and Geotechnical Engineering2015，7，6： | 6 |
| 4 | Experimental study on dynamic load magnification factor for ballastless track-subgrade of high-speed railway显示文摘The magnitude of dynamic load produced by high-speed trains depends on many factors,of which train speed is the most critical one.However,it is quite difficult to determine the effect of train speed on dynamic load using the theoretical methods due to the complexity of the interaction between vehicle and track-subgrade.Thus large-scale model test has gradually become an important approach for studying dynamic responses of ballastless track-subgrade of high-speed railway.In this study,a full-scale model of ballastless track-subgrade was constructed in accordance with the design and construction standards for Shanghai-Nanjing intercity high-speed railway line firstly.Then,the dynamic strain of slab and the dynamic earth pressure of subgrade were measured by conducting single wheel axle excitation test.In addition,the relationship between the dynamic load magnification factor(DLF) and the train speed was obtained.Finally,the DLF of track-subgrade under different train speeds was proposed,similar to that given by German Railway Standard. | Renpeng Chen Xing Zhao Zuozhou Wang Hongguang Jiang Xuecheng Bian | 2013 | Journal of Rock Mechanics and Geotechnical Engineering2013，5，4： | 5 |
| 5 | Utilizing phase-shifted long-period fiber grating to suppress spectral broadening of a high-power fiber MOPA laser system显示文摘Suppressing nonlinear effects in high-power fiber lasers based on fiber gratings has become a hotspot.At present,research is mainly focused on suppressing stimulated Raman scattering in a high-power fiber laser.However,the suppression of spectral broadening,caused by self-phase modulation or four-wave mixing,is still a challenging attribute to the close distance between the broadened laser and signal laser.If using a traditional fiber grating with only one stopband to suppress the spectral broadening,the signal power will be stripped simultaneously.Confronting this challenge,we propose a novel method based on phase-shifted long-period fiber grating(PS-LPFG)to suppress spectral broadening in a high-power fiber master oscillator power amplifier(MOPA)laser system in this paper.A PS-LPFG is designed and fabricated on 10/130 passive fiber utilizing a point-by-point scanning technique.The resonant wavelength of the fabricated PS-LPFG is 1080 nm,the full width at half maximum of the passband is 5.48 nm,and stopband extinction exceeds 90%.To evaluate the performance of the PS-LPFG,the grating is inserted into the seed of a kilowattlevel continuous-wave MOPA system.Experiment results show that the 30 dB linewidth of the output spectrum is narrowed by approximately 37.97%,providing an effective and flexible way for optimizing the output linewidth of highpower fiber MOPA laser systems. | Yinxu Bian Kerong Jiao Xuecheng Wu Hua Shen Feiyan Yang Rihong Zhu | 2021 | High Power Laser Science and Engineering2021，9，3： | 2 |
| 6 | An explicit time domain solution for ground stratum response to harmonic moving load显示文摘基于原来在频率领域建议的薄层方法,明确的时间域半分析答案为模仿三维的分层的地面回答到泛音移动被开发了负担。Fourier Laplace 变换被使用导出满足了水平无穷的边界条件的转变答案。特征值分解关于 Laplace 参数被执行表示相应于 eigenmodes 的扎根的运动。为合并动人的负担表达式的每 eigenmode 的明确的表达回来被转变成时间域经分解,并且全球系统回答借助于一般模式重叠方法被给。建议明确的时间领域答案对学习动人的负担作用于或在地面内的各种各样的类型合适。在这篇论文,有矩形的分发的动人的泛音负担被采用表明扎根的反应模拟。为有在以上下面的速度的动人的负担的二个解说性的例子扎根的瑞利波浪速度被介绍测试建议途径的计算精确性和效率。参量的研究也被执行在扎根的回答上调查土壤性质的影响。 | Xuecheng Bian Yunmin Chen | 2006 | Acta Mechanica Sinica2006，22，5： | 2 |
| 7 | Mud pumping in high‑speed railway:in‑situ soil core test and full‑scale model testing显示文摘Mud pumping induced by moving train loads on rainwater-intruded roadbed causes intensive track vibrations and threatens safety of high-speed trains.In this paper,a vehicle–track–subgrade finite element model was established to analyze the dynamic responses of a ballastless track,and results showed that the concrete base and roadbed were detached because of the whipping effect arising from the rainwater intrusion channel.An in-situ soil core test showed that the intruded rainwater accumulated in roadbed to form standing water and saturated the roadbed.The flapping action of the concrete base caused by the whipping effect led to mud formation mixed with fine particles and rainwater,which migrated upward under the pore-water pressure(PWP)gradient.Mud pumping resulted from continuous particle migration in the saturated roadbed under moving train loads:under normal roadbed condition,coarse and fine particles were uniformly distributed in the roadbed;in early period of mud pumping,fine particles migrated downward to bottom of the roadbed because of the rainwater infiltration flow;in middle stage of mud pumping,fine particles migrated upward and gathered at the roadbed surface under PWP gradient;in later period of mud pumping,fine particles were entrained and removed with the dissipation of excess PWP.Moreover,a full-scale physical model was established to reproduce mud pumping,and polyurethane injection remediation against mud pumping was validated on this physical model.The remediation method was applied to an in-situ mud pumping.The deviation of the vertical track profile reduced remarkably and remained at a low level within half a year,showing a good long-term service performance of the polyurethane remediated roadbed. | Zhangbo Wan Xuecheng Bian Yunmin Chen | 2022 | Railway Engineering Science2022，30，3： | 1 |
| 8 | Substructure simulation of inhomogeneous track and layered ground dynamic interaction under train passage 显示文摘 | Takemiya H Bian Xuecheng | 2005 | Journal of Engineering Mechanics ASCE2005，131，7： | 1 |
| 9 | Image-Aided Analysis of Ballast Particle Movement Along a High-Speed Railway显示文摘As a core infrastructure of high-speed railways,ballast layers constituted by graded crushed stones feature noteworthy particle movement compared with normal railways,which may cause excessive settlement and have detrimental effects on train operation.However,the movement behavior remains ambiguous due to a lack of effective measurement approaches and analytical methods.In this study,an image-aided technique was developed in a full-scale model test using digital cameras and a colorbased identification approach.A total of 1274 surface ballast particles were manually dyed by discernible colors to serve as tracers in the test.The movements of the surface ballast particles were tracked using the varied pixels displaying tracers in the photos that were intermittently taken during the test in the perpendicular direction.The movement behavior of ballast particles under different combinations of train speeds and axle loads was quantitatively evaluated.The obtained results indicated that the surface ballast particle movements were slight,mainly concentrated near sleepers under low-speed train loads and greatly amplified and extended to the whole surface when the train speed reached 360 km.h-1.Additionally,the development of ballast particle displacement statistically resembled its rotation.Track vibration contributed to the movements of ballast particles,which specifically were driven by vertical acceleration near the track center and horizontal acceleration at the track edge.Furthermore,the development trends of ballast particle movements and track settlement under long-term train loading were similar,and both stabilized at nearly the same time.The track performance,including the vibration characteristics,accumulated settlement,and sleeper support stiffness,was determined to be closely related to the direction and distribution of ballast particle flow,which partly deteriorated under high-speed train loads. | Xuecheng Bian Wenqing Cai Zheng Luo Chuang Zhao Yunmin Chen | 2023 | Engineering2023，，8： | 0 |
| 10 | Soil disturbance evaluation of soft clay based on stress-normalized smallstrain stiffness显示文摘Soil disturbance includes the change of stress state and the damage of soil structure.The field testing indices reflect the combined effect of both changes and it is difficult to identify the soil structure disturbance directly from these indices.In the present study,the small-strain shear modulus is used to characterize soil structure disturbance by normalizing the effective stress and void ratio based on Hardin equation.The procedure for evaluating soil sampling disturbance in the field and the further disturbance during the subsequent consolidation process in laboratory test is proposed,and then validated by a case study of soft clay ground.Downhole seismic testing in the field,portable piezoelectric bender elements for the drilled sample and bender elements in triaxial apparatus for the consolidated sample were used to monitor the shear wave velocity of the soil from intact to disturbed and even remolded states.It is found that soil sampling disturbance degree by conventional thin-wall sampler is about 30%according to the proposed procedure,which is slightly higher than that from the modified volume compression method proposed by Hong and Onitsuka(1998).And the additional soil disturbance induced by consolidation in laboratory could reach about 50%when the consolidation pressure is far beyond the structural yield stress,and it follows the plastic volumetric strain quite well. | Yanguo Zhou Yu Tian Junneng Ye Xuecheng Bian Yunmin Chen | 2024 | Journal of Rock Mechanics and Geotechnical Engineering2024，16，3： | 0 |
| 11 | Impact of extreme climate and train traffic loads on the performance of high-speed railway geotechnical infrastructures显示文摘High-speed railways are very important in global transportation.However,the railway subgrade is significantly affected by the environment due to its exposure to the atmosphere.At present,global warming is the primary trend in world climate change and seriously damages railway infrastructure.Owing to the coupling effect of extreme environmental and train loads,various subgrade problems tend to arise,such as settlement,ballast fouling,and mud pumping,thus inducing frequent railway accidents and reducing travel safety.Insights into the problems triggered by extreme climate and train loads are critical to the design and long-term operation of high-speed railway subgrades.This study therefore presents a detailed survey of recent advances in typical subgrade problems through analyzing the problem formation mechanisms and influences.Traditional and emerging detection/monitoring technologies in respect of subgrade problems are discussed in detail,as well as pre-accident and post-accident maintenance methods.Finally,according to the existing challenges in long-term subgrade shakedown assessment,an outlook on open opportunities is provided for future research. | Ying WU Haoran FU Xuecheng BIAN Yunmin CHEN | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
| 12 | A substructure approach for analyzing pile foundation and soil vibrations due to train running over viaduct and its validation显示文摘An efficient computational approach based on substructure methodology is proposed to analyze the viaduct-pile foundation-soil dynamic interaction under train loads.Thetrain-viaductsubsystemissolvedusingthe dynamic stiffness integration method,and its accuracy is verified by the existing analytical solution for a moving vehicle on a simply supported beam.For the pile foundation-soil subsystem,the geometric and material properties of piles and soils are assumed to be invariable along the azimuth direction.By introducing the equivalent stiffness of grouped piles,the governing equations of pile foundation-soil interaction are simplified based on Fourier decomposition method,so the three-dimensional problem is decomposedintoseveraltwo-dimensionalaxisymmetricfinite element models.The pile foundation-soil interaction model is verified by field measurements due to shaker loading at pile foundation top.In addition,these two substructures are coupled with the displacement compatibility condition at interface of pier bottom and pile foundation top.Finally,the proposed train-viaduct-pile foundation-soil interaction model was validated by field tests.The results show that the proposed model can predict vibrations of pile foundation and soil accurately,thereby providing a basis for the prediction of pile-soil foundation settlement.The frequency spectra of the vibration in Beijing-Tianjin high-speed railway demonstrated that the main frequencies of the pier top and ground surface are below 100 and 30 Hz,respectively. | Ying Wu Xuecheng Bian Chong Cheng Jianqun Jiang | 2022 | Railway Engineering Science2022，30，4： | 0 |
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