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Post-failure analysis of landslides in spatially varying soil deposits using stochastic material point method

岩土力学 2022年第7期43卷 2003-2014页

作者：马国涛 REZANIA Mohammad mousavi nezhad mohaddeseh SHI Bu-tao School of Engineering University of WarwickCoventryUnited Kingdom China Longyuan Power Group Corporation Ltd BeijingChina

This paper presents the probabilistic analysis of landslides in spatially variable soil deposits, modeled by a stochastic framework which integrates the random field theory with generalized interpolation material point method(GIMP). Random fields are simulated using Cholesky matrix decomposition(CMD) method and Latin hypercube sampling(LHS) method, which represent material properties discretized into sets of random soil shear strength variables with statistical properties. The approach is applied to landslides in clayey deposits under undrained conditions with random fields of undrained shear strength parameters, in order to quantify the uncertainties of post-failure behavior at different scales of fluctuation(SOF) and coefficients of variation(COV). Results show that the employed approach can reliably simulate the whole landslide process and assess the uncertainties of runout motions. It is demonstrated that the natural heterogeneity of shear strength in landslides notably influences their post-failure behavior. Compared with a homogeneous landslide model which yields conservative results and underestimation of the risks, consideration of heterogeneity shows larger landslide influence zones. With SOF values increasing, the variances of influence zones also increase, and with higher values of COV, the mean values of the influence zone also increase, resulting in higher uncertainties of post-failure behavior.

关键词： probabilistic analysis random fields Latin hypercube sampling landslides

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Rock Dynamic Crack Propagation Behaviour and Determination Method with Improved Single Cleavage Semi-circle Specimen Under Impact Loads

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Acta Mechanica Solida Sinica 2020年第6期33卷 793-811页

作者： Fei Wang Meng Wang Zheming Zhu Jianhui Deng mohaddeseh mousavi nezhad Hao Qiu Peng Ying Failure Mechanics&Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan ProvinceSichuan UniversityChengdu 610065China Key Laboratory of Deep Underground Science and Engineering(Sichuan University) Ministry of EducationChengdu 610065China School of Engineering The University of WarwickCoventry CV47ALUK

This paper studied the rock dynamic fracture propagation under impact loads elaborately with a determination method proposed to calculate crack propagation dynamic stress intensity factor(DSIF).By utilizing the split-Hopkinson pressure bar,the impact experiments with an improved single cleavage semi-circle(ISCSC)specimen were conducted to illuminate the dynamic crack propagation ***,the fracture characteristics and crack propagation velocity were obtained by the crack propagation *** experiments with a numerical approach,the crack propagation dynamic stress intensity factors were calculated by an experimental—numerical method with fractal ***,a finite difference model was developed based on the tensile fracture softening damage *** the analysis of numerical and experimental results,the crack propagation behaviour and mechanism of crack arrest were discussed *** results demonstrate that the novel ISCSC specimen shows a definite advantage in determining crack propagation and arrest ***,the crack arrest DSIF is larger than the average propagation DSIF with a sharp ***,the numerical simulation results which agree well with the actual crack propagation illustrate that the crack arrest should be dominated by the compressive stress perpendicular to the crack path,and there were several arrest pauses existing in the transitory crack arrest process.

关键词： Impact loads Crack propagation Crack arrest Numerical simulation Fractal method Dynamic stress intensity factor

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