Based on the upper bound limit analysis theorem and the shear strength reduction technique, the equation for expressing critical limit-equilibrium state was employed to define the safety factor of a given slope and it...Based on the upper bound limit analysis theorem and the shear strength reduction technique, the equation for expressing critical limit-equilibrium state was employed to define the safety factor of a given slope and its corresponding critical failure mechanism by means of the kinematical approach of limit analysis theory. The nonlinear shear strength parameters were treated as variable parameters and a kinematically admissible failure mechanism was considered for calculation schemes. The iterative optimization method was adopted to obtain the safety factors. Case study and comparative analysis show that solutions presented here agree with available predictions when nonlinear criterion reduces to linear criterion, and the validity of present method could be illuminated. From the numerical results, it can also be seen that nonlinear parameter rn, slope foot gradient ,β, height of slope H, slope top gradient a and soil bulk density γ have significant effects on the safety factor of the slope.展开更多
随着我国山区高速公路建设的不断推进,弃渣场地的稳定性及致灾机制成为工程建设评估的重要因素之一。为了实现弃渣场的稳定性、失稳灾害动力学全过程的分析,基于面向GPU并行高性能计算软件CoSim中的物质点法(material point method,简称...随着我国山区高速公路建设的不断推进,弃渣场地的稳定性及致灾机制成为工程建设评估的重要因素之一。为了实现弃渣场的稳定性、失稳灾害动力学全过程的分析,基于面向GPU并行高性能计算软件CoSim中的物质点法(material point method,简称MPM),引入强度折减法(strength reduction method,简称SRM)开展相关研究工作。为了验证算法的合理性,以典型均质边坡为例,采用基于MPM的强度折减法与极限平衡法(limit equilibrium method,简称LEM)进行了对比,表明两者无论在稳定系数Fs还是在潜在滑动面上均具有良好的一致性。在此基础上,以云南某高速公路弃渣场降雨诱发失稳灾害为例,对其在天然工况和暴雨工况下稳定性和失稳过程进行了分析。结果表明,该弃渣场边坡在天然状态下处于稳定状态,而在暴雨工况下会发生失稳和大变形滑动;数值模拟和现场调查结果吻合较好,表明了提出的方法在弃渣场边坡稳定性与大变形失稳动力学分析中有强大的优势,可以实现斜坡的“稳定性→大变形→流动→堆积”的全过程分析。展开更多
基金Project(2006318802111) supported by West Traffic Construction Science and Technology of ChinaProject(2008yb004) supported by Excellent Doctorate Dissertations of Central South University, China Project(2008G032-3) supported by Key Item of Science and Technology Research of Railway Ministry of China
文摘Based on the upper bound limit analysis theorem and the shear strength reduction technique, the equation for expressing critical limit-equilibrium state was employed to define the safety factor of a given slope and its corresponding critical failure mechanism by means of the kinematical approach of limit analysis theory. The nonlinear shear strength parameters were treated as variable parameters and a kinematically admissible failure mechanism was considered for calculation schemes. The iterative optimization method was adopted to obtain the safety factors. Case study and comparative analysis show that solutions presented here agree with available predictions when nonlinear criterion reduces to linear criterion, and the validity of present method could be illuminated. From the numerical results, it can also be seen that nonlinear parameter rn, slope foot gradient ,β, height of slope H, slope top gradient a and soil bulk density γ have significant effects on the safety factor of the slope.
