【摘要】 在深入分析可靠度指标的几何意义和JC法的基本原理的基础上,构造了滑坡抗滑桩结构的功能函数。分析了陕西省吴起县大路沟巨型黄土滑坡的工程地质条件,根据滑坡的工程地质勘察资料和滑坡治理工程的设计资料,建立了基于ANSYS的抗滑桩桩土体系有限元模型,经过自重作用下桩土结构数值的模拟,验证了该有限元模型的有效性。在此基础上,选取滑体土重度γ、滑面土内聚力C和内摩擦角、滑面以下土的压缩模量Es四个随机变量,建立了基于ANSYS软件和JC法的抗滑桩结构可靠度计算模型,并研制了相应算法,算例结果表明:基于ANSYS和JC法的抗滑桩结构的失效概率pf=0.49%,可靠度指标β=2.58,失效概率略大于蒙特卡洛(MCS)抽样算法结果和CCD响应面法(RSM)结果,但是基于ANSYS和JC法的效率最高,从而验证了该可靠度模型及算法的有效性。更多还原

【Abstract】 Based on the in-depth analysis of the geometric meaning of reliability index and the basic theory of JC method,the performance function of anti-slide pile soil system is proposed. On the basis of analysis of engineering geological conditions of Dalugou loess landslide in Wuqi County Shaanxi Province,according to the landslide geological survey data and design information of landslide remediation engineering,the finite element model-based ANSYS software platform of anti-slide pile soil system is established. The numeric simulation results of pile and soil system under own weight condition proves the validity of the finite element model. Moreover,the density γ of landslide,cohesion c and internal friction angle  of slide surface,and compression modulus Es,four random variables of sliding bed,the reliability calculation model of anti-slide pile based on ANSYS software and JC method is established,and the corresponding algorithm is developed. The sample calculation shows that,the probability of failure of anti-slide pile structure Pf= 0. 49% and β = 2. 58,which is little larger than that of MCS Sampling method,and that of CCD Responding Surface method. The example verified the validity of the reliability model and corresponding algorithm.更多还原