基于FLAC3D的十巫高速公路边坡可靠性分析

Reliability analysis of Shiwu expressway slope based on FLAC3D

为了研究十堰至巫溪高速公路边坡的稳定性,将有限差分软件FLAC3D和可靠性理论相结合,运用到边坡的稳定性分析中。采用1000次的Monte-Carlo随机抽样方法对边坡强度参数抽样,代入到FLAC3D数值模型中,采用强度折减法计算边坡的安全系数。计算结果表明,未采取加固措施的边坡的安全系数为1.18,采取锚杆支护后安全系数增加到1.46;未采取加固措施的边坡的破坏概率为22.6%,采取锚杆支护后破坏概率降低到2.3%,边坡的稳定性显著提高,支护设计方案满足安全要求。

In order to study the slope stability of Shiyan-Wuxi expressway,the finite difference software FLAC3D and reliability theory are combined to analyze the slope stability.The Monte Carlo random sampling method of 1000 times is used to sample the strength parameters of the slope,which is brought into the FLAC3D numerical model,and the strength reduction method is used to calculate the safety factor of the slope.The calculation results show that the safety factor of the slope without reinforcement measures is 1.18,and the safety factor increases to 1.46 after adopting bolt support,the failure probability of the slope without reinforcement measures is 22.6%,and the failure probability decreases to 2.3%after adopting bolt support,the stability of the slope is significantly improved,and the support design scheme meets the safety requirements.