基于FLAC3D模拟的路基边坡稳定性分析

Analysis on Stability of Roadbed Slope Based on FLAC3D Simulation

在修建山区公路时由于受地形条件限制,多采用高填方路基,填土在自重及荷载作用下极易沿着滑动面下滑形成滑动土体,路基失去稳定性。为了分析滑动土体的稳定性,应用极限平衡法中的条分表解法计算实例边坡的稳定性系数,再用FLAC3D强度折减法计算该边坡的稳定性系数,其中FLAC3D模拟通过将抗剪强度参数降低至极限破坏状态为止,最终计算出强度储备安全系数k。通过对比极限平衡法与FLAC3D强度折减法计算出来的稳定性系数,结果发现:两者安全系数相差不大,可以考虑将FLAC3D软件应用于该类工程来分析边坡稳定性,并且为实际工程支护结构设计提供科学依据。

Due to the limitation of topographic condition,high-filled roadbed is mostly adopted when building the mountain highway.The roadbed losts the stability due to the sliding soil mass slides along the sliding surface under the effect of dead load and load of filled earth.In order to analyze the stability of the sliding soil mass,the stability coefficient of the living example like side slope is calculated by using the tabulated solution of slices in the limit equilibrium method and FLAC3D strength reduction method.In which,the strength reserve safety factor k is finally calculated by the FLAC3D simulation to reduce the shearing strength parameter to the ultimate failure status.Through the comparison on the stability coefficient calculated by the limit equilibrium method and FLAC3D strength reduction method,we discover that,the safety coefficients have little difference,and we can consider applying FLAC3D software in this kind of engineering to analyze the slope stability and provide scientific basis for the design of supporting structure in actual engineering.