摘要
本文在考虑边坡岩体参数非确定的基础上,基于二次响应面的边坡稳定可靠度分析方法,采用快速拉格朗日方法建立了震区岩质边坡稳定性可靠指标计算模型。结合湖南省对口支援四川理县灾后重建项目——理县至小金公路(理县段)路堑边坡,开展了震区边坡稳定性可靠度分析,计算结果表明:二次响应面计算次数远远少于传统蒙特卡洛方法,计算结果满足精度要求;通过对依托工程边坡动力数值模拟的可靠度分析表明,采用二次响应面法计算的可靠度指标Pf=6.861%,采用传统蒙特卡洛方法计算的可靠度指标Pf=5.117×10-2,计算精度较好;最大剪应变增量出现在坡体表面坡腰处,故选择该坡腰处作为边坡安全的控制点,其可靠度最小值为3.1左右,时间出现在16.5 s,可靠度满足设计要求,表明该处边坡整体稳定性较好。
Taken non-determinism for parameters of rock slope into account,a calculation model of reliability index for rock slope stability in seismic area is established by using fast Lagrangian method,based on the square response surface method for analysis on reliability of slope stability.Combined with the cutting slope in Li County to Xiaojin highway（Li County section）,which is the post-disaster reconstruction projects partner assistance on Li County in Sichuan Province by Hunan Province,a reliability analysis of slope stability is carried out in seismic area.The results show that the calculation number of square response surface method is far less than the traditional Monte Carlo method,and the calculation results meet the accuracy requirements.Relying on dynamic numerical simulation of slope in support engineering,the reliability analysis shows that the quadratic response surface method to calculate the reliability index Pf is equal to 6.861% by using square response surface method,and the reliability index Pf is equal to 5.117×10-2 by using traditional Monte Carlo method.The maximum shear strain increment occurs to at the waist of slope on slope surface,thus the waist of slope is chosen as a control point of slope safety.Its minimum reliability is 3.1 or so,and the time appears in 16.5 s.The reliability meets the design requirements,and it appears that the stability of slope is better overall.
出处
《公路工程》
2011年第6期15-21,共7页
Highway Engineering
基金
湖南省科技计划重点资助项目(2009JT1021)
长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金资助项目(kfj100303)
