摘要
以深圳盐田区某边坡工程为研究对象,采用极限平衡法,利用Geo-Studio软件进行数值模拟,研究降雨强度、降雨时间对边坡渗流场的影响,同时引入可靠度理论,通过SLOPE/W中的蒙特卡洛随机抽样法对边坡进行可靠性分析,得到不同降雨时刻的边坡平均安全系数以及可靠度指标和失效概率。结果表明,孔隙水压力和体积含水率在降雨初期变化显著,后期随着降雨的持续,变化幅度逐渐减小;相同降雨时长,随着降雨强度的增加,孔隙水压力值变化范围增大;在持续大暴雨条件下,两级边坡中间平台在降雨第5天的入渗深度约为5.5 m,边坡安全系数减小为1.137,失效概率达到9.8%。对边坡进行锚杆支护后,有效提高了边坡的安全系数,加固效果显著。
Taking a slope project in Yantian District of Shenzhen as research object,the limit equilibrium method and Geo-Studio software are used for numerical simulation to study the influences of rainfall intensity and rainfall time on slope seepage field,at the same time,the reliability theory is introduced to analyze the reliability of slope through Monte Carlo random sampling method in SLOPE/W,and the average safety factor,reliability index and failure probability of slope at different rainfall times are obtained.The results show that the pore water pressure and volumetric water content change significantly in the early stage of rainfall and the change range gradually decreases with the continuous rainfall in the later stage.For the same rainfall duration,with the increase of rainfall intensity,the range of pore water pressure increases.Under the condition of continuous heavy rainfall,the affected depth of the middle platform of the two-stage slope on the fifth day of rainfall is about 5.5 m,the slope safety factor is reduced to 1.137,and the failure probability reaches 9.8%.When the slope is supported by bolts,the safety factor of the slope can be effectively improved,showing that the reinforcement effect is remarkable.
作者
芮勇勤
王振华
RUI Yongqin;WANG Zhenhua(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,Liaoning,China)
出处
《水力发电》
CAS
2022年第4期37-43,64,共8页
Water Power
基金
国家重点研发计划项目(2017YFC1503101)。
关键词
路堑边坡
稳定性分析
降雨入渗
安全系数
数值计算
失效概率
cutting slope
stability analysis
rainfall infiltration
safety factor
numerical calculation
failure probability
