摘要
分析了岩土体在不同含水率条件下抗剪强度参数和弹性模量的弱化规律,选取极端降雨条件作为模拟工况,并采用Geo-Studio模拟软件对极端降雨条件下边坡体积含水率进行数值分析。以上述的研究结果为基础,运用Geo-Studio模拟软件对该滑坡的位移及稳定性进行数值模拟分析,结果发现坡体表层的含水率受降雨因素的影响最为敏感。降雨前期,坡体表层含水率最先达到饱和,且弱化效应对坡体位移和稳定性影响较小。降雨中期,边坡内部含水率持续增加,边坡的整体稳定性和位移的变化速率明显加快。降雨后期,边坡内部含水率为21%~30%和31%至饱和的两大变化区域基本达到稳定,边坡的整体稳定性和位移的变化量达到最小,但增载弱化复合动力效应使坡体位移增加率和稳定性弱化率达到最大。因此,降雨的中后期对边坡的整体稳定和位移的影响最大。
This stuoly analyzes the weakening law of shear strength parameters and elastic modulus of rock and soil under different water content conditions,and extreme rainfall conditions are selected as the simulated conditions.Numerical analysis of the water content of the slope volume under rainfall infiltration condition was carried out by Geo-Studio finite element simulation software.From the results of the above research,the displacement and stability of the landslide were numerically simulated by Geo-Studio software.It is found that the water content of the slope surface is most sensitive to the influence of rainfall factors.In antecedent precipitation,the surface water content of the slope reached saturation first,and the weakening effect had little effect on the displacement and stability of the slope.In the middle of rainfall,the water content inside the slope continued to increase,and the rate of change of the overall stability and displacement of the slope significantly accelerated.In the later period of rainfall,the two large variation areas of the slope with internal water content of 21%~30%and 31%to saturation are basically stable,and the variation of the overall stability and displacement of the slope is minimized,but the load-shedding composite dynamic effect makes the increase rate of shope displacement and the rate of stability weakening reach the maximum.Therefore,the mid-late period of rainfall has the greatest impact on the overall stability and displacement of the slope.
作者
刘洪华
张兰阁
贺可强
郭璐
徐红兵
王忠胜
LIU Hong-hua;ZHANG Lan-ge;HE Ke-qiang;GUO Lu;XU Hong-bing;WANG Zhong-sheng(Qingdao Geo-Engineering Surveying Institute(Qingdao Geological Exploration and Development Bureau),Qingdao 260071,China;Henan D.R.Construction Group Co.,Ltd.,Xinxiang 453002,China;Engineering Technique Research Center of Geo-Environment and Impact,Qingdao University of Technology,Qingdao 266033,China;Qingdao Geological and Mineral Geotechnical Engineering Co.,Ltd.,Qingdao 266100,China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2020年第5期1015-1022,共8页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(41372297)
山东省自然科学基金项目(ZR2017PD011)
青岛地质工程勘察院开放基金资助项目(2019-QDDZYKF02)。
关键词
边坡
降雨
含水率
数值分析
增载弱化效应
side slope
rainfall
the moisture content
numerical analysis
loading-weakening effect
