降雨入渗条件下下蜀土边坡稳定性分析  被引量:4

STABILITY ANALYSIS OF XIASHU LOESS SLOPE UNDER RAINFALL INFILTRATION

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作  者:刘顺青[1,3] 蔡宇宸 程涛 周萍 王旭畅 LIU Shun-qing;CAI Yu-chen;CHENG Tao;ZHOU Ping;WAMG Xu-chang(School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China;Jiangsu Province Engineering Research Center of Geoenvironmental Disaster Prevention and Remediation,Hefei 230031,China;Anhui Road&Bridge Engineering Co.,Ltd,Zhenjiang 212100,China)

机构地区:[1]江苏科技大学土木工程与建筑学院,镇江212100 [2]安徽省公路桥梁工程有限公司,合肥230031 [3]江苏省地质环境灾害防治及修复工程研究中心,镇江212100

出  处:《地质灾害与环境保护》2022年第2期32-37,共6页Journal of Geological Hazards and Environment Preservation

基  金:国家自然科学基金项目(51979128);国家级大学生创新创业训练计划项目(202110289004)。

摘  要:针对下蜀土边坡在实际降雨入渗条件下稳定性规律研究的不足,以镇江典型下蜀土边坡为研究对象,根据自动化监测获得的降雨入渗下的含水率变化数据,开展了降雨入渗条件下下蜀土抗剪强度演化规律的试验研究,获得了下蜀土在实际降雨入渗下的强度及降雨入渗深度特性,并以此为基础,基于有限元强度折减法分析了降雨入渗后下蜀土边坡的稳定性变化规律。研究结果表明:下蜀土的抗剪强度受含水率影响较大,同时存在一界限含水率,在该含水率左右的下蜀土强度特性不同;随着含水率的增加,下蜀土的黏聚力先小幅减小,而后急剧减小,最后再小幅减小并最终保持稳定;下蜀土的内摩擦角则为先急剧减小,再小幅减小并最终保持稳定;随着降雨渗入下蜀土边坡后,下蜀土边坡的安全系数近似呈线性趋势减小。研究结果可为下蜀土边坡的防护治理提供理论依据,具有实际工程意义。Aiming at the deficiency of the research on the stability analysis of Xiashu loess slope under the condition of actual rainfall infiltration,the typical Xiashu loess slope in Zhenjiang was used as the research object.According to the change data of water contents under the condition of rainfall infiltration obtained by automatic monitoring,the experimental research on the evolution law of shear strength of Xiashu loess under the condition of rainfall infiltration was carried out.The strength and rainfall infiltration depth characteristics of Xiashu loess under actual rainfall infiltration were obtained.On this basis,the stability change law of Xiashu loess slope under rainfall infiltration was analyzed based on the finite element strength reduction method.The results show that the shear strength of Xiashu loess is greatly affected by the water content,and there is a limit water content at which the strength characteristics of Xiashu loess are different.With the increase of water contents,the cohesion of Xiashu loess decreases slightly at first,then decreases sharply,finally decreases slightly,and finally remains stable.The internal friction angle of Xiashu loess first decreases sharply,then decreases slightly and finally remains stable.With the infiltration of rainfall into Xiashu loess slope,the safety factors of Xiashu loess slope decrease approximately linearly.The research results can provide a theoretical basis for the protection and treatment of Xiashu loess slope,and have practical engineering significance.

关 键 词:降雨入渗 下蜀土边坡 含水率 抗剪强度 现场测试 

分 类 号:TU411[建筑科学—岩土工程]

 

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