降雨强度对紫色土工程堆积体边坡稳定性的影响  

Effects of Rainfall Intensity on Slope Stability of Purple Engineering Spoil

作　　者：李叶鑫[1,2,3] 史东梅 吕刚[3] 林姿 

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]西南大学资源环境学院,重庆400715 [3]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000

出　　处：《土壤通报》2017年第6期1475-1480,共6页Chinese Journal of Soil Science

基　　金：重庆市水利局科技项目(ZXKJXM001286;ZXKJXM002825)资助

摘　　要：以重庆市紫色土工程堆积体为研究对象,结合室内土壤物理力学性质分析和Geo-Studio 2012软件计算不同降雨事件下工程堆积体的最危险滑动面和边坡安全系数,定量分析水土保持措施对工程堆积体稳定性的作用。结果表明:土壤容重随着降雨强度的增大而减小,不同降雨条件下各个坡位土壤容重均表现为坡上<坡中<坡下;小雨、中雨、大雨条件下土壤含水率分别为17.05%、18.80%和21.92%,即土壤含水率随着降雨强度的增大而增大;不同坡位的土壤粘聚力和内摩擦角有所不同,土壤粘聚力大小依次为坡上<坡中<坡下,而内摩擦角无明显变化规律。不同降雨事件的最危险滑动面和边坡安全系数明显不同,小雨、中雨、大雨条件下边坡安全系数为1.806、1.355、1.243;挡墙和削坡可以有效地提高工程堆积体的稳定性,边坡安全系数分别提高8.42%和6.59%。研究结果为生产建设项目工程堆积体水土流失防治提供科学依据。By taking the typical purple engineering spoil in Chongqing as the research object,the critical slip surfaces and safety factors of engineering spoil were studied with soil physical and mechanical analysis and Geo-Studio software under different rainfall events and the effect of soil and water conservation measures on the engineering spoil were analyzed quantitatively.The results indicated that soil bulk density reduced with the increase of rainfall intensity and it decreased at different slope positions as follows upper middle lower.The soil moisture contents were17.05%,18.80% and 21.92%,respectively,under light,moderate,heavy rainfall events and increased with the increase of rainfall intensity.The soil cohesive force and internal frictional angle were different at slope positions.The order of soil cohesive force was upper middle lower and the internal frictional angle had no obvious regularity.The critical slip surfaces and safety factors were different under different rainfall events and the safety factors were 1.806,1.355 and 1.243,respectively,under light,moderate,heavy rainfall intensity.The retaining wall and slope cutting effectively improved the stability of engineering spoil and the safety factors,respectively,increased by 8.42% and6.59% compared without any measures of soil and water conservation.These results could provide some scientific basis for soil erosion of engineering spoil in production and construction projects.

关 键 词：工程堆积体 边坡稳定性 降雨强度 Geo-Studio软件 生产建设项目 

分 类 号：S715[农业科学—林学]