摘要
为了揭示触发因素对滑坡成灾机制和运动规律的影响,在相同地质条件下,开展降雨和开挖导致滑坡的现场试验,分别对比了降雨型滑坡和开挖型滑坡的滑面形态与土体强度指标,以及二者的变形破坏情况。结果表明:1在相同正应力情况下,降雨型滑坡试块的剪切强度小于人工开挖型滑坡试块的剪切强度,说明降雨对于边坡岩土体性质的劣化影响要大于开挖扰动的影响;2降雨对于土体的内摩擦角的影响较大,而开挖对于土体的粘结力的影响较大;3降雨导致其边坡土体的强度降低较为明显,土体的稳定性降低程度较大,从而降雨型滑坡的变形速率大于开挖型滑坡的变形速率。开挖型滑坡启动较快,突发性强,危害性大,降雨型滑坡启动较慢。
In order to reveal the influence of the trigger factors of landslide hazard mechanism and principle,the artificial rainfall simulation field test and mechanical excavation field test are carried out in the same geological conditions. The comparison analysis of the sliding surface shape and strength of soil,as well as the deformation failure situation are done for both the rainfall type landslide and excavation type landslide. The results show that： 1 Under the same normal stress,the shear strength of test sample from the rainfall type landslide is smaller than that from the artificial excavation type landslide,indicating that the deteriorating effect caused by the rainfall is larger than that of excavation disturbance; 2 The rainfall mainly affects the friction angle,and the excavation disturbance mainly affects the cohesion of soil; 3 The decrease of strength of the slope soil due to the rainfall relatively obvious,the stability of the soil reduce degree is larger,and rainfall type landslide deformation rate is greater than the excavation type landslide. Excavation type landslide starts quickly,sudden strong,and the harm is bigger,rainfall type landslide start slowly.
出处
《四川建筑科学研究》
北大核心
2016年第2期47-50,共4页
Sichuan Building Science
基金
江西省交通运输厅重点科技项目(2013C0009
2013C0010
2013C0013)
关键词
降雨
开挖
滑坡
现场试验
土体强度
变形破坏
rainfall
excavation
landslide
field test
soil strength
deformation failure
