（1 湖南工业大学土木工程学院， 株洲 412007；2 东莞理工学院城市学院城市与环境科学系， 东莞 523419）

［摘要］我国南方地区边坡广泛分布有土石混合的残积土层，残积土层下卧有基岩，常由于降雨和地下水渗流导致坡体失稳。依据这一工程背景开展了室内模型试验研究，利用衡阳某隧道花岗岩残积土和级配碎石混合来模拟现场残积土，用医用滴管来模拟降雨，用预埋的接自来水的带孔PVC管模拟潜水，研究了潜水单独渗流然后经历不同降雨强度的边坡土体内部沉降、土压力和土体含水量的变化。试验表明，随着潜水渗流和降雨的进行，土体含水量不断增加，但不同位置增加程度不一，边坡中间层含水量最大，土压力和土体内部沉降不明显，边坡破坏主要表现为潜蚀。

［关键词］残积土； 降雨； 潜水； 土压力； 沉降； 潜蚀

中图分类号：TU411.93     文献标识码：A     文章编号：1002-848X(2015)06-0089-04

Experimental study of residual soil slope stability under action of rainfall and phreatic water

Zhu Fangcai1, Ou Manli1, Chen Chunming2

 (1 School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China; 

2 Department of City and Environmental Science, City College,

Dongguan University of Technology, Dongguan 523419, China)

Abstract:The residual soil layer composed of soil and rocks, which is widely distributed in the south  area of China, locates above the bedrock and often leads to slope instability due to rainfall and groundwater seepage. The indoor model test study was carried out according to the engineering background. Mixture of granite residual soil and graded broken rock in a tunnel in Hengyang was used to simulate the insitu residual soil. Medical burette was used to rainfall simulation and buried PVC pipe with holes and tap water was used to simulate phreatic water. On the conditions of phreatic water seeping alone and then undergoing different rainfall intensities, the internal settlement, soil pressure and soil water content of slope soil were studied. Experiments show that as phreatic water seeps and rain falls, soil water content increases and the increasing degree of different positions is different. The water content of middle layer of the slope has the maximum water content, while soil pressure and soil internal settlement are not obvious. The subsurface erosion is the main feature for slope failure.

Keywords:residual soil; rainfall; phreatic water; soil pressure; settlement; subsurface erosion

*湖南省教育厅科研基金优秀青年项目（10B025），湖南省研究生科研创新项目（CX2011B392）。

通讯作者：欧蔓丽，硕士，副教授，Email：445698185@qq.com。

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