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（1 湖南工業(yè)大學(xué)土木工程學(xué)院， 株洲 412007；2 東莞理工學(xué)院城市學(xué)院城市與環(huán)境科學(xué)系， 東莞 523419）

［摘要］我國南方地區(qū)邊坡廣泛分布有土石混合的殘積土層，殘積土層下臥有基巖，常由于降雨和地下水滲流導(dǎo)致坡體失穩(wěn)。依據(jù)這一工程背景開展了室內(nèi)模型試驗(yàn)研究，利用衡陽某隧道花崗巖殘積土和級配碎石混合來模擬現(xiàn)場殘積土，用醫(yī)用滴管來模擬降雨，用預(yù)埋的接自來水的帶孔PVC管模擬潛水，研究了潛水單獨(dú)滲流然后經(jīng)歷不同降雨強(qiáng)度的邊坡土體內(nèi)部沉降、土壓力和土體含水量的變化。試驗(yàn)表明，隨著潛水滲流和降雨的進(jìn)行，土體含水量不斷增加，但不同位置增加程度不一，邊坡中間層含水量最大，土壓力和土體內(nèi)部沉降不明顯，邊坡破壞主要表現(xiàn)為潛蝕。

［關(guān)鍵詞］殘積土； 降雨； 潛水； 土壓力； 沉降； 潛蝕

中圖分類號：TU411.93     文獻(xiàn)標(biāo)識碼：A     文章編號：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

*湖南省教育廳科研基金優(yōu)秀青年項(xiàng)目（10B025），湖南省研究生科研創(chuàng)新項(xiàng)目（CX2011B392）。

通訊作者：歐蔓麗，碩士，副教授，Email：445698185@qq.com。

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