南江县浅层土质滑坡降雨入渗规律与成因机理

doi:10.11988/ckyyb.20160431

院报 ›› 2017, Vol. 34 ›› Issue (8): 96-100.DOI: 10.11988/ckyyb.20160431

南江县浅层土质滑坡降雨入渗规律与成因机理

王森^{1, 2}, 许强¹, 罗博宇¹, 王一超¹, 刘文德¹

1.成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都 610059;
2.中铁二院(成都)建设发展有限责任公司,成都 610031

收稿日期:2016-05-05 修回日期:2016-06-13 出版日期:2017-08-01 发布日期:2017-08-18
作者简介:王森(1988-),男,四川巴中人,硕士研究生,研究方向为地质灾害防治,(电话)18117832947(电子信箱)wanliao@outlook.com。

Rainfall Infiltration and Formation Mechanism of Shallow Soil Landslides in Nanjiang

WANG Sen^{1, 2}, XU Qiang¹, LUO Bo-yu¹, WANG Yi-chao¹, LIU Wen-de¹

1.State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China;
2.China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China

Received:2016-05-05 Revised:2016-06-13 Online:2017-08-01 Published:2017-08-18
Supported by:
四川省国土资源厅科学研究计划项目(KJ-2015-18))

摘要/Abstract

摘要： 为揭示土质滑坡中降雨入渗规律和滑坡成因机理,通过对四川南江县100多个滑坡进行现场调查、统计,选取二潢坪滑坡深入剖析典型滑坡成因机理,对降雨量、GPS累积位移、土体孔隙水压力、土体含水率等综合因素分析后,采用有限元数值法对滑坡的降雨入渗过程进行模拟。结果表明:浅层土质滑坡中孔隙水压力及含水率变化有明显滞后现象,降雨初期以垂直坡面入渗为主,一段时间后则以坡向渗流为主;斜坡中前缘孔隙水压力变化比后缘对降雨更敏感,其原因为前缘黏性堆积体、侧壁陡崖及基岩面共同构成斜坡储水边界;因滑体结构的各向异性,降雨过程中土体中局部孔隙水压力及渗流力瞬时剧增,土体饱水使得软黏土层发生软化,最终导致斜坡整体失稳。

关键词: 浅层土质滑坡, 降雨入渗, 变形监测, 成因机理, 孔隙水压力

Abstract: Through field investigation and statistics of more than 100 landslides in Nanjiang county, the Erhuang ping landslide was selected as a case study to reveal the formation mechanism of and rainfall infiltration in soil landslide. Through analyzing multiple factors including precipitation, accumulative displacement of GPS, pore-water pressure and moisture content of soil, the process of rainfall infiltration of Erhuangping landslide was simulated by finite element analysis. Results showed that the variations of pore-water pressure and soil moisture of shallow soil in the landslide lagged obviously in the initial stage of rainfall precipitation. The main infiltration direction was perpendicular to the surface of slope, and then changed to be along the slope direction. As a water-storing boundary was formed by the cohesive accumulation body, steep side cliff and bedrock surface, pore water pressure in the front edge of slope was more sensitive to rainfall than that in the rear edge does. Due to the anisotropy of slip mass, local pore water pressure and seepage force rises sharply during rainfall, and the soft clay softened, finally resulting in the global instability of slope.

Key words: shallow soil landslide, infiltration of rainfall, deformation monitoring, formation mechanism, pore water pressure

中图分类号:

P642.22

王森, 许强, 罗博宇, 王一超, 刘文德. 南江县浅层土质滑坡降雨入渗规律与成因机理[J]. 院报, 2017, 34(8): 96-100.

WANG Sen, XU Qiang, LUO Bo-yu, WANG Yi-chao, LIU Wen-de. Rainfall Infiltration and Formation Mechanism of Shallow Soil Landslides in Nanjiang[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2017, 34(8): 96-100.

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南江县浅层土质滑坡降雨入渗规律与成因机理

Rainfall Infiltration and Formation Mechanism of Shallow Soil Landslides in Nanjiang

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