花岗岩残积层滑坡形成机理降雨模拟研究
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P642

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国家自然科学基金(41977252, U2005205),地质灾害防治与地质环境保护国家重点实验室自主探索课题(SKLGP2020Z001),广东省有色矿山地质灾害防治中心研究课题。第一作者:冯文凯(1974—),男,汉族,河南新乡,博士,教授。研究方向:岩土体斜坡稳定性及灾害控制、强震区震裂斜坡地质灾害成因与防治。E-mail:fengwenkai@cdut.cn


Study on formation mechanism of granite eluvium landslide by field rainfall simulation
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    花岗岩残积土是一种特殊土,在强降雨条件下极易诱发地质灾害。以广东省龙川县贝岭地区群发性滑坡为背景,采用物理模拟手段探究了典型滑坡的形成机理,获得如下结论:①滑坡发生的影响因素为降雨强度、岩土体物理力学性质、斜坡结构;②降雨并未引起坡体内部土压力及孔隙水压力数值出现异常增减,说明坡体破坏仅限与坡表及坡脚局部的破坏,未有整体变形破坏趋势;③斜坡变形破坏在坡表表现为降雨造成的坡面侵蚀,坡脚表现为临空面的垮塌及潜蚀现象,总体上表现出“逐级后退、依次破坏”破坏特征;④滑坡的演化过程可划分为以下4个阶段:原始斜坡演化阶段、土壤颗粒运移阶段、坡表局部破坏阶段、整体失稳阶段。

    Abstract:

    Granite residual soil is a kind of special soil, which is easy to induce geological disasters under the condition of heavy rainfall. Taking the mass landslides in Beiling area, Longchuan County, Guangdong Province as the background, the formation mechanism of typical landslides was explored by means of physical simulation, and the following conclusions were obtained: ① the influencing factors of landslides were rainfall intensity, physical and mechanical properties of rock and soil mass, slope structure; ② Rainfall does not cause the abnormal increase or decrease of soil pressure and pore water pressure in the slope, indicating that the failure of the slope is limited to the local failure of the slope surface and the slope toe, and there is no overall deformation and failure trend; ③ On the surface of the slope, the slope is eroded by rainfall, and on the foot of the slope, the free surface collapses and undergoes erosion. On the whole, the slope shows the characteristics of "step by step retreat and damage in turn"; ④ The evolutionary process of landslide can be divided into the following four stages: original slope evolution stage, soil particle migration stage, slope surface local failure stage and overall instability stage.

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冯文凯,胡芮,白慧林,等. 花岗岩残积层滑坡形成机理降雨模拟研究[J]. 科学技术与工程, 2022, 22(18): 7799-7809.
Feng Wenkai, Hu Rui, Bai Huilin, et al. Study on formation mechanism of granite eluvium landslide by field rainfall simulation[J]. Science Technology and Engineering,2022,22(18):7799-7809.

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  • 收稿日期:2021-09-11
  • 最后修改日期:2022-06-07
  • 录用日期:2022-01-15
  • 在线发布日期: 2022-07-14
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