滑坡堆积体降雨入渗过程物理模拟试验研究
Study on Physical Simulation of Rainfall Infiltration Process of Landslide Accumulation Body
作者：王如宾(河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098;三峡库区地质灾害教育部重点实验室(三峡大学), 湖北 宜昌 443002)；夏瑞(河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098)；徐卫亚(河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098)；王环玲(河海大学 港口海岸与近海工程学院, 江苏 南京 210098)；祁健(河海大学 岩土力学与堤坝工程教育部重点实验室, 江苏 南京 210098)
Author：WANG Rubin(Key Lab. of Ministry of Education for Geomechanics and Embankment Eng., Hohai Univ., Nanjing 210098, China;Key Lab. of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges Univ.), Ministry of Education, Yichang 443002, China)；XIA Rui(Key Lab. of Ministry of Education for Geomechanics and Embankment Eng., Hohai Univ., Nanjing 210098, China)；XU Weiya(Key Lab. of Ministry of Education for Geomechanics and Embankment Eng., Hohai Univ., Nanjing 210098, China)；WANG Huanling(College of Harbour, Coastal and Offshore Eng., Hohai Univ., Nanjing 210098, China)；QI Jian(Key Lab. of Ministry of Education for Geomechanics and Embankment Eng., Hohai Univ., Nanjing 210098, China)
收稿日期：2019-03-12 年卷（期）页码：2019,51(4):47-54
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：降雨入渗;滑坡物理模拟试验;降雨强度;孔隙水压力;滑坡堆积体
Key words：rainfall infiltration;landslide physical simulation test;rainfall intensity;pore water pressure;landslide accumulation
基金项目：国家重点研发计划项目（2017YFC1501100）；三峡库区地质灾害教育部重点实验室（三峡大学）开放研究基金项目（2015KDZ14）；中央高校基本科研业务费专项资金资助（2019B13814）；河海大学岩土力学与堤坝工程教育部重点实验室开放基金项目（GHXN201905）
中文摘要
降雨强度对滑坡坡面降雨入渗过程有显著影响，进而对滑坡变形稳定起着重要作用，孔隙水压力变化是降雨入渗诱发滑坡失稳的重要因素。为进一步探明降雨入渗过程与堆积体滑坡变形失稳破坏模式之间的内在关系，基于人工模拟降雨室内大型滑坡模型试验，研究了不同降雨强度下滑坡堆积体孔隙水压力变化与土压力的响应规律与变形破坏模式，揭示了降雨诱发滑坡变形破坏机理。结果表明：降雨入渗引起滑坡堆积体内孔隙水压力和土压力增加，且随着降雨强度的增大，滑坡体内孔隙水压力和土压力增长速率随之增大。堆积体滑坡变形破坏与孔隙水压力变化密切相关，滑坡堆积体内孔隙水压力随降雨历时的增加不断变大，进而基质吸力不断减小；滑坡体破坏区上侧会产生拉裂缝，下侧由于挤压作用出现土体隆胀，坡脚处会出现局部流土等现象。降雨强度大小与堆积体滑坡变形破坏模式密切相关，雨强大小为0.44 mm/min时，形成多级后退式滑坡变形破坏；雨强为0.57 mm/min时，滑坡体沿最危险剪切面发生大范围滑动破坏，并最终形成塑性流动。
英文摘要
Rainfall intensity has a significant influence on the rainfall infiltration process of landslide slope, and thus plays an important role in the deformation stability of landslide. To reveal the relationship between rainfall infiltration process and the failure mode of landslide deformation and instability, the response law and deformation and failure mode of pore water pressure and soil pressure of landslide accumulation body under different rainfall intensity were deeply studied based on the indoor large-scale landslide model test of artificial rainfall simulation, and the deformation and failure mechanism of rainfall-induced landslide was revealed. Results showed that rainfall infiltration caused the increase of pore water pressure and soil pressure in landslide accumulation, and the growth rate of pore water pressure and soil pressure increased with the increase of rainfall intensity. The deformation and failure of deposit landslide was closely related to the pore water pressure changes, the pore water pressure of the deposit landslide increased along with the increase of rainfall duration grows, and the matrix suction decreased continuously, landslide damage zone will produce cracks, upper side due to squeezing effect under the heaving of soil, slope toe would be partial flow phenomenon such as soil. The rainfall intensity was closely related to the deformation and failure mode of the accumulation landslide when the rain strength was 0.44 mm/min. A wide range of sliding failure occured along the slope along the most dangerous shear plane, and eventually plastic flow was formed when the rain strength is 0.57 mm/min.
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