降雨特性对滑坡孔隙水压力影响的试验研究

发布时间：2018-03-11 14:46

本文选题：土质滑坡　切入点：孔隙水压力　出处：《重庆师范大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：【目的】降雨条件是中国诱发滑坡灾害的根本原因,探讨滑坡体内孔隙水压力对降雨特性的响应关系是揭示滑坡成灾机制的关键环节。【方法】递增型降雨和中峰型降雨是重庆境内诱发滑坡灾害的主要降雨型式,据此采用模型试验方法分析滑坡体内孔隙水压力对降雨特性的响应问题。通过模型试验,得到了滑坡体内孔隙水压力随降雨历时的系列变化曲线。【结果】降雨作用下滑坡体内孔隙水压力的变化过程可分成缓变阶段、激增阶段和稳定阶段,且仅在激增阶段后期和稳定阶段时滑坡体才达到饱和状态;递增型降雨条件下各测点记录的孔隙水压力峰值点线斜率小于中峰型降雨条件下孔隙水压力峰值点线斜率,表明中峰型降雨更易使滑坡体达到饱和状态;滑坡表面的裂缝可显著影响降雨入渗特性,裂缝以下部分滑坡体更易发生变形和破坏;运用非饱和土力学理论对试验结果进行了科学解释。【结论】研究成果对于进一步研究降雨对滑坡稳定性的量化作用有积极意义。
[Abstract]:[objective] rainfall conditions are the fundamental causes of landslide disasters in China. To explore the response of pore water pressure in landslide to rainfall characteristics is the key link to reveal the mechanism of landslide disaster. [methods] incremental rainfall and mid-peak rainfall are the main rainfall patterns that induce landslide disaster in Chongqing. Based on this, the response of pore water pressure in landslide to rainfall characteristics is analyzed by the method of model test. A series of curves of pore water pressure in landslide with rainfall duration are obtained. [results] the change process of pore water pressure in landslide under rainfall can be divided into three stages: slow change stage, surge stage and stable stage. The slope of peak point of pore water pressure recorded at every measuring point is smaller than that of peak point of pore water pressure under the condition of increasing rainfall, and the slope of slope of peak point of pore water pressure is smaller than that of peak point of pore water pressure under the condition of increasing rainfall, and the slope of peak point of pore water pressure is smaller than that of peak point of pore water under the condition of increasing rainfall. The results show that the mid-peak rainfall can make the landslide reach saturation state more easily, the cracks on the surface of the landslide can significantly affect the rainfall infiltration characteristics, and the landslide body below the crack is more prone to deformation and destruction. The experimental results are scientifically explained by the theory of unsaturated soil mechanics. [conclusion] the research results have positive significance for further study on the quantitative effect of rainfall on landslide stability.
【作者单位】：重庆交通大学岩土工程研究所;
【基金】：国家科技攻关项目(No.GYHY201006039) 重庆市自然科学基金重点项目(No.2013JJB0005) 2013年重庆高校创新团队建设计划资助项目(No.KJTD201305) 重庆市“两江学者”计划专项经费资助(No.201309)
【分类号】：P642.22

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