【作者】 顾春生； 杨伟峰； 吴泽辉； 曹乐；

【Author】 GU Chunsheng;YANG Weifeng;WU Zehui;CAO Le;School of Resources and Geosciences,China University of Mining and Technology;School of Civil Engineering and Architecture,East China Institute of Technology;

【机构】 中国矿业大学资源与地球科学学院； 东华理工大学建筑工程学院；

【摘要】 在降雨条件下边坡失稳过程中存在一系列失稳预兆。文章用基于布拉格光纤光栅(FBG)传感器的模型试验方法进行验证降雨是造成边坡失稳的重要因素之一,并用数值模拟方法解释降雨诱发边坡失稳机理。运用多种监测方法对降雨条件下顺层岩质边坡进行模型。利用TDR-3土壤水分传感器对边坡含水量进行实时监控,并观察坡体破坏前被冲刷状况,得出降雨过程实质为边坡含水量变化以及软弱夹层被冲刷软化的过程;利用FBG传感器监测顺层边坡层间应变变化趋势,得出滑坡时间一应变关系,并确定滑面入口以及潜在破坏位置;利用百分表得出滑体位移-时间演化数据,从而识别滑速演化情况;最终将顺层岩质边坡失稳过程划分为3个阶段:启动阶段、蠕动滑动阶段、加速滑动阶段,并指出各阶段演化特征,同时提出描述顺层岩质边坡滑移演化指标——滑速柱状图,并利用滑速柱状图对降雨边坡失稳进行预测预报。更多还原

【Abstract】 Slope instability under rainfall has a series of omens.In this paper,it is proved that rainfall infiltration play a very important rule in the process of the slope failure by the model test method.The mechanism of slope failure caused by rainfall infiltration is explained with numerical simulation method.Several monitoring methods were applied to the model test in this paper.In the model test,variation of soil water content is available by TDR-3 Sensors,and erosion situation of slope body can be observed before its unsteadiness,which show that the nature causes of the landslide are the variation of Soil water content and the water softening.To conclude time-strain relations as well as the evolution of slope-mass slide displacement through monitoring the slope strain variation with FBG Sensors.Then the potential damage position of week structural plane can be located.In addition,dial indicators were used to monitor the displacement of the slope.The slope failure is divided into three stages:initialization phase,creeping and sliding stage,acceleration phase and describe the characteristics of each stages.In the end,the forecast methods of slope failure are put forward with the histogram of the landslide speed.更多还原