水位涨落引起的库岸再造对岸坡稳定性的影响研究  

Influence of Reservoir Bank Reformation Caused by Water Level Fluctuating on Bank Slope Stability

作　　者：杨广[1] 晏鄂川[1] 李庆伟 YANG Guang;YAN E chuan;LI Qingwei(Faculty of Engineering,China University of Geosciences（Wuhan）,Wuhan 430074,Chin)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2018年第4期46-50,75,共6页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41672313)

摘　　要：自三峡库区开始蓄水以来,岸坡岩土体遇水饱和,物理力学强度降低,并受到周期性的河流地质作用,产生冲刷和淤积,最终造成岸坡地形的改变,即库岸再造,而目前岸坡稳定性研究未考虑库岸再造的影响。以巫山县某岸坡为例,对比分析了蓄水前后岸坡地形的变化特征,并利用数值模拟方法对岸坡地下水渗流特征和稳定性进行了研究。结果表明:岸坡不同位置和高程处地形的改变因地表水力特征的差异而有所不同;随着库水位的下降,岸坡地下水浸润线平缓下降,但坡度较陡一侧岸坡地下水渗流水力梯度更大,且在同一工况下,地形改造后的岸坡稳定性更高。Since the Three Gorges reservoir impounded water,rock and soil of the bank slope has become saturated,which leads to decreased mechanical strength.The bank slope is eroded and accumulated because of periodic geological effect of the river,and the topography is changed in the end,which is the reservoir bank reformation.But current researches about stability of bank slopes don＇t consider the influence of the reformation.Taking a bank slope of Wushan County as an example,this paper analyzes the topographic changes before and after the impoundment.The paper studies the features of groundwater seepage and bank slope stability by numerical simulation.The results show that the topographic changes of different places and different heights are varied as the hydraulic characteristics of surface water.As the reservoir water level goes down,saturation line of the bank slope groundwater decreases gently,but the hydraulic gradient is larger in the abrupt side of the bank slope.Under the same condition,the bank slope whose topographic is changed has higher stability.

关 键 词：岸坡 库岸再造 地形变化 地下水渗流特征 稳定性分析 数值模拟 

分 类 号：X45[环境科学与工程—灾害防治] P642.22[天文地球—工程地质学]