水位下降对堤防边坡稳定性影响研究  

Study on Stability of Embankment Slope under Different Drawdown Conditions

作　　者：李鸿娟 徐啸川 LI Hongjuan;XU Xiaochuan(The Fourth Geological Exploration Institute of Henan Geology and Mineral Bureau,Zhengzhou 472000,China;School of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]河南省地质矿产勘查开发局第四地质勘查院,河南郑州472000 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《粉煤灰综合利用》2024年第2期31-38,74,共9页Fly Ash Comprehensive Utilization

基　　金：国家自然科学基金项目(51779155)。

摘　　要：为研究水位下降速度对堤防边坡稳定性的影响,选取松花江某段堤防断面作为模型试验设计断面,通过室内模型试验,利用地形自动测量系统和高精度传感器对不同水位下降速度下堤防边坡的位移、孔隙水压力和土压力进行监测,同时利用Geo-Studio软件对不同水位下降速度条件下的堤防边坡浸润线与稳定性进行分析。研究表明:堤防内部的土水总应力与孔隙水压力均随水位的下降而下降,下降速度随着水位下降速度的增大而增大,且靠近上游坡面处的下降幅度大于坡体内部,有效应力呈上升趋势,当水位下降至坡底后,土水总应力与孔隙水压力的下降速度开始逐渐减小;堤防迎水坡发生最大沉降的位置主要集中水位与边坡交界附近,在边坡中部位置出现了较大的拱起位移,且随水位下降速度增大,边坡最大沉降和最大拱起位移均呈现增大的趋势;堤防边坡的稳定性系数随水位下降先快速下降,稳定性系数的下降速度随水位下降速度的增大而增大,当水位下降至坡脚后,边坡稳定性系数逐渐增大,然后趋于不变,不同水位下降速度工况下边坡最终达到的稳定性系数基本一致。In order to study the influence of water level drawdown speed on the stability of embankment slope,this paper selects a section of the Songhua River embankment section as a model test design section.Through indoor model tests,the displacement,pore water pressure and earth pressure of embankment slope under different water level drawdown speeds are monitored by using automatic terrain measurement system and high-precision sensors,At the same time,Geo-Studio software was used to analyze the infiltration line and stability of embankment slopes under different water level drop rates.Research shows that:The total soil water stress and pore water pressure inside the embankment decrease with the decrease of water level,and the decrease rate increases with the increase of water level decrease rate.The decrease amplitude near the upstream slope surface is greater than that inside the slope body,and the effective stress shows an upward trend.When the water level drops to the bottom of the slope,the decrease rate of total soil water stress and pore water pressure begins to gradually decrease.The location where the maximum settlement occurs on the upstream slope of the embankment is mainly concentrated near the boundary between the water level and the slope.There is a significant arch displacement in the middle of the slope,and as the water level decreases,both the maximum settlement and arch displacement of the slope show an increasing trend.The stability coefficient of the embankment slope first rapidly decreases with the decrease of water level,and the decreasing speed of the stability coefficient increases with the increase of water level decreasing speed.When the water level drops to the foot of the slope,the stability coefficient of the slope gradually increases,and then tends to remain unchanged.The stability coefficient of the slope ultimately reaches the same level under different water level decreasing speed conditions.

关 键 词：堤防边坡 水位下降速度 模型试验 数值模拟 边坡稳定性 

分 类 号：TV697.23[水利工程—水利水电工程]