摘要
为研究水位急剧变化对库岸边坡稳定性的影响,文章依托三峡库区涉水滑坡段,在对长江三峡地区滑坡地质灾害进行分类的基础上,通过利用FLAC3D软件对于滑坡体进行流固耦合试验,选择水库蓄水、降低水库水位等因素来研究滑坡体的稳定性。据分析得出结果:当水库初始蓄水位为135.00m、160.00m、175.00m时,滑坡体的稳定系数分别为1.043、1.003、1.074,处于不稳定的状态,同时,其最大位移分别为2.30cm、5.74cm、3.44cm。当水库储水时,滑坡前、中间部分和最终部分的间隙水压的变化是完全不同的。前缘受水位上升和下降的影响很大,往后缘方向水位升降的影响逐渐下降。地面滑坡前的间隙水压差在降水中比较大,中心小,后缘弱,水位突然下降对前缘影响很大。所得结论对于今后类似的地质灾害预警具有重要的参考价值。
The paper is based on a wading landslide section of Three Gorges Reservoir Region,the landslide geological disasters of the Yangtze River Three Gorges Reservoir Region are classified,FLAC3D software is utilized for fluid-solid coupling experiment of the landslide mass on the basis for studying the influence of water level rapid changes on the stability of the reservoir bank slope.Reservoir water storage,reservoir water level reduction and other factors are selected to study the stability of the landslide mass.The results are obtained according to the analysis:when the initial water storage level of the reservoir is 135.00m,160.00m and 175.00m,the stability coefficient of the landslide mass is 1.043,1.003 and 1.074 respectively,and it is in an unstable state.Meanwhile,its maximum displacement is 2.30cm,5.74cm and 3.44cm respectively.The variation of interstitial water pressure is completely different in the front,middle and final part of the landslide when the reservoir is used for storing water.The leading edge is greatly affected by the variation of the water level,while the influence of the water level variation in the back edge direction is gradually decreased.The interstitial water pressure difference in front of the ground landslide is relatively large during precipitation,which is small in the center and weak in the back edge.The sudden drop of the water level has a great influence on the leading t edge.The conclusion thereof has important reference value for the early warning of similar geological hazards in the future.
作者
胡正
刘磐
薛凯
HU Zheng;LIU Pan;XUE Kai(Henan Yellow River Survey,Planning,Design and Research Institute Co.,Ltd.,Zhengzhou 450003,China)
出处
《中国水能及电气化》
2021年第7期57-62,37,共7页
China Water Power & Electrification
关键词
三峡库区
水位升降
边坡稳定
流固耦合
数值分析
Three Gorges Reservoir Region
water level variation
slope stability
fluid-solid coupling
numerical analysis
