土石坝加固工程中缺陷防渗墙渗流特性研究  

Study on the Permeability of Cut-off Wall with Defects in the Reinforcement Projects of Earth-Rock Dam

作　　者：高江林[1] 严卓 GAO Jianglin YAN Zhuo(Jiangxi Provincial Research Center on Hydraulic Structures, Jiangxi Provincial Institute of Water Science, Nanchang 330029, China Water Resources and Hydropower Design and Research Insititute of Sichuan Province, Chengdu 610072, China)

机构地区：[1]江西省水利科学研究院江西省水工安全技术研究中心,江西南昌330029 [2]四川省水利水电勘测设计研究院,四川成都610072

出　　处：《人民黄河》2017年第9期125-128,134,共5页Yellow River

基　　金：江西省水利厅科技项目(KT201301)

摘　　要：为了研究不同防渗墙质量缺陷对工程渗流特性的影响,以某实际工程为例,采用饱和-非饱和渗流有限元理论,利用ABAQUS有限元程序对土石坝加固工程中防渗墙墙底沉渣、墙体未入岩、墙体渗透系数过大、墙底开叉这几种缺陷进行二维、三维渗透特性分析,结果表明:墙底沉渣对工程渗流特性的影响不大;防渗墙渗透系数须达到设计值,若进一步降低渗透系数,不但增加施工成本和增大技术难度,而且防渗效果未发生明显变化;墙体未入岩明显增大了坝后渗漏量,改变了坝体原有的渗流形态,原因在于防渗墙无法截断坝基覆盖层处的渗流通道;墙底开叉宽度越大,浸润线高度越高,对工程渗透稳定性影响越大。In order to study the influence of the different quality defects of cut-off wall on the engineering seepage stability, it is necessary to simulate the variation of the seepage under different defects of cut-off wall. Taking a hydraulic engineering as a research, based on the partial saturated seepage theory, ABAQUS program was used to analyze the 2D and 3D seepage characteristics of the cut-off wall under wall bottom sediment, suspension of the anti-seepage wall, excessive coefficient of permeability of the wall and split wall. The numerical simulation re- sults show that the defect of sediment has little impact on the seepage characteristic ; that the seepage coefficient of the cut-off wall should be up to the design value, if the seepage coefficient is further reduced, it will not only increase the construction cost and technical difficulty, but also prevent the seepage control effect from changing obviously ; and that the defect of suspension of the anti-seepage wall obviously increases the leakage of dam and changes the original flow pattern of dam, because the defect makes cut-off wall can not interrupt flow passages of dam foundation ; that the greater the slit width, the higher the saturation line is and the greater the impact on the seepage stability of the project.

关 键 词：防渗墙 渗透系数 质量缺陷 饱和-非饱和渗流 

分 类 号：TV543.8[水利工程—水利水电工程] TV641.2