河口村水库初期蓄水渗漏与变形安全评价
2017-07-21刘耀宗翟春明李陆明
刘耀宗++翟春明+李陆明

【摘要】河口村水库大坝为混凝土面板堆石坝,自2014年9月25日正式开始下闸蓄水,大坝目前发现三段渗水处,渗水量占沁河多年平均径流量的0.93%。大坝整体最大沉降量占坝高(含基础)的0.74%,坝体及坝基变形趋于稳定。坝肩绕渗测压管水位和上游水位总体变化正常,随上游水位的变化而变化。坝基应力均处于受压状态,混凝土面板大部分呈受压状态,防渗墙钢筋拉、压应力均有,但应力值普遍较低,总体变化较小。根据对坝体、坝基、混凝土面板及防渗墙的变形、应力及渗漏情况分析,大坝目前工作状态正常,大坝是安全的。
【关键词】渗漏;变形;评价包含
【Abstract】Hekoucun Reservoir is a concrete face rockfill dam. Three water penetration points have been found since September 25, 2014, the official start of the brake under water. The water seepage flow account for 0.93 percent of annual average runoff volume of Qin river. The maximum settlement value of the dam account for 0.74 percent of the dam height (include basic). The deformation of the dam body and the dam foundation have been stabilized. The change of the piezometric level and the upper level is normal along with the change of the upper level. Stress in the dam foundation and the concrete face is in a state of compression. There are tensile stress and pressure stress in the rebar of the diaphragm wall, but the stress value is low general and the change is less overall. According to the transformation and stress of the dam body , the dam foundation, the concrete face and the diaphragm wall, working condition of the dam is normal. The dam is safe.
【Key words】Leakage;Deformation;Assessment
1. 工程概況
(1)村水库位于黄河一级支流沁河上,控制流域面积9223 Km2,是控制沁河洪水的关键工程,也是黄河下游防洪工程体系的重要组成部分。河口村水库以防洪供水为主,兼顾灌溉、发电、改善下游生态基流。
(2)河口村水库工程规模为大(2)型,工程等别为Ⅱ等,由大坝、泄洪洞、溢洪道及引水电站组成,总投资约27.75亿元,总工期60个月。水库按500年一遇设计,2000年一遇校核,设计(校核)水位285.43 m,正常高水位275.0 m,死水位225.0 m,总库容3.17亿 m3。
2. 坝址区地质概况
2.1地质概况。
(1)大坝左右岸地层由馒头组板状白云岩、泥灰岩及页岩、汝阳群石英砂岩及登封群花岗片麻岩及第四系覆盖层组成。左坝肩属褶皱断裂发育区,构造发育,岩体破碎,F11、F12、F14断层、龟头山褶皱束分布在其间其次左坝肩分布有古滑坡体及其他第四系堆积物。右岸坝肩存在寒武系∈1m3地层易风化、泥化及发育岩溶现象,易产生渗漏。……
