长江科学院院报 ›› 2015, Vol. 32 ›› Issue (7): 105-108.DOI: 10.3969/j.issn.1001-5485.2015.07.019

• 水工结构与材料 • 上一篇    下一篇

向家坝水电站挠曲核部破碎带水泥-环氧树脂复合灌浆试验研究

魏涛1, 2, 张健1, 2, 陈亮1, 2, 肖承京1, 2   

  1. 1.长江科学院 材料与结构研究所,武汉 430010;
    2.三峡地区地质灾害与生态环境湖北省协同创新中心,湖北 宜昌 443000
  • 收稿日期:2014-01-06 出版日期:2015-07-01 发布日期:2015-07-07
  • 作者简介:魏涛(1964-),男,河南邓县人,教授级高级工程师,主要从事水电工程修补加固和新材料开发工作,(电话)15972018245(电子信箱)wxt20081@163.com。
  • 基金资助:
    国家自然科学基金项目(51378078)

Cement-epoxy Resin Grouting Treatment for the Flexural Fracture Zone in Xiangjiaba Hydropower Station

WEI Tao1,2, ZHANG Jian1,2, CHEN Liang1,2, XIAO Cheng-jing1,2   

  1. 1.Materials and Engineering Structure Department, Yangtze River Scientific Research Institute, Wuhan 430010, China;
    2.Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area, Yichang 443000, China
  • Received:2014-01-06 Online:2015-07-01 Published:2015-07-07

摘要: 向家坝水电站坝址岩性岩相多变,地质条件非常复杂,坝右岸存在挠曲核部破碎带,对大坝的渗透稳定非常不利。现场施工发现水泥灌浆难以对坝基存在的挠曲核部破碎带进行有效处理,为解决挠曲核部破碎带地质缺陷,长江科学院在右岸二期基坑高程257 m平台进行了水泥-环氧树脂复合灌浆试验。灌后检查显示:透水率由复合灌浆前的平均透水率3.05 Lu降为0.075 Lu,做全压力为2.265 MPa的疲劳压水试验,经72 h透水率为0 Lu;水力破坏坡降比灌前提高了11.54倍;灌浆后平均波速比灌前提高16.8%。试验结果表明:湿磨细水泥-环氧树脂同孔复合灌浆的工艺是可行的,CW510环氧树脂灌浆材料能够浸润和渗透到挠曲核部破碎带不良地质体中,试验中所获得的工艺参数可以在向家坝水电站挠曲核部破碎处理中推广应用,并可为其他水工建筑物基础处理借鉴。

关键词: 挠曲核破碎带, 水泥-环氧树脂同孔复合灌浆, 疲劳压水试验, 声波测试, CW510环氧树脂灌浆材料

Abstract: The geological conditions of Xiangjiaba hydropower station is very complicated with a flexural core fracture zone at the right side of dam foundation, detrimental to the seepage stability of the dam. It’s hard to mend these geological defects such as siltstone and argillaceous siltstone with cement grouting . In view of this we conducted test on platform at elevation 257m on the right bank of second-stage foundation pit using cement-epoxy resin grouting to mend the geological defects. The quality inspection results after grouting are as follows: water permeability reduced from 3.05 Lu to 0.075 Lu; the water permeability of fatigue water pressure test with full pressure of 2.265 MPa is 0 Lu after 72h; the gradient of hydraulic damage is 11.54 times higher than that before grouting; the average wave velocity improved by 16.8% over the previous grouting. The test results indicate that the treatment of cement-epoxy resin compound grouting for flexural core fracture zone in Xiangjiaba Dam is feasible, and could be used for reference by similar hydraulic structures with fracture zone. CW510 grouting materials could penetrate into the flexural core fracture zone.

Key words: flexural core fracture zone, cement-epoxy resin compound grouting, fatigue water pressure test, acoustic wave test, CW510 grouting materials

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