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。
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.
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
Key words
flexural core fracture zone /
cement-epoxy resin compound grouting /
fatigue water pressure test /
acoustic wave test /
CW510 grouting materials
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 尹作仿,董建军. 三峡F215断层化学灌浆现场试验研究[J]. 长江科学院院报,2000,17(6):12-14. (YIN Zuo-fang, DONG Jian-jun. In-situ Test on Chemical Grouting for Three Gorges Fault F215[J]. Journal of Yangtze River Scientific Research Institute, 2000,17(6):12-14.(in Chinese))
[2] 董建军,魏 涛,吕书云. 三峡工程F1096断层复合灌浆处理技术[J]. 长江科学院院报,2005,22(2):35-38. (DONG Jian-jun, WEI Tao, LV Shu-yun. Treating Technique on Composite Grouting at Fault F1096 of TGP[J]. Journal of Yangtze River Scientific Research Institute, 2005, 22(2): 35-38. (in Chinese))
[3] 范光华. 化学灌浆技术在锦屏一级电站工程中的试验研究[J]. 广西水利水电,2008,(3):8-11. (FAN Guang-hua. Chemical Grouting Technique Testing and Research at Jingpin I HPP[J]. Guangxi Water Resources & Hydropower Engineering, 2008, (3): 8-11. (in Chinese))
[4] 周维垣,杨若琼,刘公瑞. 二滩拱坝坝基弱风化岩体灌浆加固效果研究[J]. 岩石力学与工程学报,1993,12(2):138-150. (ZHOU Wei-yuan, YANG Ruo-qiong, LIU Gong-rui. Study on the Efficacy of Grouting Reinforcement of Slightly Weathered Rock Masses at the Ertan Arch Dam Abutments[J]. Chinese Journal of Rock Mechanics and Engineering, 1993,12(2):138-150. (in Chinese))
[5] 温 帅,汪家林,刘道华,等. 辉绿岩脉复合灌浆试验加固效果研究[J]. 岩石力学与工程学报,2009,28(6):1231-1238. (WEN Shuai, WANG Jia-lin, LIU Dao-hua, et al. Experimental Research on Reinforcement Effect of Compound Grouting on Diabase Dikes[J]. Chinese Journal of Rock Mechanics and Engineering, 2009,28(6):1231-1238. (in Chinese))
[6] 葛洲坝集团股份有限公司向家坝施工局. 向家坝水电站二期工帷幕灌浆和固结灌浆试验施工总结报告[R].宜宾:葛洲坝集团股份有限公司向家坝施工局, 2010.(Xiangjiaba Construction Bureau of Gezhouba Dam Group Limited. Construction Report of Curtain Grouting and Consolidation Grouting Tests in Second Stage of Xiangjiaba Hydropower Station[R]. Yibin:Xiangjiaba Construction Bureau of Gezhouba Dam Group Limited,2010. (in Chinese))
[7] 魏 涛,汪在芹,薛希亮,等. CW系化学灌浆材料的研制[J]. 长江科学院院报,2000,17(6):29-31. (WEI Tao, WANG Zai-qin, XUE Xi-liang, et al. Development of CW Chemical Grouting Material[J]. Journal of Yangtze River Scientific Research Institute, 2000, 17(6):29-31. (in Chinese))
PDF(1207 KB)
