|
|
|
| RESEARCH ON GROUTING REINFORCEMENT OF UNLOADING FRACTURED LOOSE ROCK MASS IN LEFT BANK OF JINPING I HYDROPOWER STATION |
| (1. State Key Laboratory of Geo-hazards Prevention and Geo-environment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. Sinohydro Bureau 7th Co.，Ltd.，Chengdu，Sichuan 610034，China) |
|
|
|
|
Abstract Based on the technical problems of the grouting fluid flowing along the steep crack faces and the poor reinforcement effects in the grouting reinforcement projects for strong unloading，loose and damaged rock mass induced by the strong earthquake，the SJP–1 aging strengthening cement-chemical grout is developed. The effect of the high-molecular compound additive on the formation rate of calcium silicate hydrate is discussed；and a new theory of solvability film of cement-chemical grout is proposed. The experimental results indicate that the pumpability period of the new cement-chemical grout is 30–90 minutes，initial setting time is 90–210 minutes，final setting time is 130–290 minutes，and the long-term strength of SJP–1 cement-chemical grout is about 10%–20% higher than that of the ordinary cement grout. SJP–1 cement-chemical grout can solve the shortcomings of the higher early strength and the lower long-term strength for the quick setting cement grout，and can reduce the construction cost. Finally，the SJP–1 cement-chemical grout is used successfully in the grouting reinforcement projects for damaged rock masses of Jinping I hydropower station and Wenchuan earthquake disaster area.
|
|
Received: 09 October 2010
|
|
|
|
| [1] 宋胜武，向柏宇，杨静熙，等. 锦屏一级水电站复杂地质条件下坝肩高陡边坡稳定性分析及其加固设计[J]. 岩石力学与工程学报，2010，29(3)：442–458.(SONG Shengwu，XIANG Baiyu，YANG Jingxi，et al. Stability analysis and reinforcement design of high and steep slopes with complex geology in abutment of Jinping I hydropower station[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：442–458.(in Chinese))
[2] 黄润秋，林 峰. 岩质高边坡卸荷带形成及其工程性状研究[J]. 工程地质学报，2001，9(3)：228–232.(HUANG Runqiu，LIN Feng. Formation mechanism of unloading fracture zone of high slopes and its engineering behavior[J]. Journal of Engineering Geology，2001，9(3)：228–232.(in Chinese))
[3] 罗平平，朱岳明，赵咏梅，等. 岩体灌浆的数值模拟[J]. 岩土工程学报，2005，27(8)：918–921.(LUO Pingping，ZHU Yueming，ZHAO Yongmei，et al. Numerical simulation of grouting in rock mass[J]. Chinese Journal of Geotechnical Engineering，2005，27(8)：918–921. (in Chinese))
[4] 陈 文，刘永球，仇学明. 锦屏水电站左岸帷幕灌浆试验与分析[J]. 水利水电技术，2008，39(9)：22–25.(CHEN Wen，LIU Yongqiu，QIU Xueming. Experiment and analysis of curtain grouting on left bank of Jinping hydropower station[J]. Water Resources and Hydropower Engineering，2008，39(9)：22–25.(in Chinese))
[5] 李小波，吴 莉，祝华平. 锦屏一级水电站左岸深部裂缝岩体灌浆试验研究[J]. 水电站设计，2009，(1)：54–56.(LI Xiaobo，WU Li，ZHU Huaping. Experimental study on rock grouting for deep crack in left bank of Jinping hydropower station[J]. Design of Hydroelectric Power Station，2009，(1)：54–56.(in Chinese))
[6] NONVEILLER E. Grouting theory and practice[M]. Netherlands：Elsevier，1989.
[7] COULTER S，MARTIN C D. Single fluid jet-grout strength and deformation properties[J]. Tunnelling and Underground Space Technology，2006，21(6)：690–695.
[8] 王继敏，蒋学林. 锦屏一级水电站煌斑岩脉水泥化学复合灌浆试验研究[J]. 长江科学院院报，2010，27(2)：60–63.(WANG Jimin，JIANG Xuelin. Compound cement and chemical grouting trial and study on Jinping I stage hydropower project[J]. Journal of Yangtze River Scientific Research Institute，2010，27(2)：60–63.(in Chinese)) |
|
|
|
2011, Vol. 30 
