锦屏一级水电站左岸卸荷拉裂松弛岩体灌浆加固研究  

RESEARCH ON GROUTING REINFORCEMENT OF UNLOADING FRACTURED LOOSE ROCK MASS IN LEFT BANK OF JINPING I HYDROPOWER STATION

作　　者：裴向军[1] 黄润秋[1] 李正兵[2] 罗建林[2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]中国水利水电第七工程局有限公司,四川成都610034

出　　处：《岩石力学与工程学报》2011年第2期284-288,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40402025);国家自然科学基金委员会;二滩水电开发有限公司雅砻江水电开发联合研究基金项目(50539050);成都理工大学地质灾害防治与地质环境保护国家重点实验室自由探索基金项目(SKLGP2009Z009)

摘　　要：针对强卸荷、松弛拉裂、强震损伤岩体灌浆加固工程中陡倾裂隙面浆液漏量大、加固效果差的技术难题,研发SJP–1型黏度时变型水泥–化学浆液(水灰比0.6);探讨高分子外掺剂对水化硅酸钙生成速度的影响;提出水泥–化学浆液的溶剂化膜理论。研究结果表明:新型水泥–化学浆液可泵期30～90min,初凝90～210min,终凝130～290min,后期强度高出普通水泥浆10%～20%。SJP–1型浆液可避免速凝水泥浆早期强度高、后期强度低的缺陷,并成功地应用于锦屏一级水电站卸荷拉裂岩体和汶川地震灾区损伤岩体的灌浆加固工程。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.

关 键 词：岩石力学 卸荷拉裂岩体 SJP–1型灌浆材料 溶剂化膜 灌浆加固 

分 类 号：TU45[建筑科学—岩土工程]