锦屏一级水电站左岸卸荷拉裂松弛岩体灌浆加固研究

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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30～90 min，初凝90～210 min，终凝130～290 min，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。

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关键词 ：岩石力学, 卸荷拉裂岩体, SJP&ndash, 1型灌浆材料, 溶剂化膜, 灌浆加固

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.

Key words： rock mechanics unloading fractured rock mass SJP&ndash 1 grouting material theory of solvability film grouting reinforcement

收稿日期: 2010-10-09

引用本文:

裴向军1，黄润秋1，李正兵2，罗建林2. 锦屏一级水电站左岸卸荷拉裂松弛岩体灌浆加固研究[J]. 岩石力学与工程学报, 2011, 30(2): 284-288.
PEI Xiangjun1，HUANG Runqiu1，LI Zhengbing2，LUO Jianlin2. RESEARCH ON GROUTING REINFORCEMENT OF UNLOADING FRACTURED LOOSE ROCK MASS IN LEFT BANK OF JINPING I HYDROPOWER STATION. , 2011, 30(2): 284-288.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I2/284

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