辉绿岩脉复合灌浆试验加固效果研究

 选择代表性试验区，采用高压水泥–化学复合灌浆技术，对辉绿岩脉的灌浆加固处理开展灌浆工艺、加固效果和机制等试验研究。试验中对微细裂隙发育的辉绿岩脉进行高压水泥灌浆后再进行化学复合灌浆，水泥浆液采用普通硅酸盐水泥，化学浆液采用固结性能良好的CW系环氧树脂。复合灌浆后的辉绿岩脉单孔纵波速度可达5 153 m/s，变形模量为11.4～21.8 GPa，试验区岩体的连续性、整体性及均一性改善显著。复合灌浆达到预期效果，辉绿岩脉力学指标满足建坝要求，灌浆工艺参数合理，可直接指导大岗山水电站基础处理施工。经初步探索，该复合灌浆加固岩体的实质可归纳为：固结灌浆改善了岩体结构面力学特征及其组合关系，使其整体刚度增大；微细裂隙的良好胶结，使其端部应力集中被降低或消除，岩体屈服极限增大，强度提高。

EXPERIMENTAL RESEARCH ON REINFORCEMENT EFFECT OF COMPOUND GROUTING ON DIABASE DIKES

Selecting the representative test area，the technology of high-pressure cement-chemical compound grouting is adopted to carry out experimental research on grouting reinforcement treatment of diabase dikes for determining grouting technique，and the effect and mechanism of reinforcement，etc.. During the test，microcracks are developed in the diabase dikes；and the high-pressure cement grouting has been adopted firstly. The material of cement slurry adopts ordinary Portland cement；and the material of chemical grouting is epoxy resin with super consolidation performance，which belongs to the CW series. After the compound grouting，the single P-wave velocity of diabase dikes can reach 5 153 m/s；and its deformation modulus is in the range of 11.4–21.8 GPa；the continuity，entirety and uniformity of rock mass in the test area are improved significantly. The compound grouting achieves the desired results；and the mechanical parameters of dikes satisfy the demands of dam construction. The parameters of grouting technique are also reasonable，which can directly guide the foundation treatment construction of Dagangshan hydropower station. After some preliminary explorations，the essence of the cement- chemical compound grouting for reinforcing the rock mass can be summarized as follows. After consolidation grouting，both the mechanical characteristics of structural plane of rock mass and its combination relationship are improved；and then its integral rigidity is enhanced. It is the fine cementation of microcracks so as to reduce or eliminate the stress concentration on their ends intensively. Thus，the limit yield of rock mass and its strength are both enhanced.