Abstract: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.