Abstract: One of the points in our studying chemical grouting is to use organic compounds as bedrock consolidation grouting materials. This article describes how after consolidation treatment of moderately weathered quartzdiorite zone at a dam site by the use of methacrylate chemical grouts modulus of deformation was increased from 26.3×10~4 kg/ cm2 to 47.4×10~4 kg/cm2; static elastic modulus was increased from 29.6×10~4 kg/cm2 to 57.9×10~4 kg/cm2; the speed of sound wave, Vp, from 4894 m/s to 5272 m/s; and dynamic elastic modulus from 53.4×104~ kg/cm2 to 62.4 × 10~4 kg/cm2; unit water absorption ω was reduced from 0.035 1/min to 0.012 1/min and adhesive strength of fissure was increased from O to 13.4 kg/cm2.