水泥–化学复合灌浆在断层补强中的应用效果评价

锦屏I级水电站f2断层及两侧挤压错动带内岩体破碎、力学性能较差、抗渗指标低，对坝基的承载能力影响较大，工程实践过程中采用水泥–化学复合灌浆对其进行加固处理。通过现场声波、孔内变形模量测试及室内物理力学试验，对灌后岩石的孔隙率、抗压强度及抗剪强度等主要指标进行研究。结合扫描电镜(SEM)手段，分析灌后岩石的细部结构特征及化学浆液充填情况，综合试验检测数据对水泥–化学复合灌浆对断层处理的效果进行评价。研究结果表明：灌后f2断层岩体声波波速、抗剪强度提高较为明显，达到设计要求。化学浆液在微裂隙中填充饱满，最小可灌入0.01 mm的裂隙。水泥–化学复合灌浆技术可使断层破碎岩体的完整性及力学性能得以改善，是处理岩体软弱结构面一种有效方法。

EVALUATION OF APPLICATION EFFECT OF CEMENT-CHEMICAL COMPOUND GROUTING IN FAULT REINFORCEMENT

The broken rock masses with poor mechanical and permeability properties in fault f2 at Jinping I hydropower station have an adverse effect on the bearing capacity of foundation；and cement-chemical compound technology was used to reinforce it in the engineering practice. Through the wave velocity，deformation modulus in hole and physico-mechanical test in laboratory，the major indexes such as porosity，compressive and shear strengths have been deeply studied. Furthermore，the scanning electron microscope(SEM) was adopted to analyze the microstructure and the filling situation of rock after grouting. Experimental results show that wave velocity and shear strength of rock mass in fault are increased obviously and meet the requirement of design；microcracks in rock are well filled by chemical material；and the minimum crack is only 0.01 mm. The cement-chemical compound grouting technology can improve the integrity and mechanical properties of the rock mass in fault zone；and it is an effective method to reinforce weak structural plane in rock masses.