裂隙岩体注浆后结构面粗糙度及刚度变化分析

摘要

Structure surface is an important factor in controlling rock property. In order to improve the rock properties of physical and mechanical, grouting technique is often applied in engineering. The structure surface of JRC-JCS model was studied. Based on it, comparison study was carried out before and after grouting of the rock structure on the surface. Studies show that JRC of surface structure greater increase than natural after the end of grouting. While the growth trend changes with the change of normal stress. After grouting the stiffness and shear strength of structure surface is improved, and the stiffness improvement is more apparent The research results further prove that strength of fractured rock increase after grouting%节理面是控制岩体特性的一个重要因素,为改善岩体物理力学特性,工程中经常采用注浆加固的手段.研究了节理面JRC - JCS模型,并在此基础上对注浆前后的岩体节理面进行了相应的对比试验研究.研究表明:注浆后节理面JRC比自然节理面有较大的提高,同时增长趋势随法向应力的改变而改变,裂隙岩体注浆后裂隙面的刚度及抗剪强度参数得到相应的改善,其中刚度参数的改善更为明显.上述研究成果从试验及理论分析的角度进一步证明了裂隙岩体注浆加固后强度提高的机理.