Study On Damage-Failure Effect And Non-Harmonious Control Mechanism Of Weak Structure Of Surrounding Rocks Of Roadways

This dissertation, based on a lot of on-site observations, theoretical analyses and numerical simulations, discusses the failure and stability-losing processes of weak structure and non-harmonious control of surrounding rocks of roadways all-sidedly and systematically. It puts forward the concepts of weak structure and weak structure body of surrounding rocks of roadways according to the occurrence inhomogeneity and non-equilibrium of deformation failure of rocks surrounding the underground projects. Proceeded from the study of the plasticity deformation area and the shape of fractural zone development in surrounding rocks it studies the relations among the plastic deformation area of surrounding rocks and the shape of fractured zone as well as types of weak structure of roadways, and singularity of failure area in roadways with weak structure. Regarded the deformation failure of weak structure body as the main idea and proceeded from the compound structure, branching theory and weak structure effect, it stresses on the study of the influences of failure of weak structure body on the stability of roadways with weak lithology structure, weak geometry structure and weak stress structure. In favor of control of surrounding rocks, it proposes the optimum alternatives for selecting the weak lithology structure under different stress conditions of surrounding rocks and it puts forward the concepts of "control location" of deformation failure in weak structure body and "non-harmonious control" of surrounding rocks on the basis of deformation failure laws and failure effect in different types of weak structures. The main control nature of failure of surrounding rocks of roadways with weak structure and the mechanical response of weak structure which matches supporting method as well as the mechanism of non-harmonious control and control methods are studies, forming the preliminary theoretical system of non-harmonious control of rocks surrounding the roadways.