Study On Stability And Rock Control Of Underground Engineering Structure In Cataclastic Rocks

With the rapid development of the underground structure, various underground projects come out. In the course of the underground construction, deformation in rock mass will produce cranny and crack. In some conditions, underground structure lost stability. Therefore, study for stability of wall rock makes an important sense to underground structure.Because of the complexity of geological condition and underground structure, it is very difficult by using the theory analysis method to carry on the project's stability analysis and calculation. In recent years, along with the rapid development of computation mechanics, numerical methods and computer technology, the numerical simulation method has become an important tool to research on underground structure.In this thesis, based on the study of underground structure in some GUANGXI mine, a series of research aimed at stability of wall rock in cataclastic rocks is developed.Firstly, essential and characteristic of underground structure rock mass are analyzed, and expound rock mass destroy mechanism and stability criterion. Then, on the basis of geological conditions of mine, the construction of underground in cataclastic rocks is simulated by using Distinct Element Method, so the stress state, plastic zone distribution and deformation characteristic were obtained. Finally, bolt support is set up in deformed rock mass, four different bolt support schemes is simulated, compare this schemes, and choose the best reasonable scheme, ensure the stability of underground structure.According to stability research of underground structure rock and rock control technique, use various methods, analyze the theory and numerical simulation technique of rock mass, chooses the reasonbable scheme. The scheme improves the rock stress and increases the stability of underground engineering. The result offer the theory basis to excavate the underground project in cataclastic rocks. The analysis of influence on stability by bolt support provides theoretic reference for digging and initial support in underground project, plays a key role in preventing engineering accidents, and has important theoretical and realistic meaning.