Study on Structural Stability of High Stress Soft Rock Roadway

摘要

In crack soft rock roadway with high stress, a significant reason that the deformation of surrounding rock around roadway is still difficult controlled by the existent support technology is the instability of support structure. The field measurement, numerical simulation and theoretical analysis are used. The structural stability of various types of supports in such roadway is analyzed in detail. The support structure steadied mechanism and technology for improving the stability of support structure is put forward. This provides a theoretical guidance for using new support technology which has larger support resistance and steadier support structure. The results show that anchoring force have a cycle declining phenomenon with the surrounding rock deformation, and it is difficult to form a reliable bearing structure by bolt and steel mesh in crack soft surrounding rock around roadway with high stress. Low intensity of connections, irrationality structure of connections poor interaction between rock and frame, and the feature that frame don't suit the surrounding rock deformation characteristic etc., easily result in structural instability of U-steel frame. Coupling the frame and anchor cable together, utilizing bearing structure which forms by U-steel frame, the device of steadying structure is rationally laid to structurally compensate to frame according to the deformation characteristics of surrounding rock and the structural instability type of U-steel frame. It consumedly improves the whole bearing capacity and structural stability of U-steel frame, and effectively controls the strong deformation of such surrounding rock.