Study On The Stability And Reasonable Supporting Schemes For Soft-weak Surrounding Rock

With the expanding of the underground construction projects, soft rock problem has been related to the transportation, electricity, and rural construction, mining and other fields, the stability of the soft and the support method has become the problem that needs to solve in underground work.This paper biases the actual support damage case in the soft rock tunnel to discusse the geological features and engineering features of the soft rock, the destruction of the characteristics of mechanical factors, deformation mechanisms, the principle of supporting and so on; The Interaction between surrounding rock and primary support is also discussesed mainly in this paper. Finding out the effect to tunnel stability from different strength of surrounding rock and support parameter has some guiding significance in complicated geological tunnel construction. Using FLAC program, carried out numerical simulation of tunnel surrounding rock, using the typical cross-section as an example, analysis support method is reasonable or not, support scheme is safe and economic or not, and determine the level of surrounding rock. Focused on analyzing the deformation characteristics of the surrounding rockunder the role of self-weight stress field, surrounding rock stress distribution when using different supporting scheme. And came to the stability of surrounding rock comprehensive evaluation and treatment measures for the entire tunnel, have important guiding significance to the tunnel to determine the actual level and design the rock supporting program.By analyzing the measured data monitoring, mapping the convergence rate increases with the time curve, to find out the deformation and stability of the law. Of the landslide area processing and disposal after the end of the field data analysis, can give the tunnel collapse disasters treatment measures to provide timely feedback, and monitoring results can also make a direct evaluation of disposal effect of landslides, tunnel collapse treatment measures effective.