Study On Disaster Control And Relative Problem Of Deep Tunnel With Fracture And Hard Rock

With the continuous increasingly development of national economy, especially the implementation of western development strategy, the economic development of China’s western region runs sharply. Moreover, the demand of infrastructure construction in western region is constantly increasing and the construction of transport facilities is subjected to challenge the brunt. Due to a lot of mountains and hills in China’s western region, it’s common to find many deep buried tunnels during increasing development of the construction of transport facilities. As a result of the large buried depth or the tectonic stress, long and deeply buried tunnel often passes through the high ground stress region under complicated geological conditions.The thesis relies on the longest tunnel which is constructing in China’s western region—Daxiangling tunnel with fracture and hard rock on Yaxi highway in high geo-stress. The maximum buried depth of the tunnel is1648m. Therefore, much risk of rock burst appears during construction. The thesis use distinct element numerical simulation method to research the control method and prediction method of rock burst disaster. And the achievement possesses the guiding significance in engineering and scientific research value. And the main research results are obtained as following:Firstly, distribution of surrounding rock stress was estimated under different conditions, such as different initial ground stress field and joints inclination. In addition, the possibility of tunnel rock burst was predicted with different joints inclination in the measured ground stress field.Second, according to the measured ground stress field in the tunnel site region, the supporting structure force character of deep buried tunnel with fracture and hard rock was estimated. And the achievement will provide the reasonable parameter for support design.Third, under the different initial ground stress field, the stress distribution character of deep buried tunnel surrounding rock with fracture and hard rock was analyzed by means of distinct element method and universal distinct element calculation software UDEC and3DEC, and the prevention and control technologies of rock burst were proposed.Forth, the calculation and analysis of the stress release effect of surrounding rock stress field and the rock burst disaster control effect generated by cave surrounding stress release hole were obtained, and the layout of stress release hole was optimized preliminarily to reduce the degree of rock burst.Fifth, the fracture rock mass seepage flow distribution was performed to identify the influence induced by different joints inclination and different geology model. Furthermore, the tunnel surrounding rock stability was discussed from the view of underground water seepage in the fracture rock mass.