Study On Disaster Control And Stability Of Surrouding Rock With Fracture Rock In Complicated Geographical Mountainous Areas

With the constant development of high-speed railway construction in China, the construction of long and deep tunnel is increasingly growing in number and becomes more dangerous due to the rough topographic condition. Meanwhile, the hydrogeology and engineering geological condition where the tunnel crossing will be more and more conplicated. Regarding the deep tunnel with fracture rock as the research subject, this paper mainly studies mechanical behaviours of the bedded and cataclastic soft rock influenced by the disturbance of construction. Based on the back analysis and research of the primary stress field in the tunnel site area, it gives an overall prediction on rockburst probability and intensity of the whole tunnel area in the process of tunnel excavation. Also, it studies the macroscopic seepage field distribution of the whole tunnel area and the seepage characteristics of fractured rock tunnel.The main research results are as follows:1. The paper studies on weak surrounding rock deformation of the bedded and cataclastic soft rock after tunnel excavation. Through discrete element software simulation analysis, it reveals the mechanical characteristics of bedded and cataclastic surrounding rock influenced by the disturbance of construction under different condition of different joint angle and distance. It also studies on the dynamic deformation characteristics and supporting structure dynamic stress characteristics of surrounding rock.2. According to the ground stress measurement data of tunnel site area field, using the finite element regression analysis, the initial ground stress field can be got by back analysis and the three-dimensional initial stress field of tunnel site area can be established. It lays the foundation for the next step—forecast of fracture rockburst.3. The paper gives an overall prediction on rockburst probability and intensity of typical tunnel sections which are under the condition of high ground stress after tunnel excavation. According to the prediction of rock burst intensity level, corresponding safety-control measures are put forward.4. The paper put a research on the macroscopic seepage field distribution of tunnel area with fractured rock. It gets the groundwater seepage field and its distribution rule of the tunnel area before excavation and after whole construction. Besides, it gains the fractured rock seepage characteristics of groundwater in different joint conditions.