Stability Analysis And Support Technology Research Of Rock Foundation Pit In Jinan City

This writing term paper put the geological environment as the background of the jinan city, combining the idea of the "theory" and "numerical simulation", analysing rock excavation of foundation pit in jinan city types, the characteristics of the layered rock foundation pits, the deformation mechanism and destruction mode, evaluation of stability theory, the supporting technology method, compared the research as a system.(1) Through the analysis of the formation of rock mass, rock mass structure, environment, rock mass structural plane of rock mass, the engineering characteristics of underground rock mass in jinan city was analyzed.(2) According to different rock excavation slope angle, the tendency and rock foundation pit side wall inclination anglet, the rock foundation pits divided into different types.(3)Through the mechanical analysis of rock deformation process, put forward the basic combination of five kinds of rock mass deformation and six kinds of foundation pit destruction mode.(4)Using the limit equilibrium method and the relevant mechanics method, analysis the stability the six kinds of foundation pit failure mode(plane sliding, circular sliding wedge failures, the, dumping, pit wall damage, uplifts of damage), and the corresponding stability coefficient calculation formula was deduced.(5) Using FLAC3 D numerical simulation software, to simulate the rock foundation pit excavation process, analyzes the rock of jinan city and the foundation pit on the surface of the wall along the structure stress changes. At the same time, analysising the influence on the structure surface parameters and the corresponding relations between the critical stability of foundation pi.(6) Of the supporting technology of the rock foundation pits in jinan city, analyzes the factors when designing foundation pits, and puts forward the effective support measures, including the bolt(anchor) support(including: non prestressed, composite wall support by rockbolt and shotcrete support by rockbolt and shotcrete, prestress, anchor ribbed beam support by rockbolt and shotcrete support), miniature pile support, and so on.