The Research Of Model Experiment And Numerical Simulationof Tunnel Excavation CityBased On Techtonic Stress

In recent years, among the civil engineering construction, the development and utilization of much tunnel and underground engineering, has effectively promoted the rapid development of the harmonious society with construction and achieved remarkable economic and social benefits. The tunnel and underground engineering technology is the potential resource on the development and utilization of the crust, and it can much more realize the demands of engineering convenience, energy saving, environmental protection, safety, and economy. However, due to the complicated geological conditions, the development of the tunnel technology and the development of the tunnel construction in a certain degree of are not harmonious, which is easily prone to swap blocks, the tunnel collapse and other disasters during the tunnel construction. Tectonic stress is the main factor among affecting the stability of tunnel surrounding rock and generates a lot of influence on determining tunnel excavation supporting. Thus we realize the characteristics of tunnel excavation supporting mechanics which is affected by tectonic stress is a neglectable problem.This thesis ,aiming to tectonic stress effecting on tunnel excavation supporting problem, relying on Liaoning red river nuclear tunnel construction engineering, and using finite element software Phase2D, analysed the stability of surrounding rock of tunnel excavation and supporting under the tectonic stress influence, obtained the rule of surrounding rock tunnel excavation and the teams under different tectonic stress, reveals the distribution characteristics of the different Stress field of rock stress and Stress field of rock-bit. According to the similarity theory, we carried out the physical model test, and through the simulation of tectonic stress influencing on surrounding rock's stability, understanded the deformation and damage law and the damage model of the tunnel surrounding rock under the action of the tectonic stress; Meanwhile, certifying with the numerical simulation results verified the reliability of the construction design and the reasonability of the construction scheme. On getting more key technology parameters of the tunnel construction, using the evaluation method of BQ, Q and RMR analysed and evaluated the classification of the rock level dynamicly, and established the reasonable supporting types and construction parameters.This paper by using the numerical analysis and model test methods, is a preliminary attempt on the mechanical characteristics of the study of tunnel excavation supporting under tectonic stress influence, which provides a certain reference, computer-aided design construction, to reduce the risk of tunnel construction and to speed up the construction of the tunnel.