Study On The Deformation Properties And Key Factors Of Layered Rock Mass

Various of engineering construction project increased a large number, with the development of economy. Because of having known little about engineering and improper treatment of engineering failure phenomena becomes increasingly pronounced. Rock slope especially difficult to prediction and control because it has complicated geological conditions. It has become an important problem that we often meet to evaluate stability and deformation of rock slope.In this paper, we study on the rock slope of the hydropower station of Jin Ping, and also evaluated its deformation and stability by some kinds of method. We hope this study could obtained accurate prediction results and could provide the theoretical guidance for the construction and running.In our study, the main content is studied on field monitoring and analysis monitoring data and numerical simulation and geomechanical model experiment. The analysis of monitoring data including two methods: directly analysis monitoring data and analysis monitoring data after fitting data. This study could obtain a result that the slope's integrated statue is stable after excavation and protection. Though the curve has some fluctuations it don't have effect on the slope, because the curves could return to normal after constructions ending .the slope will be in stable in the later time by fitting analysis. But field monitoring will go on in order to accurately grasp the status of the slope and ensure the slope is safety and economical during construct and operation. In this thesis we prove some other methods besides foreword. First, establish special constitutive relation for the rock slope of the hydropower station of JinPing. Then analysis the calculate result and draw any conclusion: ground stress is high in slope interior and the surface of slope will be influenced greatly, we should reinforce support in this area. Second, making systematic analysis of monitoring data, including direct analysis and fitting analysis. The result of fitting analysis is that the slope's integrated state will be stable too. Third, we work on the experimental studies of the geomechanical model and compare its result with the result of study on the monitoring, then we obtained a result that the slope also has some factors of unstable in some areas. Though the slope is stabje now, we should strengthen monitoring. Finally, through the analysis of geology condition of the slope we study on the factors which affect the stability and deformation. The factors including: the effect of crustal stress, the effect of excavation unloading, the effect of anchor cable (or bolt) and the effect of groundwater. The crustal stress is the most effect condition of the four factors. Excavation unloading and water have bad effect and anchor cable (or bolt) could control deformation and keep stable.According to the characteristics, weathering degree of the rock and the characteristics of the discontinuous structure surface we classificate to the failure models of the slope. There are 3 kinds for instance dumping and fracturing, sliding and fracturing, sliding and compression. Deep analysis on the failure mechanism and forming condition is a theoretical foundation to evaluate the stability and deformation of the slope.From the above research we made the conclusion that: the slope is basically stable and the deformation is little, Deformation will be controlled other some supporting projects. Some suggestion about protecting measure of slope has been proposed according to the engineering geologic characteristics and the result of stability evaluation.