Influence Of In-situ Stress On Movements Of Rock Mass Caused By Excavation

Firstly, methods for situ stress measurements are summarized in this article, by testing inXiaoguanzhuang Iron mine and Taipingliang tunnel. According to a large number of measureddata, the applicability of overcoring stress relief method and Bolt stress meter method usingrespectively in of the deep and shallow excavation is discussed. The measured data showedthat the stress field in the deep rock mainly consists of horizontal tectonic stress and of gravityin the shallow rock.Numerical simulation and analytical calculation for stress test area is done by usingANSYS and Matlab software respectively, and the results are very consistent with themeasured data. Compared with the measured deformation and stress test data, we canconclude that influence of tectonic stress on movement and deformation in the deep mining isvery obvious, and the affected areas are large. And the fact that movement and deformation inthe shallow excavation is mainly caused by the gravity stress has been proved, and summedup the laws of stress.And the reinforcing measures is developed for the problem of mountaintunnel support..On the basis of the measured data and simulation results, the deformation mechanism ofdeep and shallow excavation is analyzed from three aspects: the characteristics of Rock mass,geological structure and excavation methods. According to the analysis of these mechanisms,Influences of depths and other factors on the of rock mass is summarized, after control ofthe excavation of rock movement and deformation of the reference value, which may provideadvices for the problem of movement and deformation due to underground excavation.