采空區(qū)空隙分布規(guī)律及注漿加固治理
[Abstract]:The residual voids and voids in goaf are one of the causes of secondary subsidence, spontaneous combustion of coal seam, accumulation of harmful gas and water inrush of mine. Taking the equilibrium structure of mining broken rock and secondary rock mass as the main research object, using the means of theoretical analysis, this paper puts forward the viewpoint that the overburden structure of the old goaf will remain stable when the coal pillar is stable and the key block is stable in the goaf. The height of collapse zone and fracture zone under different conditions can be deduced based on the characteristics of rock formation breaking and expansion, and the predicted height of water-conducting fissure zone under any lithologic combination can be obtained, and the height of water-conducting fissure zone can be finally determined by combined motion of rock and beam. When the axial load is small, the axial strain increase is mainly caused by the location adjustment of the broken rock, and when the axial load is larger, The reason for the increase of axial deformation is that the broken rock is further broken into small diameter rock and slid into the void under the condition of stress concentration. Water accelerates the compression deformation of broken rock. On the one hand, water acts as a lubricant between broken rocks, which is conducive to the adjustment of particle position in broken rock. On the other hand, water acts as a porter for further fragmentation of small particles of rock, accelerating the slippage of small particles and filling the void between large gravels. Similar simulation studies determine the distribution of the voids, while the void ratio of the collapse zone is determined by the compression experiment of broken rock, and the void rate of the fracture zone can be neglected because of the few grouting voids due to the closure effect. The caving zone can be divided into irregular collapse zone and regular collapse zone, so it is reasonable to calculate the void volume of regular collapse zone and irregular collapse zone only by grouting volume. The void height of the regular collapse zone is based on the results of similar simulation. The height of the irregular collapse zone is 0.915 ~ 0.975 times of the extracted thickness, and the porosity is determined by the porosity determined by the compression experiment of broken rock. The voids volume of goaf is predicted. Combined with goaf grouting site, the grouting effect of goaf is tested by drilling detection, grouting testing, in-hole television testing and bearing capacity experiment of stone body. The results show that: after grouting treatment, The data processing center 1# building site is suitable for construction.
【學(xué)位授予單位】:山東科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TD325.3
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