Mechanism Of Shaft Wall Deformation And Engineering Monitoring In Zhuxianzhuang Coal Mine Under The Condition Of "Five Contained" Drainage Water

The main coal seam 8 of Zhuxianzhuang coal mine is covered with Jurassic conglomerate aquifer,namely "five deposits".In order to ensure safe mining,Zhuxianzhuang coal mine adopts the comprehensive management scheme of "five deposits" curtain closure and dredging mining.Due to the close connection between"five contained" and "four contained" hydraulic power at the bottom of alluvium,the water level of "four contained" will inevitably decline due to the drainage of "five contained",which will lead to the consolidation of aquifer and formation subsidence,posing a serious threat to the safe operation of wellbore.To this end,this paper studies the mechanism of shaft wall deformation and engineering monitoring,taking the "five contained" drainage water in Zhuxianzhuang coal mine as the engineering background.Using the methods of theoretical analysis,numerical simulation,laboratory test and field monitoring,the paper systematically studied the stress and deformation characteristics of the shaft wall under the condition of formation hydrophobic settlement,which provided the basis for the safety analysis of the shaft wall.Firstly,the stress calculation theory of the shaft wall under dead weight,side pressure and vertical additional force is analyzed,and then the stress calculation formula of the inner and outer wall under the combined action of the three factors is given by applying the superposition principle.In the aspect of numerical analysis,Using numerical simulation software FLAC,the paper analyzes the Zhuxianzhuang during in different precipitation depth of shaft wall in coal mine under the condition of the soil settlement and the size of additional stress of shaft wall,and the safety of the shaft lining was predicted and analyzed.In the aspect of borehole safety monitoring,in order to analyze and compare the precision of steel string strain sensor and fiber optic strain sensor in borehole monitoring,the laboratory simulation test was carried out.Finally,the wellbore safety monitoring scheme under the "five inclusive" hydrophobic conditions of Zhuxianzhuang Coal Mine was developed,and the test components were installed.After more than half a year of testing,the force deformation data of the borehole wall was obtained,and the safety state of the borehole wall was analyzed in real time.The precautions for preventing wellbore rupture are given,which provides a decision basis for the safe production of mines.Figure[73]table[15]reference[54]...