Comprehensive Survey Of The Stone Mine Goaf Beneath The Chengdu-Chongqing Passenger Railway And The Study Of The Treatment Measures Base On The Stability Analysis

With the rapid development of large mining railway construction and underground mineral resources, a lot of railway projects inevitably through underground goaf, goaf area easy to deformation, cracking, collapse, great harm to engineering. In this paper, Chengdu to Chongqing passenger dedicated line Rongchang to Yongchuan section distribution of stone mining area as the research background, focuses on the exploration of mined out region, evaluation, analysis.First of all in the mined out area landform, formation lithology and structure, especially to analyze the distribution characteristics of limestone, hydrogeology conditions, through a large number of field survey and measurements to understand the goaf mining method, range. Along the mountain slope, were found in pigskin disc, Taiping field, double bridge field, majestic dam, Yao Jia Wan, a total of6concentration of stone mining goaf.Based on the collected data and geological mapping, the ultra high density resistivity method, symmetric quadrupole DC electric sounding method, seismic reflection wave method to determine the comprehensive geophysical prospecting, mining suspected areas; and then through the drilling, when the depth is larger, the deep hole drilling, the presumed mined out areas and geophysical interpretation mined out suspected area drilling test; based on the drilling of goaf, on a larger scale, severely damaged areas, the cross hole seismic wave transmission tomography in drilling between (seismic CT), find out the space form of mined out area between the boreholes; most were taken for testing physical and mechanical properties of the gob roof, floor representative samples, take the goaf distribution representative water samples, analysis of water quality test. Through a comprehensive investigation, understand the stone goaf distribution range, mining, mining exploitation position, width and height of the empty, roof rock mass properties, characteristics of ground deformation of goaf, etc.. And analyze the influence of stone mine goaf on line, the space relationship between the line and the goaf.By means of the gob roof thickness, gob roof rock properties, blasting vibration, the underground water level and the influence to the change of surface subsidence and cracking of the factor analysis, investigation of the surface subsidence and ground crack, calculation of roof stability, and found that the critical depth, the roof and foundation stability evaluation of mined out area.Finally, the study on the treatment measures of the mined out area, focusing on the determination processing range, according to the different project types, adopt corresponding treatment measures and suggestions...