Study On The Law Of Strata And Ground Movement Due To The Extraction Of Industry Square Pillar Of Jiahe Mine

Industry Square protect pillar mining is an issue that many resources exhausted Coalmine will be face, in order to ensure the safety of the wellbore and surface building in mining process is necessary for the Industrial Square mining technology research. In this paper, the theoretical basis of previous studies on in Jiahe protective pillar mining industry as the research object, by mining the measured data processing、 Prediction method of wellbore and surface movement deformation analysis、Research on industry square pillar mining method and numerical simulation comprehensive research, Provides the reasonable mining scheme for Jiahe mine industry square pillar, At the same time, can also provide reference for other mining industry square pillar mining under similar geological conditions. The main work and reads as follows:(1) Through the detailed analysis of the Jiahe 7208 working surface observation data of observation station, get the area surface movement and deformation rule and probability integral parameter, based wide area coal workers pillar mining study provides a scientific basis, To provide a scientific basis for coal mining industry square pillar of the region.(2) According to the theoretical research and the exploitation of existing instances of domestic and abroad industrial square coal pillar mining, geological and mining conditions for Jiahe Minerals Industry Square Pillar designed over wellbore coal pillar mining scenarios: First, the cross seam at replace the wall shrinkable borehole, followed crib set is closed on the outside of the wall can be reduced, and then around the wellbore leaving in certain coal pillar width of the box, not the other column lump coal mining, other than just lump column protection strip mining coal column.(3) In this paper, Jiahe Minerals Industry Square Pillar as the prototype, combined with FLAC3 D numerical simulation program for different mining methods, different mining and industrial plaza remain wide pillar mining program different recovery rate in case of the mechanical deformation and movement areas analysis, we can draw the following conclusions: ① Protection of coal column outside of the box pillar of the whole mining, wellbore and surface movement and deformation is large, is not conducive to the protection of the borehole and the ground building; At the same time under the influence of the vertical stress concentration at the bottom of the wellbore may produce the destruction of the wellbore. The strip mining have less effect on the shaft and the surface structures, is conducive to the protection of the wellbore. ② The recovery rate under the same conditions, mining width left great influence on the change of well bore; mining width bigger surface subsidence is bigger, the movement and deformation of shaft is intense, the recovery rate under the condition of constant mining width smaller protection of wellbore and surface buildings more favorable. ③ When mining width of 40 meters, with the movement and deformation recovery rate of increase in surface and borehole increases, but it increases the amount is small. In the case of certain mining width, to ensure the stability of the strip coal pillar situation can be as large as possible to improve the recovery rate.(4) with the simulation results of shaft coal pillar mining method and numerical method, using two kinds of mining and mining design of Jiahe mine coal pillar mining scheme, two kinds of schemes of mining surface movement and deformation of wellbore and predicted by using probability integral method, through the comprehensive analysis of that folder River miners wide coal pillar mining width for strip mining scheme using 40 m, leave 60 m wide strip is appropriate.(5) By analyzing the causes of the destruction of the wellbore after mining, targeted for repair and reinforcement of the wellbore in advance, and enhance resistance to deformation of the wellbore, while in the process of working in a wide pillar mining and underground borehole should regularly upgrade facilities for inspection, to prevent a major accident. In the work surface to set up observation stations, and observation of the surface building and production equipment, when the wellbore and surface buildings appear much damage to immediately stop production, and find out the cause of the problems to be solved.