典型斷層影響下石膏礦采區(qū)失穩(wěn)機理研究
[Abstract]:As an important non-metallic mineral resource, gypsum plays an important role in economic construction. With the continuous expansion of underground mining area of gypsum mine, the bad geological structure near the stope is activated, which poses a serious threat to the stability of the mining area. In extreme cases, it may lead to the instability of the goaf, resulting in heavy casualties and property losses. As a typical representative of poor geological structure, fault is still insufficient in the study of instability mechanism of gypsum mining area under its influence, so it is of positive significance to study the instability law of gypsum mining area under the influence of fault. Based on the project of Natural Science Foundation of Hubei Province (2011CDB433), "study on Mining damage Mechanism and Control of Hazardous Gypsum Mine in goaf", the method of combining theoretical analysis, numerical simulation, laboratory experiment and case study is adopted. In this paper, a viscosize-Kelvin brittle body model is constructed to study the failure mode of gypsum ore fault and the failure mode of mining area. The mechanism of instability and the subsidence mode of ground surface under the influence of fault are analyzed and studied. The main research results include the following aspects: (1) based on the theory of critical layer and thin plate, the model of surface subsidence basin caused by gypsum mining under the influence of fault is constructed, and the maximum subsidence amount and the vertical shape parameters are obtained. Under the influence of fault, the calculation formula of the displacement of the center point of surface subsidence is obtained. (2) through numerical simulation of the distance from the gypsum mining area to the different working face, the displacement of the gypsum mining area, the expansion of the plastic zone and the law of the surface subsidence are obtained. By analyzing and studying the above laws, the instability mechanism of gypsum mining area under the influence of fault is preliminarily obtained, that is, the roof end which is far from the fault first produces tensile damage, and then passes to the middle of mine house, causing roof caving to fall, and finally transmitting to the surface of the earth. Subsidence appeared on the surface above the mining area. At the same time, the gypsum mining area with different fault dip angle is simulated and the stress field near the mining area is obtained. (3) numerical analysis of unstable collapse accident in underground mining area of Hengdian gypsum mine is carried out by combining theoretical calculation with FLAC3D numerical simulation. Through the calculation of roof stress, the limit span of mine house and the safety factor of pillar, it is found that the failure of fault is the main cause of instability in mining area. The stress and displacement of faults, roof and pillar are compared and analyzed in order to reveal the failure process and failure mode of fault, roof and pillar under the influence of fault. Starting from the formation and evolution of unstable disasters in gypsum mining area, the failure model of fault-mining area is studied in depth, and the model of surface subsidence basin caused by Hengdian gypsum mining under the influence of fault is established preliminarily. The research results can provide a theoretical basis for the control of instability in the mining area of Hengdian gypsum mine and a new idea for the study of the instability mechanism of the underground gypsum mine under the influence of faults.
【學位授予單位】:武漢理工大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TD327
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