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为了获得华亭原安口煤矿工广煤柱地下气化极不充分开采条件下地表沉陷规律,在国内首次建立了条带地下气化工作面覆岩移动与地表沉陷观测站。通过地表测点和浅基点岩移钻孔磁环动态下沉过程分析表明,下沉曲线呈“下沉-上升-下沉-上升-下沉”五阶段阶梯式波动下沉规律,条带气化工作面极不充分开采地表移动和变形具有明显的非线性和非连续性。通过不同磁环动态下沉过程分析,确定了岩层离层区位置。通过地下气化炉燃空区物探分析得出燃空区间投影面呈中间宽、两头较窄的似椭圆形。计算了下沉盆地倾向主断面边界角、最大下沉角和地表最大移动变形参数(imax=1.385 mm/m,εmax=0.516 mm/m,Kmax=0.275 mm/m2),得出了下沉盆地并没有达到危险移动边界,条带地下气化开采没有产生明显下沉盆地,在观测期内没有对地表建筑物造成危害的结论。
In order to obtain the law of surface subsidence under the condition of extremely insufficient gasification of the wide coal pillar in Huating coal mine, a strata movement and surface subsidence observatory for underground gasification working face was established for the first time in China. The dynamic subsidence process of the magnetic core of the borehole through the surface measuring point and the shallow base point rock shows that the sinking curve is in five steps of “sink-up-sink-up-sink” With the gasification of the extremely inadequate mining surface movement and deformation has obvious nonlinearity and discontinuity. Through the analysis of the dynamic subsidence process of different magnetic rings, the position of the delamination zone of the rock formation is determined. Through the analysis of the geogrid gas burial area of the underground gasifier, it is concluded that the projection area of the burnt interval is medium wide and the two ends are narrower elliptical. The boundary angle, the maximum subsidence angle and the maximum ground motion displacement parameters (imax = 1.385 mm / m, εmax = 0.516 mm / m, Kmax = 0.275 mm / m2) Did not reach the dangerous moving boundary, and the underground gasification mining in the strip did not produce obvious subsidence basin, and did not cause any hazard to the surface buildings during the observation period.