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为了掌握厚松散层覆盖地区地表在采动过程中的动态移动变形情况,以地表移动观测站实测数据为基础,获得厚松散层开采地表动态移动参数在开采过程中的变化规律,以及走向主断面方向上任意时刻、任意点的下沉速度预计公式。结果表明:当工作面推过最大下沉点170 m左右时,该点的下沉速度达到最大值,其值为22.85 mm/d;地表点最大下沉速度值及其滞后距随工作面开采距离的增大而增加,当工作面推进距离达到600 m左右后,两者增加的幅度逐渐减小,并分别达到稳定值22.00 mm/d和150 m,认为此后的采动过程是地表点下沉速度曲线以固定形状与工作面保持一定的滞后距随开采不断向前移动;参考国内松散层下开采案例,通过多元线性回归分析得到地表动态移动变形参数与地质及开采技术参数之间的关系式;最后根据动态移动参数在采动过程中的变化规律,建立了走向断面上任意时刻、任意点的下沉速度预测公式,通过预测值与实测值的对比,认为预测结果能够满足工程实践需要。
In order to grasp the dynamic deformation of the ground surface during the mining process in the area covered by thick loose ground and on the basis of the measured data from the surface movement observation station, The direction of any moment, any point of the sink speed is expected formula. The results show that when the working face passes about 170 m, the maximum sinking velocity reaches 22.85 mm / d. The maximum sinking velocity and its lagging distance of the ground surface increase with the working face extraction When the working distance reaches about 600 m, the increasing range of them decreases gradually and reaches the steady values of 22.00 mm / d and 150 m respectively. It is considered that the mining process afterwards is under the surface point The sedimentation rate curve keeps a certain hysteresis distance from the working face with a fixed shape and moves continuously with the mining. According to the case of mining under the loose layer in China, the relationship between the dynamic deformation parameters of the ground surface and the parameters of the geological and mining technology is obtained by multivariate linear regression analysis Finally, according to the variation law of dynamic movement parameters in mining process, the formula for forecasting the subsidence velocity at any point and at any point on the strike section is established. By comparing the predicted value with the measured value, the prediction result can meet the need of engineering practice .