基于覆岩剩余自由空间高度的地表最大下沉值确定方法

Determination method of maximum subsidence value for surface based on remaining free space height of overburden

针对待采综放工作面的地表最大下沉值难以精准确定的问题,依据采空区覆岩移动、变形、破坏特点和矿压显现规律,提出覆岩剩余自由空间高度等于地表最大下沉值的观点,通过分析覆岩剩余自由空间高度与采高、垮落带高度和垮落岩体残余碎胀高度之间的空间转变关系,构建了待采工作面地表最大下沉值的计算模型。以大平矿S2S2工作面为例,利用计算模型得到的地表最大下沉值为11.17 m,通过现场实测得到的最大下沉值为11.07 m,计算结果与实测结果的相对误差为0.10 m,误差率仅为0.90%。

In view of the problem that it is difficult to accurately determine the maximum subsidence value of the surface of the fully mechanized caving face,according to the characteristics of movement,deformation and damage of overburden in goaf and the law of mine pressure appearance,it is proposed that the height of the remaining free space of the overburden is equal to the maximum subsidence of the surface.Through the analysis of the spatial transformation relationship between the residual free space height of overburden and the mining height,the height of caving zone and the residual swelling height of caving rock mass,the calculation model of the maximum subsidence value of the working face to be mined is established.Taking the S2 S2 working face of Daping Mine as an example,the maximum subsidence value of the surface obtained by the calculation model is 11.17 m,and the maximum subsidence value obtained by the actual measurement is 11.07 m.The relative error between the calculation result and the actual measurement result is 0.10 m,and the error rate is only 0.90%.