开采沉陷动态下沉模型及其参数研究

针对Knothe时间函数在描述动态下沉过程中下沉速度的不足，采用改进的双参数Knothe时间函数建立动态下沉模型，其中的覆岩岩性决定系数c及幂指数k值采用最小二乘法求解，最大下沉值W0通过地表移动观测站实测资料确定。采用拟合决定系数R2评定精度，以淮南某矿1242（1）工作面地表移动观测站实测资料进行模型精度验证，最大下沉点MS29和ML44在各个观测时期的拟合决定系数分别为0.983 6和0.975 7，工作面推进过半时（328 d）倾向和走向观测线上各监测点观测值与预计值的拟合决定系数分别0.995 3和0.958 2，计算结果表明双参数Knothe时间函数模型动态预计1242（1）工作面开采沉陷全过程精度可靠。

Study on Dynamic Subsidence Model of Mining Subsidence and its Parameters

According to the shortage of Knothe time function of the sinking speed in describing the dynamic subsidence process,the improved two-parameter Knothe time function was adopted to establish the dynamic subsidence model,where the decision coefficient c of overburden rocks and exponent k value were resolved by using the least square method,and the maximum subsidence of W0 was determined through the surface movement observation station by fitting the measured data;R2 coefficient evaluation precision was adopted and applied in a mine in Huainan and in 1242 (1) working surface movement observation station data model to verify the accuracy of the model.The maximum subsidence point,MS29 and ML44 in the fitting decision coefficient of each observation period were 0.983 6 and 0.975 7.The fitting decision coefficients of the observation value and the expected value of each observation point in dip and strike observation line were 0.995 3 and 0.958 2 separately as the advancing is half (328 d).The calculation results show that the dynamic prediction of two-parameter Knothe time function model on the whole process of mining subsidence of 1242 (1) working face is accurate and reliable.