时间函数与地表动态移动变形规律

详细分析了单参数的Knothe时间函数、双参数的Sroka-Schober时间函数和Kowalski 广义时间函数的优缺点及其相互关系,建立了应用Knothe时间函数进行地表动态移动变形预计的原理、无实测资料矿井时间参数的确定方法和开采单元划分的周期来压步距法.通过对不同工作面推进速度和不同时间影响系数条件下地表动态移动变形规律研究,获得了工作面稳定推进过程中回采速度、时间影响系数与地表最大动、静态变形关系的计算公式.经过1176东工作面观测资料的检验,证明了研究结果的有效性和实用性.

Time Function and Prediction of Progressive Surface Movements and Deformations

Three types of time functions, one-parameter Knothe's model, two-parameter Sroka-Schober's time function and Kowalski's generalized time function, were introduced and their relationships were analyzed. Based on the Knothe time function, the progressive prediction of surface subsidence due to underground mining was established, and the factor of proportionality describing the influence of geological and mining conditions was determined when there was no measured data in practice. A method of periodic pressure distance to divide the total working face into certain elements considering the mining rate or mining duration was proposed. This approach made the calculation of deformation process in time possible from the set-up entry mining to deadline whether the mining rate changed or not. The experiential formula of the ratio of progressive to final maximum deformation values was obtained with respect to different mining rates and different time factors. The result indicates that this method is effective and easy to apply for analysis in practice compared with 1176E measured data.