In this study, the characteristics of the deformation and failure of the mine floor and the influence of the thickness of the mined seam on mine floor deformation are examined in the context of a mine with soft coal, soft mine floor, hard mine roof and varying thickness of the coal seam. The geological and mining conditions at the Working Face 23,301 of the Yungaishan No. 2 Coal Mine are taken into consideration when using the strain induction method to determine the depth of the failure zone which is found to be between 11.6 and 15.5 m based on strain measurements at different depths of the mine floor. The strain increments show that the distance before periodic weighting occurs is between 13.3 and 14.2 m, which is basically in agreement with the observed ground pressure from mining. On this basis, the geological profile of the working face is used in the development of a 3D numerical model. This numerical model is used to determine the depth of the failure zone which is at a depth of about 15 m, which is basically in agreement with the field measurements. It is found that the failure of the floor has obvious zonation. At the same time, the effect of different thicknesses of the mined coal seams on the degree of deformation of the mine floor is discussed with the other conditions unchanged. The results show that the thickness of the mined seam has little effect. That is also consistent with the results of multivariate regression equations and correlation analysis which show that the depth of the failure zone is less impact correlated with the thickness of the mined seam based on 65 sets of measurements of the depth of the failure zone. The research findings are an important practical reference source for preventing water inrush through the mine floor, and determining support strategies for mines.

在这项研究中，在软煤，软矿层，硬矿顶和变化的矿山环境中，研究了矿层变形和破坏的特征以及矿层厚度对矿层变形的影响。煤层的厚度。在采用应变感应法确定断裂带的深度时，应考虑云盖山二号煤矿工作面23301的地质和采矿条件，该应变带根据应变测量结果在11.6至15.5 m之间在矿层的不同深度。应变增量表明，周期性加权发生之前的距离在13.3和14.2 m之间，这与从采矿中观察到的地面压力基本一致。在此基础上，3D数值模型的开发中使用了工作面的地质剖面。该数值模型用于确定大约15 m深度的失效区域深度，这与现场测量结果基本一致。发现地板的破坏具有明显的分区。同时，在其他条件不变的情况下，讨论了不同厚度的开采煤层对矿层变形程度的影响。结果表明，采煤层厚度影响不大。这也与多元回归方程和相关分析的结果相一致，多元分析方程式和相关分析表明，基于65组失效区域深度的测量结果，失效区域的深度与开采层厚度的影响较小。