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为客观预测山区采动地表裂缝的位置和宽度,在分析地表裂缝产生机理的基础上,以主断面上等坡度的坡段为研究对象,并以山区地表下沉、水平移动预计值为主要参数,按照矢量分解与合成法则求取坡段变形预计值,将岩土力学中的临界变形值作为地表起裂判据,进而确定采动裂缝出现的坡段及单位长度内地表裂缝宽度,最后分析了所提方法的适用性。选择山西古交嘉乐泉煤矿1208~1210对拉工作面为例进行实例分析,结果表明:坡段变形预测值和变形分布规律与实际符合较好,出现裂缝的坡段与现场勘查结果基本一致,从而验证了该方法的可行性与有效性。
In order to objectively predict the location and width of ground surface cracks in mining, based on the analysis of the mechanism of surface cracks, taking the slope sections of the same grade as the research object and the main parameters of the surface subsidence and horizontal movement prediction in mountain area , According to the vector decomposition and synthesis rules to obtain the expected value of slope deformation, the critical deformation value of the soil mechanics as the surface rupture criterion, and then determine the mining cracks and slope length per unit length of the surface crack width, the final analysis The applicability of the proposed method. The case study of 1208 ~ 1210 pairs of working faces in Jialequan Coal Mine, Gujiao City, Shanxi Province, as an example, is carried out. The results show that the predictions and deformation distributions of slope deformation are in good agreement with the actual conditions, and the fractured slope sections are basically consistent with the field survey results , Which verifies the feasibility and effectiveness of the method.