摘要
为研究影响厚松散层浅埋煤层开采地表下沉的主要因素,应用正交实验法,借助数值模拟研究结果,对基岩厚度、松散层厚度及开采厚度3个因素进行影响程度排序。结果表明:基岩厚度是地表下沉的主要控制因素,在此基础上分析得出基载比和基采比是判定地表下沉及覆岩破坏程度的关键因素。通过回归分析拟合给出地表最大下沉值及地表下沉系数与影响因素的综合函数表达式,应用工程实例予以验证,结果表明函数表达式具有较高可信度。
To study the main factors affecting the surface subsidence in shallow seam mining with thick unconsolidated strata, the orthogonal experiment method was used to rank the influencing degree of the three factors: bedrock thickness, unconsolidated strata thickness and mining thickness. The results show that bedrock thickness is the main controlling factor of the surface subsidence. It is concluded that ratio of bedrock thickness and mining height and ratio of bedrock thickness and overburden thickness are the key factors to determine the degree of surface subsidence and overburden failure. The comprehensive function expressions of the maximum subsidence value, coefficient of subsidence and influencing factors are given by regression analysis and fitting. The results are verified by engineering examples. The results show that the function expressions have high reliability.
引文
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