1. Coal Mining and Design Branch,China Coal Research Institute,Beijing　 100013,China; 2. Coal Mining and Design Department,Tiandi Science and Technology Co. ,Ltd. ,Beijing　 100013,China

将工作面上覆岩层分为关键层下部软弱岩层、关键层、松散层3部分,根据关键层理论建立了地表偏态下沉模型。通过引入地表下沉偏态程度分析了各种因素对地表偏态下沉的影响并利用数值模拟分析了松散层厚度对地表偏态下沉的作用。研究结果表明:(1)关键层下部岩层碎胀系数越小,偏态程度越明显;关键层距煤层顶板高度越小,偏态程度越明显;煤层厚度越大,偏态程度越明显;当采空区长度达到一定值后,偏态程度不随采空区长度的增加发生改变;关键块平均长度越大,偏态程度越明显;松散层厚度越大,偏态程度越明显。(2)松散层厚度的增加只可以使地表下沉具有连续性,但不会抵消地表下沉的偏态程度。

The overlying strata of working face was divided into three parts including soft stratum,key strata and alluvi- um. At the same time,the skewness subsidence model was built based on key strata theory to analyze the influence of all kinds of factors on skewness subsidence by introducing the concept of skewness subsidence level. In addition,the numerical model was used to analyze the effect of loosed bed thickness on earth surface skewness subsidence. The re- sults showed that the smaller bulking coefficient was,the more obvious the skewness level was;the smaller the distance from key strata to coal roof was,the more obvious the skewness level was;the larger the coal thickness was,the more obvious the skewness level was. When the length of goal reached a constant value,the skewness level remained un- changing;the larger the length of key strata was,the more obvious the skewness level was;the thicker the coal seam was,the more obvious the skewness level was. Also,the thickness increase of loosed bed can only make the subsidence continuity,but it cannot offset the skewness subsidence level.

YU Qiuge,ZHANG Huaxing,DENG Weinan,et al. Analysis of influencing factors of surface skewed subsidence based on key strata theory [J]. Journal of China Coal Society,2018,43(5):1322-1327.