Stability analysis of key stratum structures of large mining height longwall face in shallow coal seam
ZHOU Jinlong1，2，HUANG Qingxiang2
(1. School of Energy and Mining Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
2．School of Energy Engineering，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China)
Abstract：The fully mechanized mining method with a large mining height is widely applied in shallow thick coal seam of western regions in China，and the key stratum structure and its stability in fully mechanized longwall face with a large mining height have significant impact on the mine pressure and surrounding rock control. A calculation model of the goaf filling degree of the equivalent immediate roof including fully filling and generally filling types was established. Based on physical simulation experiments and UDEC numerical simulation，the stabilities of“high position and oblique step voussior beam”structure of single key stratum and“oblique step voussior beam and voussior beam”structure of double key strata in large mining height longwall face were analyzed，and the pressure mechanisms of the longwall face with single key stratum or double key strata were revealed. A formula for calculating the reasonable support resistance in the longwall face，taking the static load of the equivalent immediate roof and the instability dynamic load of the key stratum structure as the basic load and the additional load respectively，was put forward. An engineering example analysis indicates that the support resistance increases linearly with increasing the mining height，the break angle of the stratum，the thickness of the key stratum and the length of the key block，but decreases linearly with increasing the rotation angle of the key block，and that，when the mining height is the same，the support resistance increases with increasing the thickness of the equivalent immediate roof，and the static load of the equivalent immediate roof contributes mainly to the pressure of the hydraulic support in a large mining height longwall face. The reliability of the calculation formula of the support resistance was verified，and it is shown that the calculation formula can provide a reference for the support selection and ground control in similar longwall faces.
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2019, Vol. 38 
