【摘要】 <正> 一、概况自家庄矿2~#井22410工作面位于710大巷东北面约100m处,其右侧为已采工作面,左侧是未采区,距地表深为244～250m。所开采的2~#(9尺)煤层呈单斜构造,平均厚度2.43m,倾角13°～15°。煤层自顶板往下0.8m处有一层夹石,厚度为0.05～0.15m,煤层底板无底鼓现象,见图1。更多还原

【Abstract】 based on analysis of rock pressure data obtained in NO. 22410 coal face of Baijiazhuang Colliery, Xishan Mining Administration, the setting load of individual hydrulic propswas 3 times higher than that of friction props; the actual bearing capacity of hydraulic props was high, the time for erection and withdrawal of hydraulic prop was shortened by over 50%; the maximum roof convergence of face using hydraulic props was only about 70% of that of the face using friction props, the annual coal production could double; and the OMS increased to 8.97 tons. It was safe h, reliable and flexible.To make full use of the performance of the hydraulic props, it is suggested the pressure of power pack for supplying emulsion be increased to 150kg/cm~2, So that the setting load may reach 30% of the yield load. Considerations should be given to fabrication of power pack which allow the setting load of hydraulic props to reach 50% of the yield load, the density of props should be adjusted adequately. The time for initiation of safety valve of props be shortened and the safety valve shall have a high opening rate. when mining a seam with soft floor, or when mining an upper slice of a thick coal seam, props with large base shall be selected.更多还原