砂柱式支护体结构设计及力学性能试验研究
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摘要
为解决东大煤矿沿空留巷巷旁支护体结构设计不合理导致支护强度不足的难题,通过砂柱承载力预试验、理论计算、砂柱力学试验等方法,对原有沿空留巷巷旁支护体结构进行优化设计。结果表明:当砂柱填充的砂石材料配比为1∶1并同时对充填材料加水振动使得充填材料密度达到最大且砂柱稳定性最优;砂柱变形量随压力机下压而逐渐增大,当压力表读数为32 MPa时,砂柱的下部区域处于基本破裂状态且加水砂柱比不加水砂柱能承受的极限载荷大。经验证,采用优化后的砂柱支护体能够满足沿空留巷支护强度要求,提高了生产效率。
To solve the problem of insufficient support strength caused by unreasonable structure design of roadway side support of gob-side entry retaining in Dongda Coal Mine, and by means of preliminary test of bearing capacity, theoretical calculation and mechanical experiment of sand pillar, the optimization design of supporting structure of gob-side entry retaining was carried out.The results show that when the ratio of sand and stone material filled with sand column is 1 ∶1 and the filling material is vibrated by adding water, the density of filling material reaches the maximum and the stability of sand column is optimal; when the pressure gauge reading is 32 MPa, the lower part of the sand column is in the basic fracture state and the water-sand column can bear more ultimate load than the water-sand column. It is proved that the optimized sand pillar support body can meet the support strength requirements of gob-side entry retaining and improve the production efficiency.
To solve the problem of insufficient support strength caused by unreasonable structure design of roadway side support of gob-side entry retaining in Dongda Coal Mine, and by means of preliminary test of bearing capacity, theoretical calculation and mechanical experiment of sand pillar, the optimization design of supporting structure of gob-side entry retaining was carried out.The results show that when the ratio of sand and stone material filled with sand column is 1 ∶1 and the filling material is vibrated by adding water, the density of filling material reaches the maximum and the stability of sand column is optimal; when the pressure gauge reading is 32 MPa, the lower part of the sand column is in the basic fracture state and the water-sand column can bear more ultimate load than the water-sand column. It is proved that the optimized sand pillar support body can meet the support strength requirements of gob-side entry retaining and improve the production efficiency.
引文
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[2]张川,文志杰,胡善超.采场顶板控制理论在沿空留巷中的应用[J].煤矿安全,2011,42(4):119-122.
[3]靳晓辉.沿空留巷方案设计与经济性评价[J].内蒙古煤炭经济,2017(10):153-153.
[4]柏建彪,周华强,侯朝炯,等.沿空留巷巷旁支护技术的发展[J].中国矿业大学学报,2004,33(2):183.
[5]汤建泉,宋文军,宋立兵,等.切顶卸压沿空留巷切缝设计与研究[J].煤矿安全,2016,47(9):53-55.
[6]张升,刘洋,刘恒凤,等.固体充填胶结沿空留巷巷帮支护体优化设计[J].煤矿安全,2018,49(3):48-51.
[7]阚甲广.典型顶板条件沿空留巷围岩结构分析及控制技术研究[D].徐州:中国矿业大学,2009.
[8]梁继忠,成云海.矸石充填沿空留巷技术的应用[J].山东煤炭科技,2011(5):33-34.
[9]杨博,柴敬,王民华.直覆厚硬顶板沿空留巷巷旁支护方式研究[J].煤矿安全,2018,49(7):220-223.
[10]杨文华,魏凤山.综采工作面沿空留巷顶板支护探讨[J].煤炭技术,2012,31(8):238-239.
[11]贾民,柏建彪,田涛,等.墩柱式沿空留巷技术研究[J].煤炭科学技术,2014,42(1):18-22.
[12]陈东.钢管混凝土墩柱沿空留巷支护技术[J].煤炭科学技术,2014(S1):1-3.
[13]傅振斌,王作棠,王建华,等.高水材料墩柱式巷旁支护性能研究[J].煤炭技术,2016,35(3):74-76.
[14]史国跃.高瓦斯矿井高水材料充填墩柱沿空留巷技术[J].煤炭科学技术,2014,42(7):30-32.
[15]郭东明,凡龙飞,高杰,等.梧桐庄矿墩柱式沿空留巷巷旁支护技术研究[J].煤炭科学技术,2018,46(1):81-87.