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随着煤炭行业的不断发展,大型综采现代化矿井越来越多,特别是西部地区特厚煤层的开采,对液压支架的结构的稳定性提出了更高的要求。目前,内蒙古、陕西及宁夏等6个煤炭重点建设省区,其煤田煤质好、埋层深及煤层厚,综采设备也朝高端化、重型化与智能化方向发展,液压支架采掘高度也提升到4.5~7.2 m,甚至更高,由于采掘高度的提升,对支架掩护梁的扭转强度带来了巨大考验。由于地质条件的复杂性及开采强度的不断加大,该地区所使用的大采高支架的掩护梁存在焊缝开裂的情况,究其原因是结构件抗扭强度不够。为此,笔者根
With the continuous development of the coal industry, more and more large-scale fully mechanized and fully mechanized mining mines, especially for the mining of the thick coal seam in the western region, put forward higher requirements on the structural stability of the hydraulic support. At present, Inner Mongolia, Shaanxi and Ningxia and other 6 key coal-producing provinces and autonomous regions, the coal has good coal quality, buried depth and seam thickness, fully mechanized mining equipment is also towards high-end, heavy and intelligent direction, the hydraulic support mining height To 4.5 ~ 7.2 m, or even higher. Due to the improvement of the mining height, the torsional strength of the support beam has brought a great test. Due to the complexity of geological conditions and the continuous increase of mining intensity, there are cracks in the welding beam of the shield beam used in this area. The reason is that the torsional strength of the structure is not enough. To this end, I root