极软弱围岩主斜井支护技术研究

Supporting technology research of main inclined well in extremely soft rock mining area

内蒙古锡林郭勒盟查干淖尔矿,主斜井为极软弱围岩,岩石单轴抗压强度0.12MPa～5.12MPa,黏土矿物含量60.6%,黏土的矿物成分中蒙脱石含量占82%,围岩吸水软化并具有一定的膨胀性。巷道采用工字钢U型钢支架三次支护都没能控制住围岩变形。本文在测试围岩强度与水理性质,分析围岩载荷的基础上,提出了由基于钢管混凝土支架的高强度支护和围岩卸压等技术构成的全新支护方案,并针对主斜井侧帮变形,试验研究了支架的抗弯能力,改进设计了抗弯型支架。现场支护实践表明,新的支护方案能够有效控制主斜井围岩变形,实现了巷道长期稳定。

Inner Mongolia＇s xilingo] league area of chagannaoer＇ s main inclined shaft is very weak rock, the rock uniaxial compressive strength of 0. 12--5, 12MPa. Clay mineral content is 60.6%, clay mineral composition of montmorillonite content accounted for 82%, surrounding rock water absorption will soften and has some expansibility, ff, oadway using I iron U steel stents to support three times but all are failed to control surrounding rock deformation, on the basis of testing the strength of surrounding rock and water properties in this paper and analyzing the load of surrounding rock, Proposed by based on concrete filled steel tubular high strength bolting support and surrounding rock pressure relief technologies such as new support scheme. Aiming at the main slope lateral deformation, experiments study on the bracket of the flexural capacity and improve the flexural type design support. Field support practice shows that the new support scheme can effectively control the main inclined shaft surrounding rock deformation and to achieve the long-term stability of roadway.