Research on U-steel yieldable support with backfill technology in rock roadway

The loading on U-steel yieldable support cannot be organically combined withthe law of strata behaviors from the surrounding rocks of roadway. In order to effectivelysolve the problem, U-steel yieldable support with backfill material and the performancerequirements of backfill material were analyzed on the basis of structural mechanics. Themechanical properties of backfill material selected were tested in the laboratory, and thetest results show that the ratio of the backfill material complies with the requirements ofbackfill technology; it can effectively optimize the relationship between the support and thesurrounding rock, and the filling layer can avoid the partial stress concentration and fullyimprove the support performance. Compared with U-steel yieldable support with ganguefilling, the filed application shows that the supporting result of U-steel yieldable supportwith backfill technology is satisfactory, the stress on U-steel yieldable support with backfilltechnology decreases greatly and distributes uniformly, convergence of the surroundingrock of roadway is decreased by more than 50%, and the surrounding rocks of roadwayare controlled effectively.

内撑式可缩性U型钢支架在巷道支护中的应用

针对软岩巷道中U型钢支架失稳破坏问题,运用力法原理对有无内撑式可缩性U型钢支架的轴力和弯矩进行理论计算;结合工程现场考察,提出了"内撑式可缩性U型钢支架+锚网索"的联合支护方案。结果表明:巷道两帮最大移近量为40.90 mm左右,顶底最大移近量为62.45 mm左右,支架变形不超过15 mm,工程应用效果较好。

U型钢可缩性支架壁后充填试验研究

基于在复杂性质围岩的巷道中,U型钢可缩支架的承载与围岩的作用无法有机的结合的这一情况,对U型钢支架失稳机理进行了阐述,并研究分析了壁后充填技术的科学性,表明使用U型钢可缩支架壁后充填技术,可有效改善支架与围岩的关系,使U型钢均匀承载,充分发挥U型钢的支护性能。工程应用效果表明,U型钢可缩支架壁后充填技术的实际效果较理想。

千米深井大断面软岩巷道联合控制技术

针对邢东矿千米深井大断面软岩巷道围岩持续变形的控制难题,分析了-980m大巷变形失稳的主要原因,并结合现场地质生产条件,提出多维联合支护技术,即"锚网梁+U型钢支架+喷浆、壁后注浆"的综合治理方案。现场实践表明,采用该方案2个月后巷道变形趋于平稳,顶板最大下沉量88mm,两帮移近量207mm,底臌量92mm,有效解决了-980m大巷持续变形失稳的难题。

直墙半圆拱可缩性U型钢支架卡缆临界约束力理论研究

针对直墙半圆拱可缩性U型钢支架的卡缆约束力不合理问题^([1]),对可缩性U型钢支架提出卡缆临界约束力概念。通过建立直墙半圆拱可缩性U型钢支架的力学模型,给出了支架的卡缆临界约束力的计算公式,并得出在静摩擦系数f=0.20、上下卡缆约束力相等、侧压系数λ=0.4~2.0时,直墙半圆拱可缩性支架系列卡缆临界约束力。