某矿膨胀岩巷道支护参数优化数值模拟与工业试验

为解决云南某矿山无轨运输巷道因膨胀性花岗岩引起的工程灾害,通过微观试验、超声波波速测试、锚杆拉拔力测试等方法,对膨胀岩巷道的膨胀等级、围岩松动圈及矿山原有支护效果进行判定,并运用3D-σ有限元模拟软件对9种锚杆参数模拟分析。结果表明:该矿山花岗岩属于强膨胀性软岩,松动圈范围在1.6~1.8 m,原有支护不能满足工程实际;采用喷锚网联合支护时,锚杆长度2.1 m,间、排距分别为0.9 m和1.2 m时的支护效果最好;现场工业试验发现巷道变形在施工2个月左右趋于稳定。

兴安煤矿深部高应力强膨胀型软岩巷道支护对策研究

随着矿井开采深度的增加,地质环境趋于复杂,使得深部软岩巷道支护十分困难,高应力强膨胀型软岩巷道的支护难度尤为突出。结合鹤岗矿务局兴安矿四水平新副井井筒与马头门工程实例,分析了深部中生代高应力强膨胀型软岩巷道的破坏特征,提出了锚网索喷+底角锚杆+柔层桁架耦合支护技术,分析了其在深部中生代高应力强膨胀型软岩巷道支护中的可适用性,并在工程中得到了验证。

A study of support strategies in deep soft rock:The horsehead crossing roadway in Daqiang Coal Mine

Geomechanics in deep mines becomes more complex and structural support in soft rock can be very difficult.Highly stressed soft rock subject to expansion deformation is particularly difficult to control.The Tiefa Coal Industry Group Daqiang Coal Mine is used as an example.A ventilation shaft,à550 horsehead,is located in tertiary soft rock.Analysis of the reasons for deformation shows an intumescent rock,which is easily damaged.Field observations and theoretical analysis led to a design capable of stabilizing the rock.A combination of spray,anchors,anchor bolts,and soft corner coupled truss supports allowed the deformation to be controlled.This provides a model for similar designs when support of a horsehead roadway is required.