深部软岩巷道双壳耦合支护方法技术

一种深部软岩巷道双壳耦合支护方法，采用预应力短锚杆全长锚固加固巷道围岩，使巷道浅部围岩形成具有不小于1m厚度的岩壳，利用预留变形层的足够空间充分转化深部高应力能和膨胀变形能；最大限度发挥塑性区承载能力。在巷道变形过程中，对首先发生不连续变形或破坏的区域安装预应力锚索支护，通过巷道表面位移的监测分析，判定锚索支护的最佳时间。通过锚索支护作用使应力集中区向围岩深部转移，减小围岩应力集中对岩壳的破坏，最后架上三维网壳支架，喷射混凝土，使网壳与岩壳在强度、结构、刚度上完全耦合，实现一次成巷全封闭双壳耦合支护。实现了深部软岩巷道工程稳定性的有效控制，其方法简单、易行，安全经济，支护效果好。

Double shell coupling support method in deep soft rock roadway

A deep soft rock tunnel double shell coupling support method of prestressed short bolt anchoring reinforcement of surrounding rock, the shallow rock roadway rock formation has not less than 1m thickness of the shell, the deformation enough space layer fully converted deep high stress and swelling deformation can maximize the plasticity; area capacity. During the deformation of the tunnel, the prestressed anchor rope support is installed on the area where the discontinuous deformation or damage occurs first, and the optimum time of the anchor support is determined by monitoring and analyzing the surface displacement of the tunnel. The effect of anchor stress concentration zone transfer to the deep surrounding rock, reduce the stress concentration of shell rock damage, finally 3D frame shell support, shotcrete, the shell and shell in rock strength and stiffness of structure, fully coupled, realize a lane closed double shell coupling support support. The effective control of the stability of the deep soft rock roadway is realized. The method is simple, easy, safe and economical, and the supporting effect is good.

【技术实现步骤摘要】

【技术保护点】
１．一种深部软岩巷道双壳耦合支护方法，其特征在于，包括以下步骤：ａ．根据巷道围岩特性，通过力学分析、物理相似模拟试验及有限元数值模拟确定预留变形层（６）的厚度（Ｈ）：式中：Ｈ为预留变形层（６）的厚度，为围岩体的内聚力，为内摩擦角，为围岩松弛时间，为围岩滞后变形时间，为围岩瞬时变形模量，为长期剪切变形模量，为围岩泊松比，为巷道半径，为一次支护强度，为原岩应力；ｂ．根据井下运输、通风、设备安装的要求确定巷道设计的毛断面尺寸，根据巷道设计的毛断面尺寸设计三维网壳支架（７）；ｃ．根据预留变形层（６）的厚度（Ｈ）及巷道设计的毛断面尺寸确定巷道掘进预备空间断面尺寸；ｄ．开挖巷道掘进预备空间，巷道掘进预备空...

【技术特征摘要】

【专利技术属性】
技术研发人员：李冲，徐金海，卢爱红，周保精，张连英，万世文，吴锐，李明，李凯，
申请(专利权)人：中国矿业大学，
类型：发明
国别省市：32