特厚富水软岩巷道钢管混凝土支架支护技术研究

发布时间：2018-04-02 14:06

本文选题：极软岩巷道　切入点：钢管混凝土支架　出处：《煤炭科学技术》2016年01期

【摘要】：为解决查干淖尔一号井井底车场极软岩巷道支护问题,结合井底车场巷道围岩物理力学性质和原有支护条件下巷道破坏情况,运用修正的芬纳公式估算出围岩压力为0.9 MPa,计算理想状态下原有支护体可提供的支护反力为0.718 MPa,以支护体可提供的支护反力大于巷道稳定所需支护反力作为巷道稳定的必要条件,认为原有巷道发生变形破坏的主要原因是支护体支护反力不足,提出了钢管混凝土支架+厚混凝土喷层复合支护方案进行巷道返修,该方案理论上可提供1.48 MPa支护反力。结果表明:巷道返修完成2年后,两帮最大移近量为89 mm,顶底板最大移近量为142 mm。混凝土喷层没有开裂现象,巷道未发生明显变形,基于钢管混凝土支架支护技术的复合支护能有效控制巷道围岩变形。
[Abstract]:In order to solve the problem of supporting roadway in the bottom pit of Chaganaoer No. 1 well, combined with the physical and mechanical properties of surrounding rock of roadway in bottom pit and the failure of roadway under the original supporting condition,By using the modified Finner formula, the surrounding rock pressure is estimated to be 0.9 MPA, and the support reaction force provided by the original support is calculated to be 0.718 MPA in ideal condition. The supporting reaction force provided by the supporting body is greater than the supporting reaction force required for roadway stability.Necessary conditions for stability,It is considered that the main reason for the deformation and failure of the original roadway is the insufficient supporting force of the supporting body. This paper puts forward the composite support scheme of concrete-filled steel tube (CFST) support and thick concrete shotcrete layer for roadway rework, which can theoretically provide 1.48 MPa supporting reaction force.The results show that two years after the completion of roadway repair, the maximum movement of the two groups is 89 mm and the maximum of roof and floor is 142 mm.There is no cracking phenomenon in concrete shotcrete layer and no obvious deformation occurs in roadway. The composite support based on steel tube concrete support can effectively control the deformation of surrounding rock of roadway.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家自然科学基金资助项目(51474218,51134025)
【分类号】：TD353

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