深井软岩巷道钢管混凝土支架支护技术研究

Research on Support Technology of Concrete-filled Steel Tube Support in Deep Soft Roadway

通过对某矿141211运输巷进行现场调查和变形监测,采用室内试验、理论研究、数值模拟、理论计算等研究方法,分析巷道变形破坏特征,揭示了巷道变形破坏机制,确定工程地质条件差、围岩强度低,自稳能力差、支护设计不合理,施工不严、高地应力且受水理作用是巷道变形破坏的主要原因。基于高阻让压耦合支护、关键部位加强支护、围岩强化阻水支护的围岩控制原理,提出了顶帮锚杆网索、帮角高强锚杆、灌浆400mm+钢管混凝土支架的联合支护方案并进行工业试验。试验结果表明:巷道修复后,90d顶板最大变形量108mm,两帮移近量72mm,50d后围岩变形区域稳定,总变形量在可控范围内,支护效果良好。

Through on-site investigation and deformation monitoring of the 141211 transportation roadway in Guizhou mining area,by using indoor research,theoretical research,numerical simulation,theoretical calculation and other research methods,the deformation and failure characteristics of the roadway were analyzed,the deformation and failure mechanism of the roadway was revealed,and the main reasons for roadway deformation and damage was determined as follows:poor engineering geological conditions,low strength of surrounding rock,poor self-stability,unreasonable support design,poor construction,high ground stress and influence of water treatment.Based on the surrounding rock control principle of coupling support with high resistance and yield pressure,strengthening support at key position and strengthening water-resistance support by surrounding rock,the combined support scheme of roof bolt and mesh cable,high-strength bolt in roadway angle and grouting400 mm with concrete-filled steel tube support was put forward and industrial test was carried out as well.The results showed that the maximum deformation of roof was 108 mm and the displacement of two sides was 72 mm in 90 days after roadway repairing.After 50 days,the deformation area of surrounding rock was stable,and the total deformation was under control,with a good supporting effect.