网壳锚喷支护理论分析及其在兖州矿区的应用

跨采及软岩巷道地压强度高、变形强烈,支护较为困难。传统支护方式成本高、工艺复杂。根据地面大跨度板壳原理设计出网壳结构,该结构稳定性强,能承受较大变形地压及冲击荷载。钢筋网壳结构是巷道支护工程中一种新型的支护形式,既可在巷道内单独组装对围岩进行连续支撑,又可先撑后喷,在围岩表面形成半刚性钢筋混凝土薄壳衬砌结构。能承受强大变形地压及采动荷载,达到用较少材料又提高喷层支撑能力与让压的目标。介绍了钢筋网壳锚喷支护的技术特色与支护原理,并对其进行理论分析,推导出钢筋网壳锚喷结构的计算模型及其内力与主要应力的计算表达式。完成了室内整架载荷试验,成功应用于兖州矿区跨采巷道。

Analysis of shell bolting and shotcrete supporting and their application in the Yanzhou mine

It is difficult to provide support to overpass and soft-rock mining drifts because of high ground pressure and excessive deformation.Traditional means of support have the disadvantage of high cost and complex technology.Based on the mechanical principle,shell structures are designed such that improved stability and capacity under deformation earth pressure and impulse load can be achieved.Reinforced shell structure is a new type of support for tunnel engineering in soft rocks in forming a continuous lining to the surrounding rock by itself,or to serve as a half-rigid support before concrete spraying.Features of the technology and supporting theory are introduced and analyzed.The calculation model and expressions for calculating the internal forces and main stresses are derived.Laboratory test is conducted and its application to the Yanzhou mine is successful.