【摘要】 通过研究深部软岩巷道开挖面围岩力学承载结构的形成机理和演化规律,指导巷道结构性失稳支护工艺设计。基于软岩力学模型和统一强度准则,考虑"开挖面效应、时间效应",推导围岩弹塑性解。在算例分析中,建立围岩力学承载结构,提出围岩结构性失稳的梯次支护的原理,发现围岩力学承载结构对巷道破坏特征有一定影响,并分析"面效应、时间效应"影响下的围岩力学承载结构稳定性。据此设计"短锚杆全长注浆端头锚注短锚索"梯次支护方法;经数值计算,可知改进后的梯次支护能够确定合理的锚注有效范围,该支护能使围岩形成稳定的承载结构,并及时减小围岩松动圈范围。更多还原

【Abstract】 This paper focused on analyzing formation mechanism and evolution rule of surrounding rock mechanical bearing structure around deep soft roadway excavation face,guiding the design of support technology for roadway structural instability. Based on soften rock mechanics model and unified yield criterion,surrounding rock elastic-plastic solution Deduced was deduced with considering "Time effect-Face effect ". Through calculating-examples analysis, surrounding rock mechanical bearing structure was established, principle of multi-echelon supporting was put forward according to the surrounding rock structural instability. It was found that roadway failure characteristic was influenced by surrounding rock mechanical bearing structure. Mechanical bearing structure stability was analyzed under "Time-Face effect ". According to the above conclusion,design "full length anchoring and grouting of short anchor-End anchoring and grouting of anchor-short anchor cable"multi-echelon support. Numerical calculation found that the modified multi-echelon support could determine effective range of anchoring and grouting,and maintain steady surrounding rock bearing structure,decreased timely loosing circle of surrounding rock.更多还原