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为研究软岩圆巷开挖面附近围岩在“锚网喷”支护后围岩力学承载结构的稳定性,依据围岩变形及受力特征,沿巷道径向依次将围岩划分为破裂区、软化区和弹性区,其中,“锚网喷”支护主要作用于破裂区中.基于统一屈服准则、增量型本构关系和软岩力学模型,得到了“围岩-支护”相互作用下的围岩应力和变形解.考虑切向应力和等效剪应力的集中以及围岩强度,将围岩力学承载结构由浅入深依次划分为“弱-主-强”结构.通过算例分析,可知围岩力学承载结构的承载范围和承载位移及其剪切应力,受锚杆支护间排距、软化模量和开挖空间效应等因素的影响.在工程实践中,基于“围岩-支护”力学承载结构理论,设计的“锚网喷注”支护方案能够提高围岩强度、降低软岩巷道变形量,保证了掘巷初期的稳定性.
In order to study the stability of the surrounding rock near the excavation face of soft rock round roadway in the mechanical bearing structure of surrounding rock after “anchored net spray ” support, according to the deformation and stress characteristics of the surrounding rock, Which is the rupture zone, the softening zone and the elastic zone, of which “anchor-net-spray” support mainly acts in the rupture zone.Based on the unified yield criterion, incremental constitutive relation and soft rock mechanics model, The stress and deformation of the surrounding rock under the interaction of “rock-support” is considered. Considering the concentration of the tangential stress and the equivalent shear stress and the strength of the surrounding rock, the mechanical bearing structure of the surrounding rock is divided into “weak-main Strong ”structure.An example analysis shows that the bearing capacity, bearing displacement and shear stress of surrounding rock mechanics load-bearing structure are affected by such factors as the spacing between anchor support, softening modulus and excavation space effect In engineering practice, based on the theory of “bearing rock - support” mechanics bearing structure, the design of bolting support can increase the surrounding rock strength and reduce the deformation of soft rock roadway, Lane early stability.