论文部分内容阅读
针对软岩巷道锚注结构承载特性的时变特征,尝试将锚注结构的承载力视为时变值,并将巷道周边弹性区、塑性区以及锚注区简化为厚壁圆筒的受力分析问题,通过引入弹黏塑性本构模型,得到了锚注结构承载力的计算公式,理论分析表明:流变停止所需的锚注结构承载力以及流变量随Pb(原岩应力)与s(拉伸屈服极限)比值的增大而升高,流变特性更为显著、支护难度增加;锚注支护强度及范围的减小,导致流变停止所需的承载力以及流变量升高,是造成锚注结构失效、流变加剧的主要原因,而流变停止所需的承载力又与锚注参数密切相关,合理确定锚注参数保证流变停止时锚注结构的稳定至关重要。理论计算结果较好的反映了锚注结构承载力随流变变形增加而逐渐增大的时变规律,且与现场实测结果较为吻合,对软岩巷道锚注支护设计可起到一定的指导作用。
Aiming at the time-varying characteristics of the load-bearing characteristics of the bolting-grouting in soft rock roadway, the bearing capacity of the bolting-grouting structure is considered as a time-varying value, and the surrounding elastic zone, plastic zone and anchor grouting zone are reduced to the thick cylinder Through the introduction of elasto-viscoplastic constitutive model, the formula for calculating the bearing capacity of the anchored-injection structure is obtained. The theoretical analysis shows that the bearing capacity and the flow capacity of the anchored-injection structure required for the stopping of the flow vary with Pb (original rock stress) (Tensile yield limit) increased with the increase of rheological properties of more significant, supporting the difficulty increases; the strength and scope of the anchor bolting support decreases, resulting in the flow of rheological capacity required to stop and rise High, which is the main reason of the failure of the structure of the anchor injection and the increase of the rheology. The bearing capacity needed for the rheological shutdown is closely related to the parameters of the anchor injection. The parameters of anchor injection should be reasonably determined to ensure the stability of the anchor injection structure when the flow is stopped important. The theoretical calculation results better reflect the time-varying regularity that the bearing capacity of anchor-injection structure increases gradually with the increase of rheological deformation, which is in good agreement with the field test results, which can guide the design of bolting-grouting support in soft rock roadway. effect.