隧道围岩中注浆锚杆的应力分布及影响因素研究

为深入研究注浆锚固应力分布变化规律,以圆形隧道开挖为例,将注浆锚杆与周围浆体视作锚固体,分析锚固体受力特征,推导锚固体轴应力和剪应力表达式.通过理论分析和数值模拟对比证明理论解析的合理性,并分析不同影响因素下锚固体应力分布的变化规律,通过数值模拟与理论对比分析验证解析方法的可行性.锚固体两端轴应力均接近0,且在中性点处...

Study on Stress Distribution and Influencing Factors of Grouting Anchor in Tunnel Surrounding Rock

In order to deeply study the variation of stress distribution of grouting anchor, taking the excavation of circular tunnel as an example, the grouting anchor and surrounding slurry are regarded as anchor solids, the stress characteristics of anchor solids are analyzed, and the expressions of axial stress and shear stress of anchor solids are derived. The rationality of theoretical analysis is proved by theoretical analysis and numerical simulation, and the variation of stress distribution of anchor solids under different influencing factors is analyzed. The feasibility of the analytical method is verified by numerical simulation and theoretical analysis. The axial stress at both ends of the anchor is close to 0, and the axial stress at the neutral point is the largest; The smaller the bolt diameter is, the closer the neutral point is to the center of the tunnel; The length L of anchor has the greatest influence on the stress distribution, and the diameter d_s of anchor, the cohesion c of surrounding rock and the distance X₁ from the working face during the initial support construction have the second influence on the stress distribution.