基于ANSYS对比分析压力型与拉力型锚杆承载特性

基于Coulomb摩擦模型与DruGker-Prager屈服准则，建立了拉力型锚杆及压力型锚杆的非线性有限元模型，对比分析了不同荷载作用下2种锚杆的承载特性．研究结果表明，在不同的荷载作用下，压力型锚杆的轴力及其杆体剪应力随锚固深度的变化曲线与拉力型锚杆的轴力及其杆体剪应力随锚固深度的变化曲线存在着明显的差异，且2种锚杆的锚固体外侧剪应力的变化曲线同样有明显差异．拉力型锚杆的锚固体外侧剪应力峰值出现在锚固体外端，压力型锚杆的锚固体外侧剪应力峰值出现在锚固体内端；压力型锚杆的荷载．顶端位移曲线近似呈线性关系，而荷载．承载板位移曲线则呈现明显的非线性；压力型锚杆的张拉性能大大优于拉力型锚杆．两者的破坏模式一致，均为土层的剪切破坏．

Comparative Analysis on Bearing Behavior of Pressure-type and Tension-type Anchor Based on Ansys

Based on the Coulomb friction model and the Drucker-Prager yield criterion, the nonlinear finite-element models of pressure-type anchor and tension-type anchor were established to analyze their bearing behavior under different loads. The results of comparative analysis show that there exists obvious difference on the variation curves of axial forces, shear stress, and outside shear stress with the anchoring depth between pressure-type anchor and tension-type anchor. The maximum of outside shear stress of tension-type anchorage is in the outside of anchorage; The maximum of outside shear stress of pressure-type anchorag is in the inside of anchorage. The load of pressur-type anchor increases linearly with the bottom displacemen of anchorage body. Conversely, the load of pressur-type anchor increases nonlinearly with the displacemen of the load-bearing plate. Tension performance of pressure-type anchor is much better than that of tension-type anchor. The results of friction calculation indicate that the failure model of the pressure-type anchor and the failure model of the tension-type anchor are accordance; both are soil mass shear failure.