加锚岩体细观破坏数值模拟

Numerical Simulation on Meso-scale Failure Process of Bolted Rocks

将端部锚杆模型应用到改进刚体弹簧方法中,建立了加锚岩体细观破坏数值模型。考虑拉裂和剪切2种破坏模式,拉裂破坏通过拉裂强度进行判断,剪切破坏通过Hoek-Brown准则进行判断。算例表明,锚杆的施加在细观尺度上遏制了张拉裂隙的产生并使剪切裂隙相应增多,显著提高岩体的单轴抗压强度,并抑制岩体的侧向变形。

A model for rock anchor bolts is implemented in the modified rigid body spring method, and then a meso-scale numerical mode! for the simulation of failure process of bolted rock is established, in which, both tensile and shearing sliding failure modes are considered, the tensile strength criterion is adopted to determine tensile splitting and the Hock-Brown criterion is used to judge the shearing sliding. The results of numerical example show that the action of bolting can significantly reduce the creation of tensile micro cracks and thus enhance the peak uniaxial compressive strength and restrain the lateral deformation of rock mass.