系统锚杆对节理岩体等效凝聚力影响数值试验初探

将加锚节理岩体等效弹黏塑性模型改进为等效黏弹塑性模型,分别采用Maxwell元件、Kel-vin元件和Bingham元件串联来描述岩石、节理和锚杆的瞬时弹性变形、黏弹性变形和黏塑性变形,推导了相应的有限元计算公式,并研制了相关的有限元计算程序,然后采用数值试验方法研究了系统锚杆对节理岩体等效凝聚力的影响,认为系统锚杆对节理岩体等效凝聚力的贡献与岩体的硬软、锚杆的体积占有率、节理间距、节理倾角、锚杆倾角和受力状态等有关。

Preliminary Study of Reinforced Effect for Jointed Rock’s Equivalent Cohesion with System Anchor Rod by Numerical Test

On the basis of the improvement of equivalent elasto viscoplasticity model of bolted jointed rock to the equivalent visco elasto plasticity model,the instant elastic deformation,viscoelastic deformation and viscoplasticity deformation of rock,joint and bolt were described by using of Maxwell model,Kelvin model as well as Bingham model in series;the corresponding formulas were deduced and the corresponding FEM computational program was developed as well,then reinforced effect for jointed rock’s equivalent cohesion with system anchor rod was studied by numerical test.Reinforcement effect for jointed rock’s equivalent cohesion with system anchor rod in many factors,such as jointed rock’s rigidity,bolt occupancy rate,joint’s dip angle,joint spacing,system bolt’s dip angle and jointed rock’s stress state and so on,were discussed.