,基于修正Lade-Duncan破坏准则的隧洞围岩抗力系数

基于修正的Lade-Duncan准则和非关联线性流动法则,将隧洞围岩划分为裂缝区、塑性区和弹性区4层有限环,推导出了考虑地下水渗流作用影响下的隧洞围岩抗力系数计算的通用公式。通过改变公式中的一些参数,可以得出其他围岩条件下的抗力系数计算式。由于修正的Lade-Duncan准则更适合于岩土类材料,因此根据该公式计算出的考虑了中间主应力和渗流作用影响的隧洞围岩抗力系数具有较高的实际应用价值。研究结果表明,中间主应力和渗流作用对隧洞围岩抗力系数均具有一定的影响,因而推出的通用公式在计算隧洞围岩抗力系数时具有较高的理论应用价值。

Rock resistant coefficient in tunnel based on the modified Lade-Duncan failure criteria

Based on the modified Lade-Duncan criteria and non-associated flow rule linear, dividing the tunnel surrounding rock into cracks area, plastic zone and the elastic zone 4 layer finite ring, and considering the impact of the intermediate principal stress and groundwater seepage effect, a general calculation formula of tunnel rock resistant coefficient was deduced. By changing some parameters in the formula, the similar formula can be drawn under the conditions of other tunnel rock resistance coefficient. Since the correction of Lade-Duncan criterion is more suitable for rock-like materials, therefore, according to the formula calculated, the surrounding rock resistance factor in account of the role of intermediate principal stress and seepage has high practical value. The results show that the intermediate principal stress and seepage effect have some influence on tunnel rock resistant coefficient, so it has a certain reference value in the calculation of tunnel rock resistant coefficient.