H-B准则在隧道围岩力学参数确定中的应用

Application of Hoek-Brown Strength Criterion in Mechanical Parameters Determination of Rock Mass in the Road Tunnel

将[BQ]值引入Hoek-Brown强度准则,以改进后的Hoek-Brown强度准则确定公路隧道围岩力学参数。以中条山隧道为例,通过对比中条山隧道围岩力学参数的试验值、改进公式的计算值、相关规范的建议值,对提出的计算公式进行验证,并在此基础上对隧道结构进行有限元计算。结果表明:改进后的Hoek-Brown强度准则用于隧道围岩力学参数计算时,其计算值比试验值小,更能反映隧道围岩的真实力学状态;隧道轴力、剪力及弯矩分布均符合隧道结构的受力规律。

The correction value of basic quality index of rock mass was introduced to Hoek-Brown strength criterion, based on the improved Hoek- Brown strength criterion to determine rock mechanical parameters of tunnel. Cased on Zhongtiaoshan tunnel, the proposed calculation formula was ver- ified through the comparison of the test value, results from improved calculation formula and proposed value in related standard, and the numerical simulation was made for the tunnel structure. The results show that the calculation values can better reflect the real mechanical state of the tunnel rock, all of the tunnel axial force, shear force and bending moment distribution can better conform to the stress distribution of tunnel structure also.