Hoek-Brown岩体中轴对称隧洞渐变扰动分析

发布时间：2018-05-13 12:12

本文选题：岩石力学 + 通用Hoek-Brown准则　；参考：《岩石力学与工程学报》2015年S1期

【摘要】：现有的Hoek-Brown(HB)岩体地下开挖分析模型中,常将通用HB准则(2002版)的扰动因子D取为一固定值,与之不同之处在于将该因子从洞室开挖面至弹塑性分界面按渐进衰减考虑。结合非线性的非关联流动法则,给出了轴对称隧洞的临界支护压力、塑性区半径、应力和位移评价公式,相应的值可通过数值积分法获得。对节理岩体中洞室开挖爆破损伤和应力释放所致的渐变扰动分析,所提模型实质是对围岩塑性区软化问题的描述。算例表明,模型对D进行不同处理,也可得到轴对称隧洞理想塑性和弹脆塑性情况的分析解,为实际工程检验爆破开挖面附近岩体渐变扰动程度提供了理论解参考。
[Abstract]:In the existing analysis model of Hoek-Brown (B) rock mass underground excavation, the perturbation factor D of the general HB criterion (2002) is usually taken as a fixed value, and the difference is that the factor is considered as gradual attenuation from the excavation surface to the elastoplastic interface. Combined with the nonlinear non-correlated flow rule, the critical support pressure, plastic zone radius, stress and displacement evaluation formulas of axisymmetric tunnel are given. The corresponding values can be obtained by numerical integration method. For the analysis of the gradual disturbance caused by blasting damage and stress release in jointed rock mass excavation, the proposed model is essentially a description of the softening problem in the plastic zone of surrounding rock. The numerical examples show that the analytical solutions of the ideal plasticity and elastic-brittle ductility of axisymmetric tunnel can also be obtained by the different treatment of D by the model, which provides a theoretical reference for checking the degree of progressive disturbance of rock mass near the blasting excavation surface in practical engineering.
【作者单位】：四川大学水力学与山区河流保护国家重点实验室;
【基金】：国家自然科学基金资助项目(40972190) 国家重点基础研究发展计划(973)(2010CB732005)项目
【分类号】：TU45

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