Hoek-Brown准则在岩石强度各向异性评价中的应用Application of Hoek-Brown Criterion in the Evaluation of Rock Strength Anisotropy
周广照;彭云晖;许思勇;冉晓军;李平;
摘要(Abstract):
完整岩石强度随非连续界面角度发生变化而变化,因此具有各向异性。修正的Hoek-Brown准则可以对岩石的强度各向异性特征进行合理预测。通过对沉积岩及变质岩两大岩类、共23组岩样单、三轴测试结果进行分析,获取相应强度各向异性参数Kβ及Rc,结果表明:岩石各向异性强弱与原岩类型、压实和胶结等沉积成岩作用、微裂隙发育程度及变质作用等因素有关。对于结构完整的沉积岩石,煤岩的各向异性最强,其次为页岩,而砂岩、泥岩和灰岩的各向异性相对较低。变质岩中板理发育的板岩各向异性最强,片麻岩次之,片岩和大理岩的各向异性相对较低。K_(min)与Rc间满足幂指数关系,K_(90)/K_(min)与Rc间满足线性关系,建立了各向异性岩石K_(min)分类标准。最后利用Londe转换和σcβ预测效果验证了修正的Hoek-Brown准则方程具有较高预测精度,结果可靠,从而为岩石强度各向异性更深入研究提供参考和依据。
关键词(KeyWords): Hoek-Brown准则;强度各向异性;成岩作用;微裂隙;变质作用;评价
基金项目(Foundation):
作者(Author): 周广照;彭云晖;许思勇;冉晓军;李平;
Email:
DOI: 10.19509/j.cnki.dzkq.2017.0238
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