岩体结构面剪切强度模型研究进展

摘要

Discontinuity shear strength is one of the most important mechanical properties of structural surface.Nearly half a century,scholars in the field related to the subject have researched deeply and achieved fruitful results.First,the status quo model of structural shear strength is summed up and the characteristics of each model are described.And then,the each model from the essential characteristics,practicality and focus of shear strength are analyzed and evaluated.Finally,it is believed that ①the morphology of structure surface,which is an important factor affecting shear strength,is most complex and most difficult to be quantified.So,in the characterization of anisotropy of structure surface,a lot of research works remain to be done.②The reasonableness of the parameters of anisotropy and size effect about structural surface is required to verify by mechanical testing.The application of 3D printing technology can effectively solve the difficulty that the rock mass structural plane can not be tested repeatedly.It is expected to make a breakthrough in the field of anisotropy and size effect about structural plane;③Anisotropy and size effect of discontinuity shear strength should be studied by dialectical thinking.In this way,the model can help to accurately estimate the engineering shear strength of rock mass.%结构面剪切强度是结构面最主要的力学性质.近半个世纪以来,相关领域学者对结构面剪切强度模型进行了深入研究,取得了丰硕成果.首先,系统地总结了结构面剪切强度模型研究现状,并介绍了各剪切强度模型的特点.然后从剪切强度的本质特征、实用性、研究热点对模型进行了分析评价.最后分析认为:①在结构面剪切强度影响因素中,形貌特征最为复杂、定量化最为困难,特别是在各向异性表征方面仍需做大量研究工作;②结构面形貌各向异性和尺寸效应表征参数的合理性需力学试验来验证,3D打印技术的应用,可有效解决岩体结构面不可重复试验的困难,有望在结构面各向异性、尺寸效应的室内试验研究方面取得突破性进展;③结构面剪切强度的各向异性和尺寸效应特征应进行统一辩证的研究,只有这样,获得的模型才能有助于准确估算工程岩体剪切强度.