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考虑结构面特性的层状岩体复合材料模型与应用研究

期刊名称：岩石力学与工程学报，29(4)：743-756，2010.
时间：0
分类：TU45[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010, [2]二滩水电开发有限责任公司,四川成都610021
相关基金：国家自然科学基金资助项目（50909007 50639090）; “十一五”国家科技支撑计划项目（2008BAB29B01）
相关项目：深部岩体工程特性的理论与实验研究

关键词：岩石力学, 层状岩体, 结构面特性, 复合材料模型, 数值模拟, 破裂(滑移)机制, rock mechanics, layered rock mass, characteristics of structural plane, composite model, numerical simulation, failure or sliding mechanism

中文摘要：

层状岩体由于存在着定向结构面导致其破坏机制和变形行为与一般岩体相比,存在着显著的差异。为此,先通过独立考虑基岩和结构面的物理力学特性,提出层状岩体复合材料硬化-软化模型,以便用来描述这类岩体在强度和变形方面的各向异性以及渐进破裂（或滑移）特征。然后,采用VC＋＋编程语言将该模型嵌入到FLAC3D软件中,从而实现非线性数值计算功能。通过与经典理论解和已有模型数值解进行对比,以及对单轴和三轴压缩试验的数值模拟,表明该模型在描述上述这些特征方面是合适的。同时,这些压缩试验的数值模拟结果给出不同围压和倾角情况下层状岩体的力学响应特征,并初步探讨这类岩体的破裂（滑移）机制。最后,将该模型应用于典型边坡工程和洞室工程中,所得结果可以较好地解释工程现场的变形破坏现象,且与工程实践基本相符,验证该模型在工程应用方面的可行性。

英文摘要：

The common character of layered rocks is transversely isotropic due to the existence of regular bedding planes,which means that the failure mechanism and deformation characteristics of such rocks have the obvious difference with common rocks.In view of this point,a strain hardening-softening composite model of layered rock mass is proposed according to the physico-mechanical characteristics of structural plane and rock matrix,and it can be used to describe the anisotropic characteristics of rock strength and deformation,as well as progressive failure or sliding characteristics.Then,the proposed model has been successfully established and embedded on the basis of the third developing platform of constitutive model in FLAC3D,realizating nonlinear numerical calculation.The results including the comparison with classical theoretical solutions and numerical solutions,simulation of uniaxial and triaxial compressions of layered rock mass and so on prove that the proposed model is suitable for the description of the above characteristics.At the same time,the mechanical response characteristics and progressive failure processes of test blocks with different confined pressures and different dip angles are analyzed;and the failure or sliding mechanism of such rocks is discussed so as to better understand the mechanical properties.Finally,the proposed model is used to simulate a typical slope project and a cavern project;and the simulation results can be used to better explain in-situ deformation and failure phenomenon,and they are in accordance with engineering practice.It is shown that the proposed model is correct and feasible for the engineering application.

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