摘要
层状岩体中存在着定向结构面,导致其力学特性具有明显的各向异性。将层状岩体视为由基岩和定向结构面构成的一种宏观复合材料,以Drucker-Prager准则为基础,通过分别考虑结构面和基岩的力学性质,建立了层状岩体各向异性力学模型。该模型克服了常规层状岩体力学模型不能反映地层结构面特性及不能独立考虑基岩累进破坏特征的问题。在此基础上,提出了该模型的求解方法,基于ABAQUS二次开发,编制了计算程序,通过与经典理论进行对比,验证了该模型的有效性和实用性。将该模型应用于层状岩体地下工程的计算分析,所得结果可以较好反映层状岩体各向异性特性,且与工程实践基本相符。
The mechanical property of layered rock mass have obvious anisotropic characteristics due to the existence of regular structural surfaces. Based on the Drucker-Prager criterion, an anisotropic mechanical model of layered rock mass is established, in the model, the layered rock mass is considered as a macroscopic composite material composed by the regular structural surfaces and bedrock, and their mechanical properties are considered separately. The proposed model can depict the characteristics of structural surfaces of layers and progressive failure characteristics of bedrock, which could not be reflected by the conventional layered rock mass mechanical model. On this basis, the solving method of this model is put forward, the numerical analysis program is developed by adopting the secondary development of ABAQUS, and the effectiveness and practicability of the model is verified by contrast with the classical theory. Finally, the proposed model is used for analyzing an underground engineering at layered rock mass, the result shows that it can better reflect the anisotropie behaviors of layered rock mass, and it is basically in consistent with the engineering practice.
出处
《公路交通科技》
CAS
CSCD
北大核心
2014年第10期85-92,共8页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51009133
41102182)
国家高技术研究发展计划(八六三计划)(2012AA112502)
国家重点基础研究发展计划(九七三计划)(2014CB046905)
关键词
隧道工程
层状岩体
数值模拟
本构模型
各向异性
tunnel engineering
layered rock mass
numerical simulation
constitutive model
anisotropy
