摘要
传统岩质边坡数值分析多是将边坡概化成连续均质体或离散刚性单元集合体,前者忽略了结构面的影响,后者夸大了结构面的控制效应,均难以反映真实边坡岩体中结构面存在、非贯通、随机发育的特点。节理网络有限元可以弥补这些方法的不足,通过结构面模拟能高度还原边坡结构特征,在此基础上的数值分析结果更加可靠;其优势是不仅能分析边坡应力、位移及塑性区等特征,还能给出稳定性系数、分析变形破坏的演化模式及范围。介绍了节理网络有限元的基本原理及方法,以某花岗岩边坡为例进行了具体运用。结果表明:该边坡在天然及地震工况下稳定性系数分别为1.57和1.46,处于整体稳定状态;浅表节理切割、强烈风化的松动岩体稳定性较差,易在外界因素诱发下发生滑移-拉裂式失稳。实践证明节理网络有限元法为岩质边坡稳定性研究提供了新的思路与方法。
Traditional numerical analysis could not reflect the intermittent and random discontinuities in rock slope because the slopes are generalized into continuous homogeneous body or discrete rigid units,of which the former neglects the impact of discontinuities while the latter exaggerates the control effect of discontinuities.Finite element simulation with joint network could overcome the limits by giving more reliable results such as slope stress,displacement,plastic zone,stability coefficient,as well as the evolution and range of deformation failure.In this paper,the basic principle and method of finite element simulation with joint network are introduced,and its application to a granite slope is expounded.Result suggests that the studied slope is stable in general,with the stability coefficient under natural condition and seismic condition reaching 1.57 and 1.46,respectively.Strongly-weathered loose rockmass with surface joints is of low stability.Practices show that the method provides a new idea and method for the study of rock slope stability.
作者
李源亮
任光明
刘艳领
范荣全
肖红
LI Yuan-liang;REN Guang-ming;LIU Yan-ling;FAN Rong-quan;XIAO Hong(State Key Laboratory of Geohazard Prevention and Environment Protection,Chengdu University of Technology,Chengdu 610059,China;Guangxi Communications Design Group Co. Ltd.,Nanning 530011,China;Power China Xibei Engineering Corporation Ltd.,Xi’an 710065,China;State Grid Sichuan Economic Research Institute,Chengdu 610041,China)
出处
《长江科学院院报》
CSCD
北大核心
2019年第1期78-83,共6页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(41072229)
国家电网公司科技项目(SGSCJY00JHJS2016000)
关键词
节理网络
有限元
旱寒地区
花岗岩边坡
稳定性分析
joint network
finite element
frigid and arid region
granite slope
stability analysis
