含厚层软弱夹层硬质围岩的变形破坏特性  

Deformation and Damage Characteristics of Hard Rock Mass with Thick Weak Interlayer

作　　者：王益壮[1] 李晓昭[1,2] 章杨松[3] 赵晓豹[1,2] 袁亮[1] 程晋源[2] 

机构地区：[1]南京大学地球科学与工程学院,南京210093 [2]南京大学-华东有色地勘局地下空间与地质环境研究所,南京210007 [3]南京理工大学土木工程系,南京210094

出　　处：《防灾减灾工程学报》2011年第4期441-449,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国防科工委"十一五"项目(科工计[2007]825);国家自然科学基金项目(40872172)资助

摘　　要：以某隧道为背景,通过地质条件分析并结合FLAC3D数值模拟手段,采用对比含有厚层软弱夹层和不含软弱夹层的2个不同模型的方法,从地应力变化、塑性区开展、变形、下覆岩体受压和位移等角度分析了含厚层软弱夹层硬质围岩的变形破坏特性。发现对于含厚层软弱夹层和不含软弱夹层的这2个不同模型,地应力的差别较小,但都为不含节理的岩体的0.5倍或更小,因此认为节理是影响含厚层软弱夹层硬质围岩变性破坏的因素之一;而2个模型在塑性区开展、变形量、下覆岩体受压和位移等方面差别较大,因此认为厚层软弱夹层对硬质围岩的变形破坏起着显著作用。同时通过创建三维模型采用分步开挖的方法,模拟了含厚层软弱夹层硬质围岩的变形破坏过程,分析认为其具有隐蔽性和发生时间不确定性的特点。研究结果可为类似地质情况的隧道建设提供参考。Based on the geological investigation,the deformation and damage characteristics of hard rock mass with thick weak interlayer of a typical tunnel is simulated using FLAC3D.Two models with and without weak interlayer are adopted to analyze the characteristics of ground stress,plastic zone,deformation of the rock mass and the displacement and pressure of underlying rock mass.The results show that stress distribution of the two models are almost the same which are 30%～50% of normal rock mass,but the plastic zone,the strain,the interface normal stress and the displacement of underlying rock mass are quite different.So it can be concluded that the joint and the weak interlayer both contribute to the deformation and damage of rock mass.At the same time,the construction and deformation process of a tunnel are si-mulated using a 3d model.The result shows that the deformation and damage have the characteristics of concealment and temporal uncertainty.This study can provide reference to other tunnels with similar geological conditions.

关 键 词：厚层软弱夹层 硬质围岩 数值模拟 围岩变形特性 时间特性 

分 类 号：TU457[建筑科学—岩土工程]