基于峰后特征的深部隧道围岩分层断裂数值分析
发布时间：2018-12-10 17:19
【摘要】：为了揭示深部隧道工程围岩的分层断裂机理而展开数值实验研究.分析了深部地层岩体历史及赋存环境,认为深部岩体在力学上处于峰后阶段,根据岩石峰后应力-应变特征选定了围岩的峰后特征指标及其开挖响应方程.建立了数值实验模型,设计了开挖数值模拟的围岩响应监控方案.完成了大量的开挖数值模拟,实现了深部围岩分层断裂现象在数值模拟中的重现.基于实验中围岩应力、变形分布的全程监测结果,在确定围岩分层断裂产生条件的基础上,进一步研究得到了围岩分层断裂层数、分层断裂圈半径、最大峰值应力等参数与峰后特征指标的关系.根据地下结构开挖围岩应力重分布及岩石力学破裂机理,分析了分层断裂中次生自由面、多重似开挖面形成的力学机制.所得数值模拟结果,为深部工程围岩的分层断裂提供了验证依据,消解了长期以来数值模拟中没有观察到分层断裂现象的困惑.
[Abstract]:In order to reveal the stratified fracture mechanism of surrounding rock in deep tunnel engineering, numerical experiments were carried out. The history and occurrence environment of deep rock mass are analyzed. It is considered that the deep rock mass is in the post-peak stage in mechanics. According to the post-peak stress-strain characteristics of rock, the post-peak characteristic index and the excavation response equation of surrounding rock are selected. The numerical experimental model is established and the monitoring scheme of surrounding rock response is designed. A large number of numerical simulation of excavation has been completed, and the phenomenon of stratified fracture of deep surrounding rock has been reproduced in the numerical simulation. Based on the monitoring results of the stress and deformation distribution of surrounding rock in the experiment, and on the basis of determining the conditions for the formation of stratified fracture of surrounding rock, the number of stratified fracture layers and the radius of the stratified fracture circle of surrounding rock are further studied. The relationship between the parameters such as the maximum peak stress and the characteristic index after the peak. Based on the stress redistribution of the surrounding rock in underground structure excavation and the mechanism of rock mechanics fracture, the mechanism of forming secondary free surface and multiple excavation surface in stratified fracture is analyzed. The obtained numerical simulation results provide a basis for verification of the stratified fracture of surrounding rock in deep engineering and resolve the puzzlement of stratified fracture which has not been observed in the numerical simulation for a long time.
【作者单位】： 湖南大学土木工程学院;长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金资助项目(51378195,51078136) 深部岩土力学与地下工程国家重点实验室资助项目(SKLGDUEK0915)
【分类号】：U451.2
本文编号：2370940
[Abstract]:In order to reveal the stratified fracture mechanism of surrounding rock in deep tunnel engineering, numerical experiments were carried out. The history and occurrence environment of deep rock mass are analyzed. It is considered that the deep rock mass is in the post-peak stage in mechanics. According to the post-peak stress-strain characteristics of rock, the post-peak characteristic index and the excavation response equation of surrounding rock are selected. The numerical experimental model is established and the monitoring scheme of surrounding rock response is designed. A large number of numerical simulation of excavation has been completed, and the phenomenon of stratified fracture of deep surrounding rock has been reproduced in the numerical simulation. Based on the monitoring results of the stress and deformation distribution of surrounding rock in the experiment, and on the basis of determining the conditions for the formation of stratified fracture of surrounding rock, the number of stratified fracture layers and the radius of the stratified fracture circle of surrounding rock are further studied. The relationship between the parameters such as the maximum peak stress and the characteristic index after the peak. Based on the stress redistribution of the surrounding rock in underground structure excavation and the mechanism of rock mechanics fracture, the mechanism of forming secondary free surface and multiple excavation surface in stratified fracture is analyzed. The obtained numerical simulation results provide a basis for verification of the stratified fracture of surrounding rock in deep engineering and resolve the puzzlement of stratified fracture which has not been observed in the numerical simulation for a long time.
【作者单位】： 湖南大学土木工程学院;长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金资助项目(51378195,51078136) 深部岩土力学与地下工程国家重点实验室资助项目(SKLGDUEK0915)
【分类号】：U451.2
【相似文献】
相关期刊论文 前2条
1 郭建新;高永涛;;软破岩隧道围岩峰后剪胀变形及支护设计[J];西安科技大学学报;2010年03期
2 ;集装箱运输:运价震荡运行[J];中国船检;2010年04期
相关会议论文 前2条
1 陈韦志;陈立宪;陈尧中;巫奇槙;;应用电子斑点干涉术研探类岩于双刀贯切破坏之行为[A];第九届海峡两岸隧道与地下工程学术及技术研讨会论文集[C];2010年
2 章杨松;李晓昭;阎长虹;;考虑应变软化的隧道围岩稳定性分析[A];岩石力学与工程的创新和实践：第十一次全国岩石力学与工程学术大会论文集[C];2010年
相关博士学位论文 前3条
1 韩建新;基于应变软化模型的岩体峰后变形特性和隧洞结构稳定性研究[D];山东大学;2012年
2 郭富利;堡镇软岩隧道大变形机理及控制技术研究[D];北京交通大学;2010年
3 张结红;高应力软岩隧道施工过程力学效应规律及围岩控制研究[D];长安大学;2012年
，本文编号：2370940
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2370940.html
