摘要
基于大型有限元软件ABAQUS,采用有限元无限元组合方法对大断面浅埋暗挖海底隧道CRD法施工进行了模拟分析,研究包括:初始地应力场分析,围岩注浆预加固,服务隧道的开挖及其影响,主隧道CRD法不同施工工序对隧道围岩、支护结构以及地表沉降的影响等。研究认为:新提出的初始地应力场定义方法较之前方法为佳;服务隧道开挖时,地表沉降成V形分布,主隧道开挖时,地表沉降变成W形分布;CRDⅠ部开挖和CRDⅡ、Ⅲ、Ⅳ部开挖引起的隧道围岩最大沉降位置不同;CRDⅡ部初期支护对围岩的变形有一定的控制作用;主隧道Ⅲ部拱顶的围岩沉降量较大;主隧道底拱角部存在应力集中和较大的塑性变形。研究结果对于类似工程的设计与施工具有一定的参考价值。
Based on the large finite element software ABAQUS, the combination method of finite element and in- finite element is used to simulate the CRD construction procedures of large-span and shallow-mining subsea tunnel. The research is mainly about initial stress field analysis, pre-grouting reinforcement of surrounding rock, excavation of service tunnel and its effect, the effect of different working procedures of CRD method on the tunnel surrounding rock mass, the support structure and the ground settlement etc.. The study suggests that： the new proposed defining meth- od of initial stress field is better than the others; during the service tunnel excavation, the ground settlement is a V- shaped distribution, however, during the main tunnels excavation, the ground settlement turns into the W-shaped dis- tribution ; the biggest settlement position of tunnel rock mass caused by the excavation part of CRD I is different from that of other parts of CRD ; the primary support of CRD lI has some controlling effect on the deformation of surround- ing rock mass ; there is a large amount of rock settlement in the vault of CRD llI; there are stress concentration and large plastic deformation zone at the comers of arch bottoms of main tunnels. Research results are of reference value for the design and construction of similar projects.
出处
《地下空间与工程学报》
CSCD
北大核心
2014年第1期136-143,共8页
Chinese Journal of Underground Space and Engineering
基金
广东省教育部科技部产学研结合项目(2012B090600046)
2013年广州市科技计划项目(绿色建筑工程技术研究开发中心2013 J4300024
绿色建筑产学研合作创新平台2013Y2-00036
创新型企业2013J1400011)
关键词
大断面浅埋暗挖海底隧道
三孔隧道
CRD法
有限元无限元组合方法
地表沉降
large-section shallow-mining subsea tunnel
three-hole tunnel
CRD construction method
combina- tion method of finite element and infinite element
ground settlement
作者简介
戚玉亮（1981-），男，山东青岛人，博士，主要从事地下结构及岩土工程的研究。E-mail：cupid．7@163．com
