铁道标准设计2017，Vol.61Issue(11)：61-66,70,7.DOI:10.13238/j.issn.1004-2954.2017.11.013
强震区成兰铁路某隧道小净距段大变形特性分析
Analysis of Large Deformation Characteristics of a Small Spacing Section Tunnel of Chengdu-Lanzhou Railway in Meizoseismal Area
摘要
Abstract
The D3K87+500 ～+350 section of small spacing tunnel with obvious large deformation is located between front active fault and central active fault of Longmen mountain fault zone in" Wenchuan 5.12" meizoseimal area and the No.4 adit area of Shiziyuan tunnel,which is under construction as part of the Chengdu-Lanzhou railway.Based on the analysis of the datum of the survey,rock tests,geo-stress test,and monitoring measurements,the large deformation characteristics in perspective of geological structure,surrounding rock,earthquake action,geo-stress field,underground water,engineering structure type,and construction influence,the formation mechanism of large deformation is studied.Main research conclusions are as follows:(1) the small spacing section are characteristic of longitudinal tension crack deformation,inverted arc shear dislocation,side wall intrusion and arch crown settlement;(2) the formation mechanism of large deformation can be summarized as the comprehensive effect of the objective geological environment factors such as the soft and broken surrounding rock condition,complex and active geological structure condition,high geo-stress field condition,topographic bias action,groundwater softening action,and the subjective factors such as the small spacing tunnel structure type,left and right tunnel construction mutual influence,and weak support measures;(3) the setting position of small spacing tunnel structure should comprehensive consider the following objective geological environment factors such as formation lithology,geological structure,geo-stress field,and earthquake shattering action;(4) the conclusions of this paper can be widely applied in the design and construction of soft and broken surrounding rock tunnels under similar geological conditions of the Sichuan-Tibet railway and the Yunnan-Tibet railway in meizoseismal areas.关键词
强震区/成兰铁路/小净距隧道/构造应力/成因机制Key words
Meizoseismal areas/Chengdu-Lanzhou railway/Small spacing tunnel/Tectonic stress/Formation mechanism分类
交通工程引用本文复制引用
宋章,陶玉敬,杜宇本,袁传保..强震区成兰铁路某隧道小净距段大变形特性分析[J].铁道标准设计,2017,61(11):61-66,70,7.基金项目
国家铁路局科技研究计划(KF2015-007) （KF2015-007）
中铁二院工程集团有限责任公司科研项目(院计划14126005(14-17)) （院计划14126005(14-17）
