铁道标准设计2018，Vol.62Issue(3)：89-95,7.DOI:10.13238/j.issn.1004-2954.201704100007
小净距左右不同跨度隧道施工对上部建筑物变形影响分析
Analysis of the Influence of the Construction of neighborhood Tunnel with Different Left and Right Span on the Upper Building Deformation
摘要
Abstract
Based on the Yuzhong connecting tunnel of Chongqing city river bridge, this paper uses the finite element software ANSYS to establish a 3D tunnel model, including the upper building. With the left hole excavated first of center diagram method and arc heading reserved core soil method(mode Ⅰ), the left hole excavated first of the ultra short step method and arc heading reserved core soil method(modeⅡ) and the right hole excavated first of center diagram method and arc heading reserved core soil method (mode Ⅲ), the displacement variation law of different left and right span of the neighborhood tunnel and the construction influence on the upper building are calculated respectively. The results show that under three conditions the most adverse effect of the tunnel construction on the upper building occurs in the period when the left and right tunnels are interconnected. The influence laws guiding the horizontal displacement and vertical displacement of the upper building are roughly identical. Compared with the working condition Ⅲ,the horizontal offset under working conditionⅠis decreased by 21.1% and the settlement is increased by 0.2%, and the corresponding values under working condition Ⅱ are 19.44% and 0.29%; the displacement along the height of the building increases gradually during tunnel construction, but the growth rate is slow;under working condition Ⅲ the percentages of settlement increase along the height of the building are 5.73%,9.32% and 10.46% Respectively;when the surrounding rock is good with proper support and unsymmetrical ground surface load,it should be more reasonable to excavate first the side of the tunnel farther away from the building.关键词
小净距隧道/施工方法/变形影响/建筑物Key words
Neighborhood tunnel/Construction method/Deformation effect/Building分类
交通工程引用本文复制引用
张学富,彭涛..小净距左右不同跨度隧道施工对上部建筑物变形影响分析[J].铁道标准设计,2018,62(3):89-95,7.基金项目
重庆市教委科学技术研究资助项目(KJ1705144) （KJ1705144）
重庆市高校优秀成果转化资助项目(KJZH17120) （KJZH17120）
贵州省交通运输厅科技项目(2017-123-011) （2017-123-011）
重庆市科委基础与前沿研究资助项目(cstc2014jcyjA30023) （cstc2014jcyjA30023）
