摘要
为研究基坑施工对下卧隧道结构变形影响,利用数值模拟有限元软件MIDAS计算基坑在不同开挖尺寸、开挖顺序下隧道结构变形,并对隧道结构进行实时监测.研究结果表明:基坑上部区域采取不同分块尺寸施工时,隧道结构竖向变形随基坑分块开挖尺寸增加而增加,隧道结构水平变形随基坑分块开挖尺寸增加先减小后增大;在基坑施工过程中隧道两侧基坑同时施工对控制隧道结构变形最具优势,优先施工对隧道结构产生施工扰动较小的基坑有助于控制隧道结构变形;由于隧道结构纵向与开挖基坑斜交,隧道结构距基坑边线较近的横向断面其水平变形偏大.数值模拟较好地体现了隧道结构实际变形趋势,受施工参数选取影响,隧道结构变形实测数据明显小于数值模拟结果.
In order to study the influence of foundation pit construction on the deformation of underlying tunnel structure,MIDAS is used to calculate the deformation of tunnel structure under different excavation size and excavation sequence,and the tunnel structure is monitored in real time.The results show that when the upper part of the foundation pit is constructed with different block sizes,the vertical deformation of the tunnel structure increases with the increase of the block size of the foundation pit,and the horizontal deformation of the tunnel structure first decreases and then increases with the increase of the block size of the foundation pit;In the process of foundation pit construction,the foundation pits on both sides of the tunnel are constructed at the same time,which has the most advantage to control the tunnel structure deformation;because the tunnel structure is obliquely intersected with the excavation foundation pit in the longitudinal direction,the horizontal deformation of the cross section of the tunnel structure close to the foundation pit sideline is larger.The numerical simulation better reflects the actual deformation trend of the tunnel structure.Affected by the selection of construction parameters,the measured deformation data of the tunnel structure is significantly smaller than that of the numerical simulation value.
作者
麻凤海
韩硕
MA Fenghai;HAN Shuo(College of Civil Engineering and Architecture,Dalian University,Dalian 116622,China)
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2022年第5期385-391,共7页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金(51474045)
关键词
基坑施工
隧道结构
施工顺序
分块尺寸
隧道变形
foundation pit construction
tunnel structure
construction sequence
block size
tunnel deformation
作者简介
麻凤海(1964-),男,吉林长春人,博士,教授,主要从事煤矿岩层移动理论与地表沉陷方面的研究.
