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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第2期    总第306期    2020年2月

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文章编号:1672-7207(2020)02-0433-12
变截面隧道开挖地表土体移动与沉降预测
李涛,王益博,郁志伟,刘波

(中国矿业大学(北京) 力学与建筑工程学院,北京,100083)

摘 要: 基于随机介质理论,结合直墙圆拱收敛模式,提出考虑隧道变截面情况下地表移动与沉降的预测方法。该方法将截面连接处的土体损失看作是线性渐变的,引入变截面线性过渡段,推导出隧道变截面处的地表沉降和横向水平位移方程;结合北京地铁廖公庄站现场监测数据,验证该方法的适用性。研究结果表明:本文方法能较好地预测城市地下工程变截面处地层移动与沉降变化规律;变截面处地表沉降曲线斜率随着围岩主要影响角正切与埋深的比值(tanβ/H)增大而增大,但其影响范围减小;变截面处地表沉降曲线的沉降量随着跨度R增大而增大,但其影响范围和曲线斜率不发生改变;隧道变截面处的土体纵向地表变形在一定范围内呈线性变化。

 

关键词: 隧道工程;变截面;随机介质理论;地表变形

Prediction of soil movement and settlement of excavated surface soil of variable section tunnel
LI Tao, WANG Yibo, YU Zhiwei, LIU Bo

School of Mechanics and Civil Engineering, China University of Mining & Technology, Beijing,Beijing 100083, China

Abstract:Based on the stochastic medium theory and the convergence mode of straight wall arch, a prediction method for surface movement and settlement considering the tunnel cross section was proposed. The soil loss at the joint of the variable section was considered to be linearly gradually changed, the variable section linear transition section was introduced, and the ground settlement and lateral horizontal displacement equations at the variable section of the tunnel were derived. Combined with the on-site monitoring data of Liaogongzhuang Station of Beijing Subway, the applicability of the method was discussed. The results show that the proposed method can predict the variation of stratum movement and settlement in the variable section of the urban underground engineering. The slope of the surface settlement curve increases with the increase of tanβ/H, but its influence range decreases. The settlement of the surface settlement curve at the variable section increases with the increase of the span R, but the influence range and the slope of the curve do not change. The longitudinal deformation of the soil at the variable section of the tunnel has a linear variation within a certain range.

 

Key words: tunnel engineering; variable section; stochastic medium theory; surface deformation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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