考虑流固耦合的隧道开挖引起地表沉降数值分析

孙厚超1，2，王国良1，杨平2*

(1.盐城工学院 土木工程学院，江苏 盐城 224051；2.南京林业大学 土木工程学院，南京 210037)

摘要：基于流固耦合分析理论，利用有限元分析软件对隧道开挖引起的地表沉降进行分析。非降水开挖方式下，考虑流固耦合效应共同作用，详细分析隧道周边地层和超前预支护加固区的主要土体特性对地表沉降及隧道结构体变形的影响。研究表明：在非降水开挖时，地表沉降、隧道拱顶下沉、隧道底部位移随着渗透系数比的增大而减小。但减小的速率也随之渗透系数比的增大而减小；随着超前预支护加固区渗漏部位的渗透系数比的增大，隧道顶部区域加固引起的地表沉降最小，两侧加固、底部加固和全部区域加固引起的地表沉降接近；地下水位变化时，超前预支护加固区周边地表沉降随着下渗总流量的增大而减小，但减小的速率也随着下渗总流量的增大而减小。此结论对富水地区采用非降水开挖隧道时的地表沉降分析提供一定的理论指导，有助于改进超前预支护和隧道排水工程的施工设计。

关键词：非降水开挖；流固耦合；数值分析；渗透系数；沉降

中图分类号：S 773.3

文献标识码：A

文章编号：1001-005X(2015)03-0112-06

Abstract：Based on the coupled fluid-solid theorem，numerical analysis for the tunneling-induced land subsidence computation was done with finite element analysis.Considering fluid-structure coupling effect，the rules of influence of the main soil characteristics of surrounding strata and advanced support reinforced zones to surface subsidence of soil and the deformation of tunnel structure were analyzed in detail for the tunneling without dewatering.The results showed that the land tends to subsidence，and the displacement of tunnel decreased as the permeability coefficient increased.But the decline rate also reduced with the increase of permeability coefficient.As the permeability coefficient of strengthened leakage section increased，the land subsidence of the enhanced area of tunnel decreased.The land subsidence at the lateral enhanced area，bottom enhanced area，and all enhanced area were almost the same.When the ground water level changed the land settlement of enhanced area decreased as the leaking amount increased.But the decreasing rate reduced as the leaking amount increased.The research results can provide certain theoretical guidance for tunneling without dewatering in water abundant area，which is helpful for improving the design and construction level of advanced support and tunnel drainage.

Keywords：tunneling without dewatering；coupled fluid-solid；numerical analysis；permeability coefficient；settlement

收稿日期：2014-12-18

基金项目：住房与城乡建设部科技开发项目(2014-K4-024)

作者简介：第一孙厚超，博士, 高级工程师。研究方向：岩土与地下工程。

通讯作者：`*杨平，博士，教授，研究方向：岩土与地下工程。E-mail:yangping@njfu.edu.cn

Numerical Analysis of Tunneling-Induced GroundSettlement with Consideration of Fluid-Solid Coupling

Sun Houchao1，2，Wang Guoliang1，Yang Ping2*

(1.College of Civil Engineering，Yancheng Institute of Technology，Yancheng 224051，Jiangsu Province；

2.College of Civil Engineering，Nanning Forestry University，Nanjing 210037)

引文格式：孙厚超，王国良，杨平，等.考虑流固耦合的隧道开挖引起地表沉降数值分析[J].森林工程，2015，31(3)：112-116.