西安建筑科技大学学报(自然科学版)

针对既有地下结构形成的有限区域,研究盾构隧道施工引起土体位移的解析计算方法.根据有限区域盾构隧道施工引起土体位移的分布特征,从有限区域土体位移分布基本特征出发,基于半无限空间盾构隧道土体位移解析解,通过引入广义土体损失和应力边界条件,推导得到一种可以计算有限区域盾构隧道土体位移的解析计算方法,并通过一则工程实例对该方法的有效性进行验证.计算结果表明,有限区域盾构隧道土体位移小于半无限空间盾构隧道土体位移,但两种情况下的土体位移分布形状基本相同.对于有限区域盾构隧道土体位移,和半无限空间解析解相比,本文解析计算方法得出的结果更接近工程实测数据,对计算有限区域盾构隧道土体位移问题更有效.

This paper presents an analytic solution for calculating soil displacement induced by shield tunneling in finite soil which is limited by underground structures. Given the basic characteristics of soil displacement around shield tunnel in finite soils, an analytic calculation method for soil displacement in finite soil is obtained based on the analytic solution in semi-infinite soil, considering generalized ground loss and stress boundary condition. Then the effectiveness of the proposed method is evaluated by a realistic project. It proves that the soil displacement in finite soil is smaller than that in semi-infinite soil, while the distribution law of soil displacement in the two conditions is similar. The calculation results show that the outcome of the suggested method is closer to monitoring data compared with that of the method for semi-infinite soil. The proposed method in this paper has the advantages to calculate soil displacement induced by shield tunneling in finite soil.

引言
1 有限区域盾构隧道土体位移基本特征
2 有限区域土体位移解析解
3 算例分析
4 结论

图1 有限区域盾构隧道<br/>Fig.1 Shield tunnel in finite soil

图1 有限区域盾构隧道
Fig.1 Shield tunnel in finite soil

图2 有限区域盾构施工引起的土体体积变化<br/>Fig.2 Soil volume change induced by shield tunnel in finite soil

图2 有限区域盾构施工引起的土体体积变化
Fig.2 Soil volume change induced by shield tunnel in finite soil

图3 有限区域盾构施工土体位移计算<br/>Fig.3 Calculation of soil displacement in finite soil

图3 有限区域盾构施工土体位移计算
Fig.3 Calculation of soil displacement in finite soil

图4 地下道路整体下沉引起的地表沉降<br/>Fig.4 Ground surface settlement induced by underground road subsidence

图4 地下道路整体下沉引起的地表沉降
Fig.4 Ground surface settlement induced by underground road subsidence

图5 工程结构横断面<br/>Fig.5 Cross section of the project structure

图5 工程结构横断面
Fig.5 Cross section of the project structure

表1 土层特性参数
Tab.1 Soil parameters

图6 土体沉降水平向分布<br/>Fig.6 Horizontal distribution of soil settlement

图6 土体沉降水平向分布
Fig.6 Horizontal distribution of soil settlement

图7 土体沉降竖向分布<br/>Fig.7 Vertical distribution of soil settlement

图7 土体沉降竖向分布
Fig.7 Vertical distribution of soil settlement

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备注

引言

1 有限区域盾构隧道土体位移基本特征

2 有限区域土体位移解析解

3 算例分析

4 结论

期刊信息