摘 要

19世纪首次应用于矿山立井工程的人工冻结法，是深立井建设的主要工法。近年来，随着地下铁道建设的迅速发展，人工冻结法已成为软土地区地铁盾构隧道水平联络通道建设中常用的加固方法之一。以往人工冻结帷幕的设计主要建立在矿井建设的基础之上，而城市地下工程与矿井在施工深度、施工方法和受力状态都存在很大的差异，因而需要对人工冻结法在城市地下工程中的相关设计方法进行优化研究。

以工程实例来说，目前福州地铁水平联络通道设计所需要的强度、变形、热物理参数均采用上海-10℃下人工冻土指标，两地水文地质情况高度相似。根据《煤炭冻土试验规范》，对福州市区原状土进行-10℃强度、热物理数据模拟，运用ansys模型仿真得出福州市区人工冻土物理力学指标，应用于福州市区人工冻结帷幕设计优化。

地铁水平联络通道人工冻结帷幕优化研究，设计内容为冻结壁最优厚度。通过-10℃人工冻土物理力学指标参数确定冻土强度、变形、热物理参数后，根据强度控制法，考虑一定的安全系数，计算冻结壁厚度。冻结壁厚度确定后，为了验算冻结管变形是否在施工容许范围内，需要验算冻结壁最大变形是否满足施工要求。最后，根据福州市区人工冻土物理力学指标，给出福州地铁线凤山路站~福湾路站间水平联络通道人工冻结帷幕的设计方案，并对设计方案进行模拟。

关键词：水平联络通道、人工冻结法、数值模拟、结果分析。

Abstract

The method of artificial freezing, first used in mine shaft construction in the 19th century, is the main method of deep shaft construction. In recent years, with the rapid development of underground railway construction, artificial freezing method has become one of the commonly used reinforcement methods in the construction of horizontal contact channel of subway shield tunnel in soft soil area. Previous artificial freezing curtain design is mainly based on the construction of the mine, and the urban underground engineering and mines in the depth of the construction, the construction method and the stress state is a big difference, so they need to the artificial freezing method in city underground engineering in the relevant study on optimization design method.

With an engineering example, the current level of Fuzhou subway connecting passage design needs to adopt the strength, deformation, thermal physical parameters in Shanghai -10℃under the artificial frozen soil indicators, both highly similar hydrogeological situation. According to the coal test specification of permafrost, undisturbed soil in Fuzhou city -10℃ strength, thermal physical data simulation, simulation using ansys model concludes that Fuzhou city of artificial frozen soil physical and mechanical indexes, applied in Fuzhou urban artificial freezing curtain design optimization.

Study on optimization of artificial freezing curtain of horizontal contact channel of subway, the design content is optimal thickness of frozen wall. Through -10℃ to determine the parameters of artificial frozen soil physical and mechanical indexes, the frozen soil strength, deformation, thermal physical parameters according to the intensity control, consider a certain safety factor, calculate the thickness of frozen wall. After the thickness of the frozen wall is determined, in order to check whether the deformation of the frozen pipe is within the allowable scope of construction, it is necessary to check whether the maximum deformation of the frozen wall meets the construction requirements. Finally, according to the Fuzhou city of artificial frozen soil physical and mechanical indexes, give the Fuzhou subway Fengshan road station ~ F bay road station level contact channel between artificial freezing curtain design scheme, and the schemes for the design.

KEY WORDS: level liaison channels, artificial freezing method, numerical modeling, interpretation of result.

目录

摘要................................................................3

ABSTRACT.........................................................4

目录................................................................5

第一章 绪论.........................................................6

1.1 研究背景......................................................6

1.2 研究目的......................................................6

1.3 国内外研究现状................................................6

1.3.1 冻土强度方面..............................................7

1.3.2 人工冻土热物理性质的研究 .................................9

1.3.3 人工冻土变形国内外研究...................................10

1.3.4 人工冻结帷幕设计研究现状.................................12

1.4 本文主要研究内容.............................................16

第二章 人工冻结法施工方法..........................................17

2.1 冻结法的基本原理.............................................17

2.2 人工冻结法的适用情况.........................................17

2.3 施工前准备...................................................17

2.3.1 方案的选定.............................................. 17

2.3.2 地质勘查及测绘...........................................18

2.3.3 冻结法分类...............................................19

2.4 施工流程 ....................................................21

2.5 结语.........................................................21

第三章 模型数值分析与计算原理......................................23

3.1 地铁工程概况.................................................23

3.2 地下隧道工程的相关参数.......................................24

3.2.1 联络通道的几何参数.......................................24

3.2.2 土层参数.................................................25

3.3 理论公式.....................................................27

3.3.1 人工冻结帷幕理论计算.....................................27

3.3.2 冻结壁变形验算...........................................29

3.3.3 小结.....................................................29

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