温州软黏土结构性评价及盾构隧道施工扰动研究

卢生安; 王威; 肖力

doi:10.13204/j.gyjzG23051908

温州软黏土结构性评价及盾构隧道施工扰动研究

doi: 10.13204/j.gyjzG23051908

1. 温州市铁路与轨道交通投资集团有限公司, 浙江温州 325003;
2. 浙江大学滨海与城市岩土工程研究中心, 杭州 310058

基金项目:

国家自然科学基金项目(51978611)。

详细信息

作者简介:
卢生安,男,1982年出生,高级工程师。电子信箱:shengan_lu123@163.com

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出版历程
- 收稿日期: 2023-05-19

Evaluation of Soil Structure Characteristics of Wenzhou Soft Clay and Analysis of Tunnelling Disturbance with Tunnel Boring Machines

1. Wenzhou Rail and Transit Investment Group Co., Ltd., Wenzhou 325003, China;
2. Zhejiang University Research Center of Coastal and Urban Geotechnical Engineering, Hangzhou 310058, China

摘要

摘要: 温州地区具有深厚的结构性软土。为研究软土地区地铁盾构隧道施工期土体的变形性状,选取温州市轨道交通M1线某区段典型软土层作为研究对象,基于重塑土的固有压缩特性,对原状样和重塑样进行固结压缩试验,分别从强度和变形特性来评价温州软土的结构性,并采用PLAXIS 3D软件建立地层-盾构隧道三维弹塑性有限元模型,研究盾构施工对结构性土层的扰动规律和扰动度分布,分析施工引起的附加扰动沉降。结果表明:温州地区软黏土具有强烈的结构性,强度和变形特性均受到结构性的影响;屈服应力无法作为判定欠固结土结构性的指标;盾构施工对土层的扰动可以分为初步发展阶段、快速发展阶段及稳定阶段,不同阶段受到不同作用的影响;盾构施工扰动可致使地层产生较大的工后附加沉降,主要集中在盾构隧道轮廓线周围的土体。因此,有必要在施工前采用针对性措施对地层进行加固。
- 结构性软土 /
- 重塑土固有压缩 /
- 盾构施工扰动 /
- 工后附加沉降
Abstract: Wenzhou has deep structural soft soil. To study the deformation of soft soil during metro tunnel construction, a typical section of the soil layer in Wenzhou Rail Transit Line M1 was taken as the research object. Based on the inherent compression characteristics of remolded soil, consolidation compression tests were conducted on intact and remolded specimens, to evaluate structure characteristics respectively from strength and deformation. Simultaneously, a three-dimensional elastic-plastic finite element model for the stratum and the shield tunnel was constructed by the software of PLAXIS 3D, to study the disturbance laws, the distribution of disturbance degrees, the additional settlement of the structural soil layer tunnelled with tunnel boring machines. The results indicated that the soft clay in the Wenzhou area was of strong structure, and the strength and deformation characteristics were influenced by the structure. The yield stress could not be used as an index to evaluate the structure of under-consolidated soil. The construction disturbance could be divided into the preliminary development stage, the rapid development stage and the stable stage, and different stages were influenced by different disturbance factors. The tunnelling with tunnel boring machines would caused larger additional settlement of strata after construction, which mainly concentrated in the soil around shield tunnels. Therefore, it was necessary to reinforce the stratum before construction.
- structural soft soil /
- inherent compression of remolded soil /
- tunnelling disturbance with tunnel boring machines /
- additional settlement after construction

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