克泥效特性试验及其在盾构穿越施工中的应用

唐璇; 邵小康; 谢维; 付晓峰; 陈越; 蔡子峰; 张雷

doi:10.3973/j.issn.2096-4498.2023.04.006

隧道建设 >

2023 , Vol. 43 >Issue 4: 602 - 610

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.04.006

研究与探索

克泥效特性试验及其在盾构穿越施工中的应用

唐璇 ,
邵小康 ,
谢维 ,
付晓峰 ,
陈越 ,
蔡子峰 ,
张雷

展开

（1. 中铁大桥局集团有限公司，湖北武汉 430050； 2. 中国矿业大学（北京）力学与建筑工程学院，北京 100083）

唐璇（1987—），男，湖南永州人，2010年毕业于南华大学，城市地下工程专业，本科，高级工程师，现从事隧道及地下工程管理工作。E-mail： Anboil@126.com。*通信作者: 邵小康, E-mail: xiaokang.shao@outlook.com。

网络出版日期: 2023-05-23

收起

Performance Test of Clay Shock and Its Application in Shield Undercrossing Construction

TANG Xuan ,
SHAO Xiaokang ,
XIE Wei ,
FU Xiaofeng ,
CHEN Yue ,
CAI Zifeng ,
ZHANG Lei

Expand

(1. China Railway Bridge Bureau Group Co., Ltd., Wuhan 430050, Hubei, China; 2. School of Mechanics and Civil Engineering, China University of Mining and Technology Beijing, Beijing 100083, China)

Online published: 2023-05-23

Fold

摘要

为研究盾构掘进过程中克泥效浆液对开挖间隙的充填及其减小地层变形的作用机制，结合北京地铁17号线盾构隧道超近距离穿越北京首都国际机场线既有运营隧道的工程实例，采用物理、力学特性试验和数值模拟计算等方法，对盾构下穿既有隧道施工时的变形规律与克泥效工法的作用机制开展研究。结果表明： 1）随着克泥效浆液质量浓度的增大，其渗透性明显减小；当克泥效浆液的质量浓度为400 kg/m3时，能够阻止同步注浆浆液向前流窜，对开挖间隙的充填、支护效果最佳。2）克泥效浆液能使盾壳与土体之间的摩擦力降低50%，并且能够避免盾壳周边土体发生超固结而出现剪切破坏和体积膨胀，从而减小下穿施工过程中对既有线结构的影响。3）在盾尾脱出后15环之内使用水泥-水玻璃1〖KG-*5〗∶〖KG-*5〗1配比的双液浆进行径向注浆，能有效减小既有隧道沉降。〖JP2〗4）数值模拟结果揭示出采用克泥效浆液充填盾构开挖间隙后不仅能大幅减小施工沉降，还能有效抑制沿隧道轴线方向的地层位移。

关键词： 盾构隧道; 近距离穿越; 克泥效工法; 室内测试; 数值模拟

本文引用格式

唐璇 , 邵小康 , 谢维 , 付晓峰 , 陈越 , 蔡子峰 , 张雷 . 克泥效特性试验及其在盾构穿越施工中的应用[J]. 隧道建设, 2023 , 43(4) : 602 -610 . DOI: 10.3973/j.issn.2096-4498.2023.04.006

Abstract

A case study is conducted on a shield tunnel of Beijing metro line 17 undercrossing the existing operating tunnel of the Beijing Capital International Airport Line with a small space to investigate the clay shock performance and its mechanism of controlling the settlement of the shield excavation gap filling. The physicomechanical test and numerical simulation calculation methods are adopted to investigate the tunnel deformation and the clay shock mechanism. The results show that: (1) The permeability significantly decreases with increasing clay shock slurry concentration; the synchronous grouting slurry could be prevented from flowing forward at a clay shock solution concentration of 400 kg/m3, and the best filling and supporting effects of the excavation gap are observed. (2) The clay shock slurry can reduce the friction between the shield shell and the surrounding soil by 50% and avoid the shear failure and the volume expansion caused by the overconsolidation of soil, thereby minimizing the influence on the existing tunnel in the process of undercrossing construction. (3) The settlement of the existing tunnel can be effectively reduced by using doublecomponent slurry with a cement〖KG-*5〗∶〖KG-*5〗sodium silicate ratio of 1〖KG-*5〗∶〖KG-*5〗1 for radial grouting within 15 rings after the shield tail passes. (4) The numerical simulation results reveal that the construction settlement can be significantly reduced when the excavation gap is filled with grout, and the stratum displacement along the tunnel axis can also be effectively inhibited.

Key words： shield tunnel; undercrossing with small space; clay shock method; laboratory test; numerical modeling

Options

文章导航

〈

〉

模态框（Modal）标题

摘要

本文引用格式

Abstract