竖井地面预注浆帷幕安全厚度研究及其在隧道通风井中应用:以天山胜利隧道4号通风竖井为例

毛锦波; 赵红刚; 韩强; 姬中奎; 张斌斌; 李亚隆

doi:10.3973/j.issn.2096-4498.2024.02.005

隧道建设 >

2024 , Vol. 44 >Issue 2: 266 - 273

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.02.005

研究与探索

竖井地面预注浆帷幕安全厚度研究及其在隧道通风井中应用:以天山胜利隧道4号通风竖井为例

毛锦波 ,
赵红刚 ,
韩强 ,
姬中奎 ,
张斌斌 ,
李亚隆

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(1. 中交二公局东萌工程有限公司，陕西西安 710119； 2. 中煤科工西安研究院（集团）有限公司，陕西西安 710077)

毛锦波（1982—），男，陕西西安人，2004年毕业于河北工程大学，土木工程专业，本科，正高级工程师，主要从事隧道与地下工程领域的施工及管理工作。E-mail： fluiway@163.com。

网络出版日期: 2024-03-11

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Safe Thickness of Pregrouting Curtain for Vertical Shaft Ground and Its Application in Tunnel Ventilation Shaft: A Case Study of No. 4 Ventilation Shaft of Tianshan Shengli Tunnel

MAO Jinbo ,
ZHAO Honggang ,
HAN Qiang ,
JI Zhongkui ,
ZHANG Binbin ,
LI Yalong

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(1. CCCCSHEC Dong Meng Engineering Co., Ltd., Xi′an 710119, Shaanxi, China; 2. CCTEG Xi′an Research Institute (Group) Co., Ltd., Xi′an 710077, Shaanxi, China)

Online published: 2024-03-11

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摘要

针对天山胜利隧道4号通风竖井穿越富水地层施工难、风险高的问题，采用地面预注浆技术构筑注浆帷幕。首先，考虑竖井开挖过程中的爆破扰动效应，将地面预注浆帷幕体安全厚度划分为无效厚度与有效厚度，并构建水平地层压力和孔隙水压共同作用下的注浆帷幕体力学分析模型。然后，基于弹塑性力学理论，分析有效注浆帷幕体的径向位移；同时，通过预测竖井开挖爆破后围岩粉碎区范围，确定注浆帷幕体的无效厚度。最后，运用厚壁圆筒理论，结合有效注浆帷幕体在弹塑性交界面处的位移协调条件，确定注浆帷幕体的有效厚度，并验算注浆帷幕体强度及稳定性。将上述理论应用到天山胜利隧道4号通风竖井，确定其注浆帷幕体安全厚度为6.5 m。现场监测结果表明，该厚度满足工程要求，堵水效果良好。

关键词： 天山胜利隧道; 通风竖井; 地面预注浆; 注浆帷幕; 安全厚度

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毛锦波 , 赵红刚 , 韩强 , 姬中奎 , 张斌斌 , 李亚隆 .

竖井地面预注浆帷幕安全厚度研究及其在隧道通风井中应用:以天山胜利隧道4号通风竖井为例

[J]. 隧道建设, 2024 , 44(2) : 266 -273 . DOI: 10.3973/j.issn.2096-4498.2024.02.005

Abstract

The No.4 ventilation shaft of the Tianshan Shengli tunnel intersects a waterrich stratum, presenting high construction challenges and risks. To mitigate this issue, a ground pregrouting technology is employed to create a grouting curtain. Considering the blasting disturbance effect during shaft excavation, the safe thickness of the ground pregrouting curtain is categorized into invalid and effective thicknesses. A mechanical analysis model of the grouting curtain is established under the combined action of horizontal formation pressure and pore water pressure. Subsequent analysis of the radial displacement of the effective grouting curtain is conducted using the elasticplastic mechanics theory. The invalid thickness of the grouting curtain is determined by predicting the range of the surrounding rock′s crushing area post shaft excavation blasting. Utilizing the thickwalled cylinder theory and considering the displacement coordination condition of the effective grouting curtain at the elasticplastic interface, the effective thickness of the grouting curtain is determined and strength and stability of the curtain are verified. This theory is applied to the calculation of the safe thickness of the grouting curtain for the No.4 ventilation shaft of the Tianshan Shengli tunnel, which is determined to be 6.5 m. The field test outcomes affirm that the thickness of the grouting curtain meets the engineering requirements and curtain′s water stop effect is good, thereby ensuring the safe and rapid construction of ventilation shafts.

Key words： Tianshan Shengli tunnel; ventilation shaft; ground pregrouting; grouting curtain; safe thickness

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