小净距爆破对邻近空洞隧道动力响应影响研究

黄晓明; 王欢; 何艳芳; 曾卓; 薛育阳; 谢卓雄; 汪波

doi:10.20265/j.cnki.issn.1007-2993.2024-0344

小净距爆破对邻近空洞隧道动力响应影响研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0344

黄晓明^1,,
王欢¹,
何艳芳²,
曾卓¹,
薛育阳^1, ,,
谢卓雄³,
汪波⁴

1.
广东省路桥建设发展有限公司，广东广州　510000
2.
中交第一公路勘察设计研究院有限公司，陕西西安　710075
3.
广东省交通规划设计研究院集团股份有限公司，广东广州　510440
4.
极端环境岩土和隧道工程智能建养全国重点实验室，四川成都　610031

基金项目: 广东交通集团科技项目（JT2022YB26）

详细信息

作者简介:
黄晓明，男，1991年生，硕士，工程师，主要从事岩土工程方向研究。E-mail：328357301@qq.com

通讯作者:
薛育阳，男，1998年生，硕士，主要从事桥梁与隧道工程方向研究。E-mail：798904007@qq.com

中图分类号: U455.6
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出版历程
- 收稿日期: 2024-07-24
- 修回日期: 2024-10-24
- 录用日期: 2024-10-29
- 刊出日期: 2025-10-10

Influence of blasting construction of small spacing tunnel on dynamic response of cavity tunnel

1.
Guangdong Road and Bridge Construction and Development Co., Ltd., Guangzhou 510000, Guangdong, China
2.
CCCC first Highway Survey and Design Research Institute Co., Ltd., Xi’an 710075, Shaanxi, China
3.
Guangdong Communication Planning & Design Institute Group Co., Ltd., Guangzhou 510440, Guangdong, China
4.
State Key Laboratory of Intelligent Geotechnics and Tunnelling, Chengdu 610031, Sichuan, China

摘要

摘要: 依托既有旦架哨隧道改扩建工程，基于隧道衬砌后缺陷实际分布规律，研究了不同围岩级别下衬砌背后空洞的分布位置和尺寸对结构爆破振动响应规律的影响。研究结果表明：不同分布位置、不同尺寸及不同围岩级别下衬砌后空洞对既有隧道衬砌振动响应的影响均不相同。从空洞分布位置分析，拱顶衬砌背后空洞对振速和应力的放大效应均大于拱腰空洞；从空洞分布尺寸分析，空洞越大，对振速的放大效应越大，而对应力的放大效应反之；从不同围岩级别下衬砌背后存在空洞时分析，围岩越差（围岩级别越大），空洞处对振速和应力的放大效应越显著。综合分析建议，实际工程中以振速作为新建隧道爆破施工过程中邻近空洞隧道的安全控制基准表征值时，应依据空洞出现的位置、大小及围岩情况适当降低空洞处振速控制值。
- 小净距隧道 /
- 改扩建 /
- 爆破 /
- 空洞 /
- 动力响应 /
- 控制基准
Abstract: Based on the reconstruction and expansion project of the existing Danjiashao tunnel, and considering the actual distribution law of the defects after the lining of the existing tunnel, the influence of different distribution positions and sizes of the cavities behind the lining on the response law of structural blasting vibration under various surrounding rock conditions was studied. The results show that the influence of the cavity behind the lining on the vibration response of the existing tunnel lining is different under different distribution positions, various sizes, and surrounding rock conditions. From the analysis of the distribution position of the cavity, the amplification effect of the cavity behind the vault lining on the vibration velocity and stress is greater than that of the arch waist cavity; from the analysis of the distribution size of the cavity, the larger the cavity is, the greater the amplification effect on the vibration velocity is, and the amplification effect on the stress is the opposite. From the analysis of the existence of voids behind the lining under different surrounding rock levels, the worse the surrounding rock (the higher the surrounding rock level), the more significant the amplification effect of the cavity on the vibration velocity and stress. The comprehensive analysis suggests that when the vibration velocity is used as the safety control reference value of the adjacent cavity tunnel during the blasting construction of the new tunnel, the vibration velocity control value at the cavity should be appropriately reduced according to the location, size, and surrounding rock condition of the cavity.
- small spacing tunnel /
- reconstruction and expansion /
- blasting /
- cavity /
- dynamic response /
- control benchmark

HTML全文

图 1 改扩建示意图

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图 2 既有隧道衬砌背后空洞典型地质图

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图 3 既有隧道衬砌背后空洞尺寸统计图

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图 4 不同围岩级别下既有隧道衬砌背后空洞分布统计图

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图 5 整体模型示意图

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图 6 爆破荷载曲线

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图 7 监测点布置

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图 8 既有隧道衬砌空洞模拟示意图

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图 9 裂缝不同分布位置对既有隧道振速响应影响

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图 10 空洞不同大小及位置对既有隧道应力响应影响

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图 11 既有隧道空洞处主拉应力云图（单位：Pa）

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图 12 不同围岩级别对既有隧道振速响应影响

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图 13 不同围岩级别下既有隧道监测点主拉应力变化

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图 14 不同围岩级别下既有隧道空洞处主拉应力云图（单位：Pa）

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表 1 空洞计算工况

工况编号	工况代号	围岩级别	病害工况说明
K1	K1	Ⅳ	无空洞
K2	K2-1		拱顶小空洞，环向长2.5 m，深0.15 m
K2	K2-2		拱顶大空洞，环向长5.0 m，深0.25 m
K3	K3-1		右拱腰小空洞，环向长2.5 m，深0.15 m
K3	K3-2		右拱腰大空洞，环向长5.0 m，深0.25 m
K4	K4	Ⅴ	无空洞
K5	K5-1		最不利位置处小空洞，环向长2.5 m，深0.15 m
K5	K5-2		最不利位置处大空洞，环向长5.0 m，深0.25 m

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表 2 材料参数表

材料类别	密度 /（kg·m^–3）	弹性模量 /GPa	泊松比	黏聚力 /MPa	内摩擦角 /（°）
Ⅴ级	2250	0.5	0.35	0.1	45
Ⅳ级	2300	0.75	0.3	0.45	55
衬砌	2380	28	0.2

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