交替爆破开挖下分岔隧道中夹岩损伤特征研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (1) : 46-53.

论文

杨杭澎1，俞缙1，付晓强1,2，姚玮1，林聪波1，常方强1

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Damage characteristics of intercalary rock in bifurcated tunnel under alternate blasting excavation

YANG Hangpeng1, YU Jin1, FU Xiaoqiang1,2, YAO Wei1, LIN Congbo1, CHANG Fangqiang1

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文章历史 +

摘要

明确在左右交替爆破施工情况下分岔小净距隧道中夹岩损伤规律，将有助于更好地保障隧道现场施工及围岩稳定。采用三维有限差分软件FLAC3D模拟了爆破荷载作用下分岔小净距隧道交替开挖过程，重点研究了中夹岩在不同开挖工况下损伤分布及演化规律，最后通过厦门海沧疏港通道分岔隧道工程项目现场声波损伤范围检测结果进行了验证。研究结果表明：爆破产生应力波在分岔口产生反射形成拉应力，使得分岔口断面损伤更严重；隧道中夹岩损伤呈不对称“V”字分布，由中夹岩内部至轮廓线损伤逐渐增大，主隧道侧中夹岩最大损伤在90°~120°范围内，匝道侧中夹岩最大损伤在90°范围内，中夹岩厚度对中夹岩损伤有较大影响，随着厚度的增加中夹岩损伤程度降低且损伤范围未贯通左右隧道；通过模拟改变不同进尺、开挖错距及开挖顺序发现，与2m进尺相比，5m进尺完全损伤区提高了58.5%，损伤贯通区提高了70%，错距1步较错距4步工况完全损伤区增加了1.27m，损伤贯通范围也出现一定增加，先开挖较小断面有利于中夹岩稳定，围岩损伤对称性较好，但远离中夹岩一侧岩体损伤会出现扩大，数值模拟结果与现场实测结果基本一致。模拟结果为该类公路分岔小净距隧道施工提供一定参考。

Abstract

Clarifying the law of rock damage in the bifurcation small net distance tunnel under the condition of alternating blasting construction will help to better ensure the construction of the tunnel site and the stability of the surrounding rock. The three-dimensional finite difference software FLAC3D simulated the excavation process of the bifurcated small net distance tunnel under the action of blasting load, focused on the damage distribution and evolution of the middle rock under different excavation conditions, and finally verified by the on-site acoustic damage range detection results of the Xiamen Haicang Dredging Channel Bifurcation Tunnel Project. The results show that the stress wave generated by blasting reflects at the fork to form tensile stress, which makes the damage to the fork section more serious; the damage to the sandwich rock in the tunnel is asymmetrically distributed, and the damage from the inside of the middle sandwich rock to the contour line gradually increases, the maximum damage of the middle rock on the main tunnel side is in the range of 90 ° to 120 °, the maximum damage of the middle sandwich rock on the ramp side is within the range of 90 °, and the thickness of the middle sandwich rock has a greater influence on the damage of the middle sandwich rock, and with the increase of the thickness, the degree of damage of the middle between the rock decreases and the damage range does not penetrate the left and right tunnels; Through the simulation to change different approaches, excavation staggered distance and excavation sequence, it is found that compared with 2m, the complete damage area of 5m approach is increased by 58.5%, the damage penetration area is increased by 70%, the complete damage area of the staggered 1 step is increased by 1.27m compared with the staggered 4-step working condition, and the damage penetration range is also increased, and the excavation of a smaller section is conducive to the stability of the middle rock, and the symmetry of the surrounding rock damage is better, but the damage to the rock mass on the side of the middle sandwich rock will be expanded, and the numerical simulation results are basically consistent with the actual measurement results of the site. The simulation results provide certain references for the construction of the small net distance tunnel of the bifurcation of the highway.

导出引用

杨杭澎1，俞缙1，付晓强1,2，姚玮1，林聪波1，常方强1. 交替爆破开挖下分岔隧道中夹岩损伤特征研究[J]. 振动与冲击, 2023, 42(1): 46-53

YANG Hangpeng1, YU Jin1, FU Xiaoqiang1,2, YAO Wei1, LIN Congbo1, CHANG Fangqiang1. Damage characteristics of intercalary rock in bifurcated tunnel under alternate blasting excavation[J]. Journal of Vibration and Shock, 2023, 42(1): 46-53

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