基于全时程爆破荷载的浅埋偏压隧道地表隔振研究  

Research on Surface Vibration Isolation of Shallow-Buried and Eccentrically-Loaded Tunnels Under Full-Time Blasting Loads

作　　者：张帅龙 ZHANG Shuailong(China Railway 15th Bureau Group Co.Ltd.,Shanghai 200070,China)

机构地区：[1]中铁十五局集团有限公司,上海200070

出　　处：《铁道建筑技术》2025年第4期166-170,共5页Railway Construction Technology

基　　金：国家重点研发计划项目(2023YFC3707804);中国铁建股份有限公司科技重大专项(2023-A02)。

摘　　要：浅埋偏压隧道爆破常导致地表邻近构筑物发生结构失稳破坏。以某浅埋偏压铁路隧道为例,采用全时程等效爆破荷载模拟法,利用有限差分软件FLAC~(3D)研究不同隔振墙深度与宽度条件下,隧道爆破应力传播与衰减规律及地表振动响应问题,并与现场监测数据进行对比分析。结果表明,采用全时程等效爆破荷载法模拟爆破作用可以有效反映中远距离的振动响应,模拟结果与实测振动加速度结果吻合度较高,验证了全时程等效荷载爆破模拟方式的可行性和正确性;爆破应力波主要在浅层软弱土层中传播,隔振墙深度与宽度的变化对地表震动峰值加速度、振动加速度级产生影响;随着隔振墙深度与宽度的增加,隔振装置后方的地表震动峰值加速度与振动加速度级显著减小,而其隔振率与插入损失随之增加。The blasting operations of shallow-buried and eccentrically-loaded tunnels often lead to the structural instability and damage of adjacent surface structures.Taking a certain shallow-buried and eccentrically-loaded railway tunnel as an example,this paper adopts the simulation method of full-time equivalent blasting load.By using the finite-difference software FLAC~(3D),it studies issues such as the propagation and attenuation laws of tunnel blasting stress and the surface vibration response under different depths and widths of the vibration-isolation wall,and makes a comparative analysis with the on-site monitoring data.The research results show that the simulation of blasting effects using the full-time equivalent blasting load can effectively reflect the vibration response at medium and long distances from the epicenter.The simulation results are in high agreement with the measured vibration acceleration results,verifying the feasibility and correctness of the full-time equivalent load blasting simulation method.The blasting stress wave mainly propagates in the shallow soft soil layer.The changes in the depth and width of the vibration-isolation wall affect the peak ground vibration acceleration and the vibration acceleration level.With the increase of the depth and width of the vibration-isolation wall,the peak ground vibration acceleration and the vibration acceleration level behind the vibration-isolation device decrease significantly,while its vibration-isolation rate and insertion loss also increase.

关 键 词：浅埋偏压隧道 爆破振动 等效荷载 隔振率 插入损失 数值分析 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]