隧道爆破地震作用下燃气管道动力响应规律研究  

Study on Dynamic Response Law of Gas Pipeline under Tunnel Blasting Seismic Waves

作　　者：王梓宇 李胜林[2] 李黎 凌天龙 梁书锋[2] 孙旭 WANG Zi-yu;LI Sheng-lin;LI Li;LING Tian-long;LIANG Shu-feng;SUN Xu(Beijing Urban Express Rail Construction Management Co.,Ltd.,Beijing 100027,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;Beijing Uni-Construction Group Co.,Ltd.,Beijing 100029,China;College of Mechanical and Architectural Engineering,Taishan University,Tai′an 271000,China)

机构地区：[1]北京城市快轨建设管理有限公司,北京100027 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]北京住总集团有限责任公司,北京100029 [4]泰山学院机械与建筑工程学院,泰安271000

出　　处：《爆破》2024年第3期212-221,247,共11页Blasting

基　　金：山东省自然科学基金(ZR2020QE266)。

摘　　要：以北京地铁11号线金顶街站C出入口横通道爆破工程为背景,采用有限元软件LS-DYNA对邻近燃气管道及地表土体的爆破动力响应进行计算分析,结合管道及上方地表振动速度监测结果,验证了数值模型的有效性。在此基础上,建立隧道下穿燃气管道数值模型,分析不同掏槽孔延期时间、单孔药量、土体性质对管道振动特征和动应力分布的影响。研究结果表明:数值模型与现场实测结果相比,峰值振速的相对误差未超过20%;在爆破地震波影响下,燃气管道横截面的峰值合振速(peak particle velocity,PPV)和有效应力峰值均出现在背爆侧;在燃气管道轴线方向上,当距离隧道中心的水平距离超过3 m时,地表土体与管道顶部振动速度存在明显的线性关系;掏槽孔孔间延期时间增加时,燃气管道横截面各点的峰值合振速和有效应力变化不大;单孔药量由0.2 kg增大至0.6 kg,峰值合振速增大0.5~2.5倍,有效应力增大0.5~1.5倍。燃气管线周围土体为粉质黏土时对峰值合振速和有效应力的影响最大,黏质粉土其次,杂填土最小。The blasting dynamic response of the gas pipeline and surrounding soil during the excavation of the cross passage at the entrance and exit C of Jinding Street Station of Beijing Metro Line 11 was analyzed using the finite software LS-DYNA.The numerical model′s accuracy was confirmed by comparing it with blast-induced vibration data from on-site surveys.The study focused on the dynamic response of the buried gas pipeline to tunnel blasting,considering factors such as different cutting hole delay times,single hole charge,and soil properties.The results indicated that the peak particle velocity(PPV)from the numerical model was within 20%of the field test data.The PPV and peak effective stress(PES)of the pipeline were highest at the side back of the explosion source.A linear relationship between PPV values of the surface soil and the pipeline was observed when the horizontal distance from the tunnel center exceeded 3m in the axial direction of the gas pipeline.The PPVs and PESs on the cross-section of the gas pipeline did not change significantly with increasing delay times between cutting holes.Furthermore,increasing the charge of the cutting hole from 0.2 kg to 0.6 kg led to an increase of 0.5~2.5 times in PPVs and 0.5~1.5 times in PESs.The soil type around the gas pipeline also influenced the peak combined vibration velocity and effective stress,with silty clay having the greatest impact,followed by clayey silt,and then miscellaneous soil.

关 键 词：隧道工程 爆破振动 燃气管道 振动响应 数值模拟 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]