爆破振动下城市管架型热力管道响应与安全研究  

Study on the Dynamic Response of Heating Power Pipe Under Blasting Vibration

作　　者：李胜林[1] 李黎 龙彬 韩丽茹 侯宗新 尹萌 LI Shenglin;LI Li;LONG Bin;HAN Liru;HOU Zongxin;YIN Meng(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Beijing Zhuzong Group Company Limited,Beijing 100029,China;China Railway 16th Bureau Group Corporation Limited,Beijing 101500,China;Water Affairs Bureau of Mengcun Hui Autonomous County,Cangzhou,Hebei 061400,China;China National Heavy Duty Truck Group Jinan Power Company Limited,Jinan,Shandong 250000,China)

机构地区：[1]中国矿业大学(北京)力学与土木工程学院,北京100083 [2]北京住总集团有限责任公司,北京100029 [3]中铁十六局集团路桥工程有限公司,北京101500 [4]孟村回族自治县水务局,河北沧州061400 [5]中国重汽集团济南动力有限公司,山东济南250000

出　　处：《北京理工大学学报》2024年第9期895-903,共9页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(51574247,10272109);山东省自然科学基金(ZR2020QE266);中国矿业大学(北京)大学生创新训练项目(202306008)。

摘　　要：以下穿热力隧道的北京冬奥支线区间隧道爆破为背景,建立热力管道三维动力有限元模型,利用锤击测试试验验证了数值模型的可靠性.在数值模型中输入实测的爆破振动波,研究爆破地震波作用下管架型热力管道动态响应.结果表明:爆破地震波作用下,管道结构的有效应力为45.89 MPa,有效应变仅为0.02%,与重力初始作用时结构应力应变分布保持一致,爆破振动对管道结构的作用效应较小;放大输入地震波5~100倍,管道结构的PPV随之等倍数增大,而最大等效应力和最大等效应变的增幅仅为4.5%左右;提取实测地震波低频成分并施加在管道结构上,并不会引起热力管道的应力和应变大幅度增加,管道材料的等效应力均在50 MPa以下.由此可见,地震波峰值和主频对管道应力应变分布影响均较小。具有波纹管膨胀节的架空管道结构受力均匀,变形协调性和抗震性能较好,因工程爆破振动造成破坏的可能性不大.A three-dimensional dynamic finite element model of the heat pipe is established in the context of the tunnel blasting of the Beijing Winter Olympics branch line interval that passes under the heat tunnel.The reliability of the numerical model is verified by the hammering test,and on this basis,the measured blast vibration wave is input to study the dynamic response law of the pipe rack-type thermal pipeline subjected to the blast seismic wave.The results show that:when the actual blasting vibration acts on the pipeline,the maximum Mises stress of the pipeline structure is 45.82 MPa,and the maximum effective strain is only 0.02%,which is consistent with the distribution of structural stress and strain when there is only the initial action of gravity,which indicates that the blast actual vibration on the pipeline structure is relatively small;amplifying the input blasting vibration by a factor of 5−100,the PPV of the pipeline structure increases proportionally,and the increases of the maximum Mises stress and the effective strain is only about 4.5%.The low-frequency component of the seismic wave is extracted from the measured seismic wave and applied to the pipeline structure.However,the low-frequency vibration does not cause the resonance response of the thermal pipeline's stress and strain,and the Mises stresses of the pipeline material are all below 50MPa,It can be seen that the peak and main frequency of seismic waves have little influence on the stress-strain distribution of the pipeline.The overhead pipeline structure with bellows expansion joint has uniform force,good deformation coordination and seismic performance,and is less likely to be damaged by engineering blasting vibration.

关 键 词：隧道爆破 热力管道 动力响应 应力状态 

分 类 号：TU375[建筑科学—结构工程]