Blasting seismic effect of buried cast iron pipeline in silty clay layer

doi:10.3785/j.issn.1008-973X.2021.03.010

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (3): 500-510 DOI: 10.3785/j.issn.1008-973X.2021.03.010

Blasting seismic effect of buried cast iron pipeline in silty clay layer

Bin ZHU1(

),Nan JIANG1,2,*(

),Chuan-bo ZHOU1,Yong-sheng JIA2,3,Xue-dong LUO1,Ting-yao WU1

1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
2. Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430024, China
3. Wuhan Explosion and Blasting Co. Ltd, Wuhan 430024, China

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Abstract

A full-scale blasting experiment of adjacent pre-buried pipes was designed and implemented, aiming at the common direct-buried ductile iron pipes in the urban area of Wuhan. Combined with the finite element numerical calculation method and considering the different buried depth of the pipeline, the dynamic response of the directly buried pipeline in the silty clay layer under the action of the blasting vibration was studied. Results show that the pipeline and the surface peak particle velocities (PPVs) increase with the decrease of the blast distance, and the most dangerous working condition is blasting directly below the pipeline. The central section of the pipeline is dangerous. The PPVs at the waist and bottom of the tube are larger for the dangerous section. The dynamic strain is mainly the axial tensile strain and the hoop strain is smaller. The peak effective stress in the bottom element is the largest and that of the pipe shoulder is the smallest. There is a functional relationship between PPVS and different embedded depth of pipeline. By measuring the relationship between the surface PPVs and the peak effective stress, the peak effective stress of the pipeline section can be predicted, which provides a calculation method for the safety determination of related pipelines in engineering construction.

Key words： directly buried pipeline blasting seismic effect particle velocities peak effective stress safety evaluation

Received: 15 February 2020 Published: 25 April 2021

CLC:

TU 990.3

Fund: 国家自然科学基金资助项目（41807265，41972286）；爆破工程湖北省重点实验室开放基金资助项目（HKLBEF202001）；湖北省自然科学基金资助项目（2019CFB224）

Corresponding Authors: Nan JIANG E-mail: b.zhu@cug.edu.cn;jiangnan@cug.edu.cn

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Cite this article:

Bin ZHU,Nan JIANG,Chuan-bo ZHOU,Yong-sheng JIA,Xue-dong LUO,Ting-yao WU. Blasting seismic effect of buried cast iron pipeline in silty clay layer. Journal of ZheJiang University (Engineering Science), 2021, 55(3): 500-510.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.03.010 OR http://www.zjujournals.com/eng/Y2021/V55/I3/500

粉质黏土层直埋铸铁管道爆破地震效应

针对武汉市区内常见直埋球墨铸铁管道，设计实施邻近预埋管道的全尺寸爆破实验. 结合有限元数值计算方法，考虑管道不同埋深，研究爆破地震作用下粉质黏土地层内直埋管道动力响应. 研究结果表明，管道和地表峰值振速（PPVs）随爆源与管道距离的减小而增大，在管道正下方爆破为最危险工况. 管道中心截面为危险截面，危险截面PPVs以管腰和管底较大，动态应变以轴向拉伸应变为主，环向应变次之，峰值有效应力以底部单元最大，管道肩部最小. 管道不同埋置深度和PPVs具有比例关系，通过实测地表振速与管道有效应力关系可以预测管道截面爆破峰值有效应力，计算关系式可以为岩土爆破施工中邻近管道的安全性评价提供计算方法.

关键词： 直埋管道, 爆破地震, 质点速度, 峰值有效应力, 安全评价

Tab.1 Rock and soil parameters of blasting site

Fig.1 Schematic diagram of field experiment design

Tab.2 Ductile iron pipe parameters for experiment

Fig.2 Arrangement diagram of experimental monitoring point

Fig.3 Field experiment implementation diagram

Fig.4 Numerical model of field blasting experiment

Tab.3 Numerical simulation parameter of blasting experiment

Tab.4 Detonation product parameter

Fig.5 Diagram of numerical measurement points for blasting experiments

Fig.6 Experimental and numerical simulation of vibration waveform of mass at bottom of pipe

Fig.7 Experimental and numerical simulation of vibration frequency of mass at bottom of pipe

Fig.8 Vibration velocity in axial direction of pipeline

Fig.9 Schematic diagram of pipe section unit

Fig.10 Simulation results of pipe section velocity distribution

Fig.11 Measured pipe section strain distribution

Fig.12 Effective stress distribution of pipeline

Fig.13 Effective stress distribution of section

Fig.14 Relationship between pipe and surface vibration velocity

Fig.15 Relationship between effective stress and vibration speed

Tab.5 Vibration velocity with different pipeline buried depth

Fig.16 Relationship between pipeline and ground surface vibration velocity ratio and buried depth


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