爆破振动对邻近埋地管道安全影响的测试与分析

发布时间：2018-03-10 18:00

本文选题：桥梁桩井　切入点：爆破施工　出处：《西南科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文以荣乌高速红泉村3#大桥桩井爆破施工工程为背景,综合理论分析、现场测试、数值模拟和模型试验研究了桥梁桩井爆破振动的传播规律以及管道对爆破振动的动力响应规律,探讨了邻近埋地管道桩井爆破施工振动的控制标准。主要开展了如下几方面的研究工作:(1)通过现场振动测试研究了桩井爆破引起邻近埋地管道正上方地表振动规律;结果表明测点与爆源距离11.2m的区域,径向振速最大;测点与爆源距离为11.2m~26.3m的区域,垂向振速最大;测点与爆源距离26.3m的区域,切向振速最大。工程实际中,应按照此规律对应不同区域位置,对不同方向的振速进行重点监测和防护控制。(2)针对现场测试提出了开展预实验、调整爆破参数以及加强施工管理等措施控制爆破振动对邻近埋地管道的安全影响,并提出了长期振动监测规范化管理的技术措施。(3)结合现场振动测试开展数值模拟,分析了管道正上方地表土体的振动速度与管道动应力的对应关系。数值计算结果表明埋地管道迎爆面最容易受爆破振动影响而发生破坏。对应地表峰值振速管道上的最大动应力为4.22Mpa,仅为管道屈服强度的1.02%,工程实际中将地表振动速度3.0cm/s作为埋地管道安全的振动控制标准偏保守。(4)开展模型试验,将试验结果与现场测试、数值模拟结果进行对比分析,研究了邻近埋地管道爆破振动的传播规律;分析了埋地管道对爆破振动的加速度和应变响应规律。本课题研究成果对于管道工程抗爆防爆设计,以及邻近埋地管道爆破施工工程的科学决策具有重要的参考价值。
[Abstract]:In this paper, based on the blasting construction project of Rong-Wu High-speed Hongquan Village Bridge, comprehensive theoretical analysis and field test are carried out. The propagation law of blasting vibration of bridge pile well and the dynamic response of pipeline to blasting vibration are studied by numerical simulation and model test. This paper discusses the control standard of blasting vibration of pile well in adjacent buried pipeline. The main research work is as follows: 1) through field vibration test, the vibration law of ground surface caused by pile well blasting is studied directly above the adjacent buried pipeline. The results show that the radial vibration velocity is the largest in the area where the distance between the measuring point and the detonation source is 11.2m, the vertical vibration velocity is the largest in the area where the distance between the measuring point and the detonation source is 11.2mand 26.3m, and the tangential vibration velocity is the largest in the area with the measuring point and detonation source distance of 26.3 m. According to this rule, the vibration velocities in different directions should be monitored and protected according to this law. Measures such as adjusting blasting parameters and strengthening construction management are used to control the impact of blasting vibration on the safety of nearby buried pipelines, and the technical measures of long-term vibration monitoring and standardized management are put forward. The numerical simulation is carried out in combination with field vibration test. The relationship between the vibration velocity of soil and the dynamic stress of pipeline is analyzed. The numerical results show that the surface of buried pipeline is most vulnerable to blasting vibration. The maximum dynamic stress on the surface is 4.22Mpa, which is only 1.02 of the pipeline yield strength. In engineering practice, the surface vibration velocity (3.0 cm / s) is regarded as the conservative vibration control standard for buried pipeline safety, and the model test is carried out. The experimental results are compared with the results of field test and numerical simulation, and the propagation law of blasting vibration of nearby buried pipeline is studied. The laws of acceleration and strain response of buried pipeline to blasting vibration are analyzed. The research results of this subject have important reference value for the design of anti-explosion and anti-explosion of pipeline engineering and the scientific decision of blasting construction engineering in adjacent buried pipeline.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE973;U445.53

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