爆破振动作用下邻近埋地混凝土管道动力响应特性

发布时间：2018-01-06 10:27

本文关键词：爆破振动作用下邻近埋地混凝土管道动力响应特性　出处：《哈尔滨工业大学学报》2017年09期 　论文类型：期刊论文

【摘要】：为保证埋地混凝土管道在爆破施工过程的安全性,采用现场监测和动力有限元数值模拟相结合的研究方法,对超浅埋地铁站通道爆破开挖邻近埋地混凝土管道的动力响应进行研究.通过建立管道拉应力峰值和振动速度峰值的函数关系,由最大拉应力强度理论得到管道的爆破控制振速.由管道不同断面最大振速与对应位置管道正上方地表振速之间关系,提出保证管道安全的地表爆破控制振速.结果表明:空管状态下,掌子面后方,管道断面底部和中部振速较为接近,顶部振速最小;掌子面前方,管道断面质点振速呈现出底部最大、中部次之、顶部最小的振动特征;沿着管道轴线方向,质点振速最大的位置出现在掌子面前方3 m管道断面底部位置.管道在空管和满水两种状态下质点振动特征基本一致,管道中水的存在能降低管道质点振速,最大降低幅度为7.3%.管道的爆破控制振速为10.84 cm/s,保证管道安全的地表爆破控制振速为4.53 cm/s.确定的爆破控制振速可以指导现场爆破施工.
[Abstract]:In order to ensure the safety of blasting in underground concrete pipe construction process, adopting the research method of field monitoring and finite element numerical simulation on the dynamic combination of ultra shallow buried concrete pipe near the excavation of the subway station blasting channel responses are studied. By establishing the pipeline stress function between peak stress and vibration velocity, the maximum pull the pipe should be controlled blasting vibration velocity strength theory. The pipeline is above the maximum vibration velocity in different sections and the corresponding position of the pipeline surface vibration velocity, blasting vibration velocity control surface is proposed to guarantee the safety of the pipeline. The results show that the empty state, behind the face, the pipeline section at the bottom and middle velocity is close to. At the top of the minimum velocity; in front of the face, the pipeline section presents the maximum particle velocity at the bottom, Nakabe Jinno, top of the vibration characteristics of the smallest; along the pipe axis direction of the particle. The position of the maximum velocity appears in front of the tunnel face 3 m pipe section bottom position. The particle in the pipe and the water pipe with two kinds of state vibration characteristics are basically the same, the presence of water in the pipeline pipeline can reduce the particle velocity, the maximum reductions of 7.3%. pipeline control blasting vibration velocity is 10.84 cm/s, ensure the surface blasting vibration control pipeline safety speed for guiding the blasting blasting vibration control, 4.53 cm/s. speed can be determined.

【作者单位】：中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金(41372312,51379194) 黄鹤英才(科技)计划项目(2015055003) 中国博士后科学基金特别资助(2015T80854)
【分类号】：TU94;TU990.3
【正文快照】： 城市地下管道错综复杂,地下工程爆破施工难免会穿越管网区域,当邻近埋地管道进行工程爆破时,爆破振动可能会影响管道的安全[1-3],因此研究爆破振动荷载下埋地管道的动力响应、确定管道的振动速度安全阈值以及确定地表振动控制速度对指导现场爆破施工有着重要的意义.爆破振动对

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