爆炸作用下冻结管振动响应规律研究
投稿时间:2017-10-20  修订日期:2018-05-24  点此下载全文
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作者单位E-mail
种玉配 中铁隧道局集团有限公司勘察设计研究院 815501773@qq.com 
东兆星 中国矿业大学力学与土木工程学院  
齐燕军 中国矿业大学深部岩土力学与地下工程国家重点实验室  
基金项目:国家自然科学资助项目(51504247,51608520)
中文摘要:为了保证井筒冻结基岩段爆破掘进施工不致冻结管发生断裂,冻结井筒安全施工,对爆炸作用下冻结管的振动响应规律进行研究。通过对爆炸应力波的近似简化和坐标变换,获得了纵波在冻结管周围发生散射时冻结管的应力场和位移场的复数形式。通过有限元软件ANSYS/LS-DYNA对不同温度下(-10℃、-15℃、-20℃和-30℃)冻结管对爆炸作用的振动响应规律进行数值模拟研究,以不同时刻下冻结管的压力云图和速度云图,以及冻结管的应力和速度随着温度的变化曲线分析冻结管对爆炸作用的振动响应规律。数值模拟结果表明:随着温度不断降低,冻结管的最大拉应力、最大压应力、径向振动速度和切向振动速度均是不断降低;冻结管的最大拉应力大于最大压应力,径向振动速度大于切向振动速度,因此,将冻结管的最大拉应力和径向振动速度作为井筒冻结基岩段爆破掘进施工的安全控制依据。为现场冻结方案和爆破方案设计与实施提供依据。
中文关键词:冻结管  振动响应  坐标变换  最大拉应力  径向振动速度
 
Study on vibration response law of freezing pipe under blasting
Abstract:In order to ensure that the freezing pipe does not break during blasting and tunneling construction in the freezing bedrock section of the shaft and safety construction of freezing shaft, the vibration response of frozen pipe under explosion is studied. By approximate simplification of explosion stress wave and coordinate transformation, The plural form of stress field and displacement field of the frozen pipe is obtained when the longitudinal wave scatters in the vicinity of the freezing pipe. The numerical simulation of the vibration response of the freezing pipe under different temperatures (-10℃, -15℃, -20℃and-30℃) was carried out by the finite element software ANSYS/LS-DYNA, the vibration response of the freezing pipe to explosion is analyzed by pressure nephogram and velocity nephogram of freezing pipe at different time and curves of stress and velocity of frozen pipe with temperature. The numerical simulation results show that the maximum tensile stress, the maximum compressive stress, the radial vibration velocity and the tangential vibration velocity of the frozen pipe are continuously decreased with the decrease of temperature. The maximum tensile stress of the frozen pipe is greater than the maximum compressive stress, and the radial vibration velocity is greater than the tangential vibration velocity, therefore, the maximum tensile stress and radial vibration velocity of the freezing pipe are taken as the safety control basis for the blasting excavation construction in the freezing bedrock section shaft. The numerical simulation results provide the basis for the design and implementation of blasting scheme and freezing scheme.
keywords:freezing pipe  vibration response  coordinate transformation  maximum tensile stress  radial vibration velocity
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