本文選題：爆破振動 + 輸油管線　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：在隧道開挖掘進(jìn)過程中,鉆爆法是主要采用的施工方法之一。當(dāng)城市近郊隧道工程采用鉆爆法施工時,常常遇到爆破振動對于周邊管線的影響問題。而管線作為特殊構(gòu)筑物一旦因振動影響發(fā)生破壞會造成巨大的經(jīng)濟(jì)損失和社會影響。因此,研究爆破振動對于近距管線的影響規(guī)律,具有重要的理論和現(xiàn)實意義。本文運(yùn)用應(yīng)力波基本理論分析了應(yīng)力波在介質(zhì)中的傳播與衰減以及在介質(zhì)交界面處的反射、折射規(guī)律,并運(yùn)用有限元模擬軟件ANSYS/LS-DYNA,模擬了在爆炸作用下,不同炸藥類型、不同單段最大起爆藥量、不同管線與爆源距離、不同管線直徑、不同管線壁厚以及不同管線埋深條件下管線的受爆破振動影響情況,得出:管線迎爆面中心質(zhì)點(diǎn)的Y向振速最大;管線峰值振速隨單段最大起爆藥量的增加而增加,隨管線與爆源間距離增加而減小,隨管線直徑的增加而增加,隨管線壁厚的增加而增加,隨管線埋深的增加而減小;管線沿地震波傳播方向上振速大于垂直于地震波傳播方向上振速,管線的存在對于沿地震波傳播方向上的振速影響小于垂直于地震波縱波傳播方向上的振速;同時,管線周圍近距巖石最大振速因管線存在發(fā)生一定變化,巖石最大振速隨與管線間距離增大而減小;根據(jù)理論分析與數(shù)值模擬研究結(jié)果,提出了隧道爆破施工時管線的相關(guān)保護(hù)措施。
[Abstract]:Drilling and blasting method is one of the main construction methods in tunnel excavation. When urban suburban tunnel works are constructed by drilling and blasting method, the influence of blasting vibration on the surrounding pipelines is often encountered. As a special structure, once the pipeline is damaged by vibration, it will cause huge economic loss and social impact. Therefore, it is of great theoretical and practical significance to study the influence of blasting vibration on short distance pipeline. In this paper, the basic theory of stress wave is used to analyze the propagation and attenuation of stress wave in the medium, as well as the law of reflection and refraction at the interface of the medium. The finite element simulation software ANSYS- LS-DYNA is used to simulate the different types of explosives under the action of explosion. Under different conditions, such as maximum detonation charge, distance between pipeline and detonation source, diameter of pipeline, wall thickness of pipeline and buried depth of pipeline, the vibration of pipeline is affected by blasting vibration. It is concluded that the Y-direction vibration velocity of the center particle of the pipeline faces the explosion is the largest, the peak vibration velocity of the pipeline increases with the increase of the maximum initial explosive quantity in a single section, decreases with the increase of the distance between the pipeline and the detonation source, and increases with the increase of the diameter of the pipeline. With the increase of the wall thickness of the pipeline and the decrease of the buried depth of the pipeline, the upward vibration velocity of the pipeline along the direction of seismic wave propagation is greater than that of the vertical direction of the seismic wave propagation. The influence of pipeline on the vibration velocity along the direction of seismic wave propagation is less than that perpendicular to the direction of longitudinal wave propagation of seismic wave, at the same time, the maximum vibration velocity of the near distance rock around the pipeline changes to some extent due to the existence of pipeline. The maximum vibration velocity of rock decreases with the increase of the distance between the pipeline and the pipeline. Based on the theoretical analysis and numerical simulation results, the protective measures for the pipeline in tunnel blasting construction are put forward.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE973

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本文編號：2098629