本文選題：橋梁樁井　切入點：爆破施工　出處：《西南科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文以榮烏高速紅泉村3#大橋樁井爆破施工工程為背景,綜合理論分析、現(xiàn)場測試、數(shù)值模擬和模型試驗研究了橋梁樁井爆破振動的傳播規(guī)律以及管道對爆破振動的動力響應(yīng)規(guī)律,探討了鄰近埋地管道樁井爆破施工振動的控制標(biāo)準(zhǔn)。主要開展了如下幾方面的研究工作:(1)通過現(xiàn)場振動測試研究了樁井爆破引起鄰近埋地管道正上方地表振動規(guī)律;結(jié)果表明測點與爆源距離11.2m的區(qū)域,徑向振速最大;測點與爆源距離為11.2m~26.3m的區(qū)域,垂向振速最大;測點與爆源距離26.3m的區(qū)域,切向振速最大。工程實際中,應(yīng)按照此規(guī)律對應(yīng)不同區(qū)域位置,對不同方向的振速進(jìn)行重點監(jiān)測和防護(hù)控制。(2)針對現(xiàn)場測試提出了開展預(yù)實驗、調(diào)整爆破參數(shù)以及加強(qiáng)施工管理等措施控制爆破振動對鄰近埋地管道的安全影響,并提出了長期振動監(jiān)測規(guī)范化管理的技術(shù)措施。(3)結(jié)合現(xiàn)場振動測試開展數(shù)值模擬,分析了管道正上方地表土體的振動速度與管道動應(yīng)力的對應(yīng)關(guān)系。數(shù)值計算結(jié)果表明埋地管道迎爆面最容易受爆破振動影響而發(fā)生破壞。對應(yīng)地表峰值振速管道上的最大動應(yīng)力為4.22Mpa,僅為管道屈服強(qiáng)度的1.02%,工程實際中將地表振動速度3.0cm/s作為埋地管道安全的振動控制標(biāo)準(zhǔn)偏保守。(4)開展模型試驗,將試驗結(jié)果與現(xiàn)場測試、數(shù)值模擬結(jié)果進(jìn)行對比分析,研究了鄰近埋地管道爆破振動的傳播規(guī)律;分析了埋地管道對爆破振動的加速度和應(yīng)變響應(yīng)規(guī)律。本課題研究成果對于管道工程抗爆防爆設(shè)計,以及鄰近埋地管道爆破施工工程的科學(xué)決策具有重要的參考價值。
[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.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE973;U445.53

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