高铁隧道爆破振动对围岩稳定性影响及控制研究
发布时间：2018-07-25 13:14
【摘要】：近些年来,我国的经济快速增长,城市化的步伐加快,我国的交通事业也得到了蓬勃发展,在一些高原地区受到地形条件的影响,不得不开辟隧道,导致穿过闹市区的浅埋隧道也越来越多。但是这些隧道工程受到地形条件的限制,有很大一部分需采用爆破施工。在埋深较浅的隧道中进行爆破施工,爆破施工质量的好坏对高速铁路隧道围岩的稳定性有很大的影响,爆破振动产生的振动越大使得问题变得愈加突出,从而增加了爆破施工的难度和风险,采取的施工措施稍有不当,产生的爆破振动就有可能引起围岩的失稳、混凝土的开裂或脱落。本文主要是通过监测爆破振动引起的振动效应对围岩稳定性的危害,调整和优化爆破设计参数,准确反馈施工,以确保施工过程中的安全以及围岩的稳定。通过监测数据分析发现,围岩稳定性的破坏不但与振幅有关,还与振动的频率和持续时间有关,并与围岩本身的性质及爆破地震的累积效应有很大的关系。本文结合贵州省贵阳市长昆客运专线小米坡隧道爆破项目,取得的主要成果如下:1、对总体爆破施工方案进行优化,优化的爆破方案用于现场施工试验中,得到相应的爆破施工记录以及相应的爆破振动测试值,对以后施工起到一定的指导作用;2、按照优化前的爆破施工方案施工,爆破振动通过围岩作用于衬砌并造成了损坏,在优化前的方案下所测得爆破振动峰值均偏高,使得近距离的衬砌出现裂隙;方案优化后现场所测得爆破振动峰值均小于1.5m/s,按照此方案施工后未出现明显的裂隙;3、通过对爆破总体方案与爆破设计参数的优化以及现场爆破振动测试数值与波形的整理中,可发现爆破振动的峰值均在控制值之内,且在此控制值内不再出现破坏,因此优化方案是合理的、可行的、对实际工程有指导意义。4、通过对振动仪器的了解与现场实际勘察,对爆破振动测试拟定布置的测线是合理的,振动仪器的选择是科学的。
[Abstract]:In recent years, the economy of our country has grown rapidly, the pace of urbanization has been quickened, and the transportation industry in our country has also developed vigorously. In some highland areas affected by terrain conditions, we have to open tunnels. There are more and more shallow tunnels that lead to the passage through downtown areas. However, these tunnel projects are restricted by topographic conditions, and a large part of them need blasting construction. When blasting construction is carried out in a tunnel with shallow buried depth, the quality of blasting construction has a great influence on the stability of surrounding rock of high-speed railway tunnel. The larger the vibration caused by blasting vibration, the more prominent the problem becomes. Thus, the difficulty and risk of blasting construction are increased, and if the construction measures are slightly improper, the blasting vibration may lead to the instability of surrounding rock and the cracking or falling off of concrete. In this paper, by monitoring the damage of vibration effect caused by blasting vibration to the stability of surrounding rock, adjusting and optimizing the parameters of blasting design and accurately feedback construction, to ensure the safety of construction process and the stability of surrounding rock. Through the analysis of monitoring data, it is found that the failure of surrounding rock stability is related not only to the amplitude, but also to the frequency and duration of vibration, and to the nature of the surrounding rock and the cumulative effect of blasting earthquakes. In this paper, combined with the Xiaomi slope tunnel blasting project of Guiyang Mayor's Kunming passenger dedicated Line, the main results obtained are as follows: 1. The overall blasting construction scheme is optimized, and the optimized blasting scheme is used in the field construction test. According to the blasting construction plan before optimization, the blasting vibration acts on the lining through the surrounding rock and causes damage, and the corresponding blasting construction record and the corresponding blasting vibration test value are obtained, which will play a certain guiding role in the construction in the future, according to the blasting construction plan before the optimization, the blasting vibration acts on the lining through the surrounding rock and causes damage. The peak values of blasting vibration measured before optimization are all on the high side, resulting in cracks in the short distance lining. After optimization, the peak values of blasting vibration are less than 1.5 m / s, according to this scheme, there is no obvious crack after construction. Through the optimization of blasting overall plan and blasting design parameters, as well as the consolidation of field blasting vibration test value and waveform, It can be found that the peak value of blasting vibration is within the control value, and there is no damage in the control value, so the optimization scheme is reasonable and feasible, and has guiding significance for practical engineering. It is reasonable to draw up the measuring line for blasting vibration test, and the choice of vibration instrument is scientific.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD235
本文编号：2143932
[Abstract]:In recent years, the economy of our country has grown rapidly, the pace of urbanization has been quickened, and the transportation industry in our country has also developed vigorously. In some highland areas affected by terrain conditions, we have to open tunnels. There are more and more shallow tunnels that lead to the passage through downtown areas. However, these tunnel projects are restricted by topographic conditions, and a large part of them need blasting construction. When blasting construction is carried out in a tunnel with shallow buried depth, the quality of blasting construction has a great influence on the stability of surrounding rock of high-speed railway tunnel. The larger the vibration caused by blasting vibration, the more prominent the problem becomes. Thus, the difficulty and risk of blasting construction are increased, and if the construction measures are slightly improper, the blasting vibration may lead to the instability of surrounding rock and the cracking or falling off of concrete. In this paper, by monitoring the damage of vibration effect caused by blasting vibration to the stability of surrounding rock, adjusting and optimizing the parameters of blasting design and accurately feedback construction, to ensure the safety of construction process and the stability of surrounding rock. Through the analysis of monitoring data, it is found that the failure of surrounding rock stability is related not only to the amplitude, but also to the frequency and duration of vibration, and to the nature of the surrounding rock and the cumulative effect of blasting earthquakes. In this paper, combined with the Xiaomi slope tunnel blasting project of Guiyang Mayor's Kunming passenger dedicated Line, the main results obtained are as follows: 1. The overall blasting construction scheme is optimized, and the optimized blasting scheme is used in the field construction test. According to the blasting construction plan before optimization, the blasting vibration acts on the lining through the surrounding rock and causes damage, and the corresponding blasting construction record and the corresponding blasting vibration test value are obtained, which will play a certain guiding role in the construction in the future, according to the blasting construction plan before the optimization, the blasting vibration acts on the lining through the surrounding rock and causes damage. The peak values of blasting vibration measured before optimization are all on the high side, resulting in cracks in the short distance lining. After optimization, the peak values of blasting vibration are less than 1.5 m / s, according to this scheme, there is no obvious crack after construction. Through the optimization of blasting overall plan and blasting design parameters, as well as the consolidation of field blasting vibration test value and waveform, It can be found that the peak value of blasting vibration is within the control value, and there is no damage in the control value, so the optimization scheme is reasonable and feasible, and has guiding significance for practical engineering. It is reasonable to draw up the measuring line for blasting vibration test, and the choice of vibration instrument is scientific.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD235
【参考文献】
相关期刊论文 前2条
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2 谭忠盛,杨小林,王梦恕;复线隧道施工爆破对既有隧道的影响分析[J];岩石力学与工程学报;2003年02期
，本文编号：2143932
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