轻轨隧道爆破引起的古建筑群地震效应及其控制
发布时间：2018-11-10 11:06
【摘要】：城市现代化发展导致的交通问题越来越突出,轻轨铁路的出现有效的减缓了交通压力,与此同时,轻轨铁路的建设过程中的爆破振动对周边建筑物造成的影响也越来越被重视。国内外相关学者与专家已经进行了大量爆破地震对建筑物影响及其控制研究,然而针对古建筑这一特殊结构和类型的建筑物,开展爆破振动影响下的结构振动特性及其爆破地震效应控制研究尚较少。因此,研究爆破振动影响下的古建筑的结构振动特性及其地震效应控制,在工程振动影响下的古建筑保护方面具有十分重要理论研究价值与工程实践指导意义。论文依托育王岭隧道爆破振动安全监测工程,围绕阿育王寺古建筑爆破振动影响及其控制,通过理论分析、现场试验等研究方法,进行了轻轨隧道爆破施工影响下的古建筑结构振动以及爆破地震控制研究,得到了以下一些研究结论与结果:1.开展了依托工程爆破振动观测测试与分析,得到了宁波地区轻轨隧道爆破地震波传播和衰减规律。通过观测结果回归分析,得到了较近距离地表、较远距离铁路路基以及建筑物基础垂直方向、水平径向、水平切向的质点振动速度峰值随炸药药量与距离衰减的经验公式。2.通过爆破地震波时频特性分析、远近距离对比分析指出,振动速度峰值随药量与距离的衰减以水平方向快于垂直方向;相较早时期的质点振动速度峰值随比例药量衰减关系,明显存在衰减指数?的上升趋势,即较远距离条件时爆破振动相对近距离时衰减加快;主振频率主要分布范围为10~70Hz,且以10~20Hz频次最高。3.建立了相应的有限元数值分析模型,开展了砖石塔、山门以及天王殿三类古建筑动力响应与结构振型理论与数值分析,得到了各阶固有频率,结果表明一阶固有频率相拟合,二种分析的二阶与三阶固有频率存在差别。同时三类古建筑的最大振动速度响应值(强夯条件)均远大于工业振动振源条件下的国家重点文物建筑的允许值,说明考虑循环往复持续振动长期作用的时,爆破地震可能会相应古建筑物产生疲劳破坏,因此考虑爆破地震累积效应时,质点振动速度判据标准值宜慎取小值。4.砖石塔和山门以及天王殿二重檐结构动力响应与振型分析结果表明,砖石塔和天王殿固有频率一般在1~10Hz范围内,山门的二、三阶固有频率有增高的趋势,爆破振动随主振频率与古建筑结构的固有频率存在重叠可能,势必导致结构共振进而促使动力响应放大,说明爆破振动安全判据综合考虑振动速度和主振频率的科学合理性。6.针对依托工程现场实际情况,分析提出了轻轨隧道爆破地震控制技术与方法:炸药种类的选择、合理的爆破方式与方法、合理利用地形与地质条件、安全距离的控制、区别对待建筑物类型与类别。
[Abstract]:The traffic problems caused by the development of urban modernization are more and more prominent. The emergence of light rail railway effectively alleviates the traffic pressure. At the same time, the impact of blasting vibration on the surrounding buildings is paid more and more attention to. Scholars and experts at home and abroad have done a lot of research on the impact of blasting earthquakes on buildings and their control. However, in view of the ancient buildings, this special structure and type of buildings, There are few researches on the vibration characteristics of structure and the control of blasting seismic effect under the influence of blasting vibration. Therefore, the study of structural vibration characteristics and seismic effect control of ancient buildings under the influence of blasting vibration has very important theoretical research value and engineering practice guiding significance in the protection of ancient buildings under the influence of engineering vibration. Based on the safety monitoring project of blasting vibration in Yuwangling Tunnel, the paper focuses on the influence and control of blasting vibration in ancient buildings of Ashowangsi, through theoretical analysis, field test and other research methods. The vibration of ancient building structure and blasting seismic control under the influence of blasting construction of light rail tunnel are studied. Some conclusions and results are obtained as follows: 1. The propagation and attenuation of blasting seismic wave in light rail tunnel in Ningbo area are obtained by means of blasting vibration observation and analysis based on engineering. By regression analysis of observation results, the empirical formulas of the peak vibration velocity of particle vibration in the vertical direction, horizontal radial direction and horizontal tangential direction of the near surface, long-distance railway subgrade and building foundation are obtained. 2. By analyzing the time-frequency characteristics of blasting seismic waves and comparing the distance between far and short, it is pointed out that the peak value of vibration velocity decreases faster in the horizontal direction than in the vertical direction with the decrease of the charge quantity and distance. In the earlier period, the peak value of particle vibration velocity attenuated with proportional charge, and the attenuation exponent was obvious. The main frequency distribution range of the main vibration is 1070 Hz, and the 10~20Hz frequency is the highest. The corresponding finite element numerical analysis model is established and the theory and numerical analysis of dynamic response and structural mode of three ancient buildings, brick tower, mountain gate and Tianwangdian are carried out, and the natural frequencies of each order are obtained. The results show that the first-order natural frequencies fit together. The second order and third order natural frequencies of the two kinds of analysis are different. At the same time, the maximum vibration velocity response value (dynamic compaction condition) of the three kinds of ancient buildings is much larger than the allowable value of the state key cultural relic buildings under the condition of industrial vibration source, which shows that the long-term effect of cyclic and continuous vibration is considered. Blasting earthquake may cause fatigue damage to ancient buildings. Therefore, when considering the cumulative effect of blasting earthquake, the standard value of particle vibration velocity criterion should be carefully taken into account. 4. 4. The results of dynamic response and vibration analysis of brick tower, mountain gate and double eaves of Tianwang Temple show that the natural frequencies of brick tower and Tianwang Hall are generally within the range of 1~10Hz, and the second and third natural frequencies of the gate have a tendency to increase. The blasting vibration may overlap with the natural frequency of the ancient building structure with the main vibration frequency, which will inevitably lead to the structural resonance and promote the dynamic response amplification. It is shown that the safety criterion of blasting vibration is scientific and reasonable considering the vibration speed and the main vibration frequency. 6. According to the actual situation of the project, this paper analyzes and puts forward the blasting seismic control technology and method of light rail tunnel: the choice of explosive type, the reasonable blasting method and method, the reasonable use of terrain and geological conditions, and the control of safe distance. Distinguish between types and categories of buildings.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.6;TU311.3
本文编号：2322297
[Abstract]:The traffic problems caused by the development of urban modernization are more and more prominent. The emergence of light rail railway effectively alleviates the traffic pressure. At the same time, the impact of blasting vibration on the surrounding buildings is paid more and more attention to. Scholars and experts at home and abroad have done a lot of research on the impact of blasting earthquakes on buildings and their control. However, in view of the ancient buildings, this special structure and type of buildings, There are few researches on the vibration characteristics of structure and the control of blasting seismic effect under the influence of blasting vibration. Therefore, the study of structural vibration characteristics and seismic effect control of ancient buildings under the influence of blasting vibration has very important theoretical research value and engineering practice guiding significance in the protection of ancient buildings under the influence of engineering vibration. Based on the safety monitoring project of blasting vibration in Yuwangling Tunnel, the paper focuses on the influence and control of blasting vibration in ancient buildings of Ashowangsi, through theoretical analysis, field test and other research methods. The vibration of ancient building structure and blasting seismic control under the influence of blasting construction of light rail tunnel are studied. Some conclusions and results are obtained as follows: 1. The propagation and attenuation of blasting seismic wave in light rail tunnel in Ningbo area are obtained by means of blasting vibration observation and analysis based on engineering. By regression analysis of observation results, the empirical formulas of the peak vibration velocity of particle vibration in the vertical direction, horizontal radial direction and horizontal tangential direction of the near surface, long-distance railway subgrade and building foundation are obtained. 2. By analyzing the time-frequency characteristics of blasting seismic waves and comparing the distance between far and short, it is pointed out that the peak value of vibration velocity decreases faster in the horizontal direction than in the vertical direction with the decrease of the charge quantity and distance. In the earlier period, the peak value of particle vibration velocity attenuated with proportional charge, and the attenuation exponent was obvious. The main frequency distribution range of the main vibration is 1070 Hz, and the 10~20Hz frequency is the highest. The corresponding finite element numerical analysis model is established and the theory and numerical analysis of dynamic response and structural mode of three ancient buildings, brick tower, mountain gate and Tianwangdian are carried out, and the natural frequencies of each order are obtained. The results show that the first-order natural frequencies fit together. The second order and third order natural frequencies of the two kinds of analysis are different. At the same time, the maximum vibration velocity response value (dynamic compaction condition) of the three kinds of ancient buildings is much larger than the allowable value of the state key cultural relic buildings under the condition of industrial vibration source, which shows that the long-term effect of cyclic and continuous vibration is considered. Blasting earthquake may cause fatigue damage to ancient buildings. Therefore, when considering the cumulative effect of blasting earthquake, the standard value of particle vibration velocity criterion should be carefully taken into account. 4. 4. The results of dynamic response and vibration analysis of brick tower, mountain gate and double eaves of Tianwang Temple show that the natural frequencies of brick tower and Tianwang Hall are generally within the range of 1~10Hz, and the second and third natural frequencies of the gate have a tendency to increase. The blasting vibration may overlap with the natural frequency of the ancient building structure with the main vibration frequency, which will inevitably lead to the structural resonance and promote the dynamic response amplification. It is shown that the safety criterion of blasting vibration is scientific and reasonable considering the vibration speed and the main vibration frequency. 6. According to the actual situation of the project, this paper analyzes and puts forward the blasting seismic control technology and method of light rail tunnel: the choice of explosive type, the reasonable blasting method and method, the reasonable use of terrain and geological conditions, and the control of safe distance. Distinguish between types and categories of buildings.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.6;TU311.3
【参考文献】
相关期刊论文 前1条
1 何军,于亚伦,梁文基;爆破震动信号的小波分析[J];岩土工程学报;1998年01期
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