TST技术在隧道超前地质预报中的应用研究
发布时间：2019-05-13 23:27
【摘要】：改革开放以来,中国经济高速发展,伴随铁路及公路等线状工程数量的增长,大型隧道建设工程也越来越多。但是,施工安全、施工进度等都已成为隧道施工建设工程的关键因素。隧道建设工程的前期资料,如勘察资料、设计资料等,往往难与实际情况完全相符,必然存在一些误差,受此限制所作的设计亦不全合理,因此隧道施工所受影响更加明显。影响隧道施工安全的地质因素众多,如围岩完整性、围岩风化程度、富水层、节理裂隙、断层破碎带、地应力等,都会引起不同程度的崩塌、坍塌、突水、突泥等施工安全事故,从而影响施工进度,造成经济损失,甚至会出现人员安全事故。因此,在隧道施工阶段做好隧道超前地质预报工作显得尤为重要。本文主要阐述了TST地震散射波法的基本原理、TST现场工作方法、TST数据处理流程,结合牛步迳隧道超前地质预报工程实例,总结了TST在牛步迳隧道超前地质预报工作中的准确度及出现误判的原因,探讨了提高数据质量的可行性办法,在前人的研究成果的基础上,研究取得的主要认识如下:(1)综合分析评价了目前各种隧道超前预报的方法,并阐述了TST技术以地震波散射波法为基本理论、凭借散射波有效信息以及数值分析得到的岩石各属性参数值、快速准确地定位掌子面前方不良地质体的位置、大小及产状的优越性。(2)隧道施工过程中的干扰,如声波、面波、施工用电干扰等都会使得采集的数据质量降低,采用能量切除、F-K变换等方法对地震波信号进行切除。(3)对牛步迳隧道的TST预报数据进行分析总结,TST对隧道围岩分级准确度在67%左右,对节理裂隙、富水层预报准确度在70%左右,预报效果基本满足了隧道施工要求,可以在隧道超前地质预报中进行应用。
[Abstract]:Since the reform and opening up, with the rapid development of China's economy, with the increase of the number of linear projects such as railways and highways, there are more and more large-scale tunnel construction projects. However, construction safety and construction progress have become the key factors of tunnel construction. The preliminary data of tunnel construction project, such as survey data, design data and so on, are often difficult to fully conform to the actual situation, and there must be some errors. The design made by this restriction is not completely reasonable, so the influence on tunnel construction is more obvious. There are many geological factors that affect the safety of tunnel construction, such as the integrity of surrounding rock, the degree of weathered surrounding rock, the rich water layer, joint fissures, fault fracture zone, ground stress and so on, which will cause different degrees of collapse, collapse and water inrush. Mud outburst and other construction safety accidents, which affect the construction progress, resulting in economic losses, and even personnel safety accidents. Therefore, it is particularly important to do a good job of tunnel advance geological prediction in the tunnel construction stage. This paper mainly expounds the basic principle of TST seismic scattering wave method, TST field working method, TST data processing flow, and an example of advanced geological prediction of Niubujing tunnel. This paper summarizes the accuracy of TST in the advance geological prediction of Niubujing Tunnel and the causes of misjudgment, and probes into the feasible methods to improve the data quality, on the basis of the previous research results. The main understandings obtained are as follows: (1) the current methods of tunnel advance prediction are comprehensively analyzed and evaluated, and the basic theory of TST technology based on seismic wave scattering wave method is expounded. Based on the effective information of scattering wave and the parameter values of rock attributes obtained by numerical analysis, the position, size and occurrence of bad geological bodies in front of the palm surface can be located quickly and accurately. (2) interference in tunnel construction, such as acoustic wave, Surface wave, construction power interference and so on will reduce the quality of the collected data, and the seismic wave signal will be resected by energy removal, F 鈮，
本文编号：2476262
[Abstract]:Since the reform and opening up, with the rapid development of China's economy, with the increase of the number of linear projects such as railways and highways, there are more and more large-scale tunnel construction projects. However, construction safety and construction progress have become the key factors of tunnel construction. The preliminary data of tunnel construction project, such as survey data, design data and so on, are often difficult to fully conform to the actual situation, and there must be some errors. The design made by this restriction is not completely reasonable, so the influence on tunnel construction is more obvious. There are many geological factors that affect the safety of tunnel construction, such as the integrity of surrounding rock, the degree of weathered surrounding rock, the rich water layer, joint fissures, fault fracture zone, ground stress and so on, which will cause different degrees of collapse, collapse and water inrush. Mud outburst and other construction safety accidents, which affect the construction progress, resulting in economic losses, and even personnel safety accidents. Therefore, it is particularly important to do a good job of tunnel advance geological prediction in the tunnel construction stage. This paper mainly expounds the basic principle of TST seismic scattering wave method, TST field working method, TST data processing flow, and an example of advanced geological prediction of Niubujing tunnel. This paper summarizes the accuracy of TST in the advance geological prediction of Niubujing Tunnel and the causes of misjudgment, and probes into the feasible methods to improve the data quality, on the basis of the previous research results. The main understandings obtained are as follows: (1) the current methods of tunnel advance prediction are comprehensively analyzed and evaluated, and the basic theory of TST technology based on seismic wave scattering wave method is expounded. Based on the effective information of scattering wave and the parameter values of rock attributes obtained by numerical analysis, the position, size and occurrence of bad geological bodies in front of the palm surface can be located quickly and accurately. (2) interference in tunnel construction, such as acoustic wave, Surface wave, construction power interference and so on will reduce the quality of the collected data, and the seismic wave signal will be resected by energy removal, F 鈮，
本文编号：2476262
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