断层区域隧道爆破开挖的动力响应分析及注浆方案优化
发布时间：2018-09-05 13:14
【摘要】：随着我国隧道工程大量地修建,穿越断层等不良复杂地质地段的现象屡见不鲜。爆破开挖必然会对隧道围岩产生振动效应,造成不同程度的损伤破坏,导致断层围岩发生大变形和强振动,严重影响隧道的施工进度及安全修建。目前,断层区域隧道钻爆开挖下围岩施工力学行为的研究,已成为隧道工程领域的热点课题之一。针对上述问题,本文作者提出了断层区域隧道围岩爆破开挖下的动力响应分析及注浆方案优化这一研究课题,以深圳市葵坝路隧道为依托工程,在已有研究成果的基础上,进行了深入系统的研究。首先,分析断层的形成机制及其对隧道稳定性的影响,在此基础上,阐述了岩体爆破控制原理,为断层隧道在爆破振动作用下的动力响应分析奠定了理论基础。其次,基于相关爆破理论与工程经验,进行隧道爆破方案设计,通过设计和理论总装药量进行对比,验证了爆破设计方案的合理性,根据半理论半经验公式,计算并修正所得爆破荷载,使其满足冲击波波形的基本特征,最终将所求得的爆破荷载添加至有限元模型内,较好的实现了爆破荷载在隧道开挖中的模拟。运用ANSYS/LS-DYNA有限元软件,对断层区域隧道的爆破开挖过程进行三维数值模拟,分析不同倾角及位置下断层对隧道围岩动力响应的影响,得到断层隧道爆破作用下的最不利位置及其工况条件,判定爆破振动影响范围,指出隧道边墙与断层之间的最小安全距离,可以为断层隧道稳定性的研究提供依据,且为类似隧道工程的设计与施工提供参考。根据葵坝路隧道断层围岩的力学性质,提出了不同的注浆加固方案,通过未注浆与不同注浆范围方案进行数值分析,得到了适合于本工程的最优注浆范围,也验证了预注浆处理能有效控制断层围岩的动力响应,可为类似隧道工程注浆方案的优化设计提供借鉴。本文立足于学科前沿,采用了先进的数值计算方法与分析手段,开展了断层隧道的动力响应分析及其注浆方案优化的研究,所做研究工作具有较高的工程应用价值,为系统地进行断层隧道爆破开挖提供了一种有效地分析手段。
[Abstract]:With the construction of tunnel engineering in our country, the phenomenon of passing through faults and other bad and complicated geological sections is common. Blasting excavation will inevitably produce vibration effect on the surrounding rock of the tunnel, resulting in different degree of damage and destruction, resulting in large deformation and strong vibration of the fault surrounding rock, which seriously affects the construction progress and safe construction of the tunnel. At present, the mechanical behavior of surrounding rock under drilling and blasting excavation of tunnel in fault area has become one of the hot topics in tunnel engineering field. In view of the above problems, the author puts forward the research subject of dynamic response analysis and grouting scheme optimization under blasting excavation of surrounding rock of tunnel in fault area. Based on the existing research results, based on the project of Kuiba Road Tunnel in Shenzhen City. A deep and systematic study was carried out. Firstly, the formation mechanism of fault and its influence on tunnel stability are analyzed. On this basis, the principle of rock mass blasting control is expounded, which lays a theoretical foundation for dynamic response analysis of fault tunnel under blasting vibration. Secondly, based on the relevant blasting theory and engineering experience, the tunnel blasting scheme design is carried out. The rationality of the blasting design scheme is verified by comparing the design with the theoretical aggregate charge, according to the semi-theoretical and semi-empirical formula. The blasting load is calculated and corrected to meet the basic characteristics of the shock wave. Finally, the blasting load is added to the finite element model, and the blasting load simulation in the tunnel excavation is achieved. In this paper, ANSYS/LS-DYNA finite element software is used to simulate the blasting excavation process of tunnel in fault area, and the influence of fault on the dynamic response of tunnel surrounding rock under different dip angles and positions is analyzed. The most unfavorable position and working condition of fault tunnel blasting are obtained, the influence range of blasting vibration is determined, and the minimum safe distance between tunnel side wall and fault is pointed out, which can provide the basis for studying the stability of fault tunnel. It also provides reference for the design and construction of similar tunnel engineering. According to the mechanical properties of the surrounding rock of the fault of Kwai Ba Road Tunnel, different grouting reinforcement schemes are put forward, and the optimum grouting range is obtained by numerical analysis of different grouting range schemes and non-grouting schemes. It is also proved that pre-grouting treatment can effectively control the dynamic response of fault surrounding rock and can be used as a reference for the optimization design of grouting schemes in similar tunnel engineering. In this paper, based on the frontier of the subject, the dynamic response analysis of fault tunnel and the optimization of grouting scheme are carried out by using advanced numerical calculation method and analysis method. The research work has high engineering application value. It provides an effective analysis method for blasting excavation of fault tunnel.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.6
，
本文编号：2224384
[Abstract]:With the construction of tunnel engineering in our country, the phenomenon of passing through faults and other bad and complicated geological sections is common. Blasting excavation will inevitably produce vibration effect on the surrounding rock of the tunnel, resulting in different degree of damage and destruction, resulting in large deformation and strong vibration of the fault surrounding rock, which seriously affects the construction progress and safe construction of the tunnel. At present, the mechanical behavior of surrounding rock under drilling and blasting excavation of tunnel in fault area has become one of the hot topics in tunnel engineering field. In view of the above problems, the author puts forward the research subject of dynamic response analysis and grouting scheme optimization under blasting excavation of surrounding rock of tunnel in fault area. Based on the existing research results, based on the project of Kuiba Road Tunnel in Shenzhen City. A deep and systematic study was carried out. Firstly, the formation mechanism of fault and its influence on tunnel stability are analyzed. On this basis, the principle of rock mass blasting control is expounded, which lays a theoretical foundation for dynamic response analysis of fault tunnel under blasting vibration. Secondly, based on the relevant blasting theory and engineering experience, the tunnel blasting scheme design is carried out. The rationality of the blasting design scheme is verified by comparing the design with the theoretical aggregate charge, according to the semi-theoretical and semi-empirical formula. The blasting load is calculated and corrected to meet the basic characteristics of the shock wave. Finally, the blasting load is added to the finite element model, and the blasting load simulation in the tunnel excavation is achieved. In this paper, ANSYS/LS-DYNA finite element software is used to simulate the blasting excavation process of tunnel in fault area, and the influence of fault on the dynamic response of tunnel surrounding rock under different dip angles and positions is analyzed. The most unfavorable position and working condition of fault tunnel blasting are obtained, the influence range of blasting vibration is determined, and the minimum safe distance between tunnel side wall and fault is pointed out, which can provide the basis for studying the stability of fault tunnel. It also provides reference for the design and construction of similar tunnel engineering. According to the mechanical properties of the surrounding rock of the fault of Kwai Ba Road Tunnel, different grouting reinforcement schemes are put forward, and the optimum grouting range is obtained by numerical analysis of different grouting range schemes and non-grouting schemes. It is also proved that pre-grouting treatment can effectively control the dynamic response of fault surrounding rock and can be used as a reference for the optimization design of grouting schemes in similar tunnel engineering. In this paper, based on the frontier of the subject, the dynamic response analysis of fault tunnel and the optimization of grouting scheme are carried out by using advanced numerical calculation method and analysis method. The research work has high engineering application value. It provides an effective analysis method for blasting excavation of fault tunnel.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.6
，
本文编号：2224384
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