【作者】 李伟；

【导师】 芮勇勤；

【作者基本信息】 长沙理工大学 ， 道路与铁道工程， 2011， 硕士

【摘要】 近年来,土木工程建设中大量的隧道和地下工程开发与利用,有力地推进了和谐社会的快速发展与建设,取得了显著的经济效益和社会效益。隧道和地下工程技术是开发利用地壳潜在资源,进而更能实现工程的便利、节能、环保、安全、和经济的要求。但是,由于复杂的地质条件,使隧道技术工艺的发展与隧道工程建设的发展在一定程度的不协调,在隧道建设中容易出现掉块、塌方等隧道灾害。构造地应力是影响隧道围岩稳定的主要因素,对确定隧道开挖支护产生很大的影响。由此我们意识到构造地应力影响的隧道开挖支护力学特性是隧道不可忽视的一个问题。本论文针对构造地应力影响的隧道开挖支护问题,依托辽宁红沿河核电站隧道施工工程,利用有限元软件Phase2D,进行了构造地应力影响下的隧道围岩开挖支护的稳定性数值模拟分析,得出了不同构造地应力作用下的隧道开挖和初支围岩的变形规律,揭示了不同应力场围岩应力分布特征,以及不同应力场围岩位移分布特征;根据相似理论,开展了物理模型试验,通过模拟构造地应力对隧道围岩稳定性的影响,认识了构造地应力作用下的隧道围岩支护的变形破坏规律,以及构造地应力作用下的破坏模式;同时,与数值模拟分析成果互为认证,验证了施工设计的可靠和施工方案的合理。在获得隧道施工中掌子面多个关键技术参数的基础上,利用岩体基本质量指标(BQ)、巴顿岩体质量指标(Q)分级和岩体地质力学指标值(RMR)评价方法,进行了围岩级别分类的动态分析与评价,确立了合理的支护类型和施工参数。本论文采用了数值分析与模型试验方法的相互结合,是研究基于构造地应力影响的隧道开挖支护力学特性的一次初步的尝试,为构造地应力影响的隧道开挖支护提供了一定的参考,辅助设计施工,来降低隧道施工的风险和加快隧道施工的进度。更多还原

【Abstract】 In recent years, among the civil engineering construction, the development and utilization of much tunnel and underground engineering, has effectively promoted the rapid development of the harmonious society with construction and achieved remarkable economic and social benefits. The tunnel and underground engineering technology is the potential resource on the development and utilization of the crust, and it can much more realize the demands of engineering convenience, energy saving, environmental protection, safety, and economy. However, due to the complicated geological conditions, the development of the tunnel technology and the development of the tunnel construction in a certain degree of are not harmonious, which is easily prone to swap blocks, the tunnel collapse and other disasters during the tunnel construction. Tectonic stress is the main factor among affecting the stability of tunnel surrounding rock and generates a lot of influence on determining tunnel excavation supporting. Thus we realize the characteristics of tunnel excavation supporting mechanics which is affected by tectonic stress is a neglectable problem.This thesis ,aiming to tectonic stress effecting on tunnel excavation supporting problem, relying on Liaoning red river nuclear tunnel construction engineering, and using finite element software Phase2D, analysed the stability of surrounding rock of tunnel excavation and supporting under the tectonic stress influence, obtained the rule of surrounding rock tunnel excavation and the teams under different tectonic stress, reveals the distribution characteristics of the different Stress field of rock stress and Stress field of rock-bit. According to the similarity theory, we carried out the physical model test, and through the simulation of tectonic stress influencing on surrounding rock’s stability, understanded the deformation and damage law and the damage model of the tunnel surrounding rock under the action of the tectonic stress; Meanwhile, certifying with the numerical simulation results verified the reliability of the construction design and the reasonability of the construction scheme. On getting more key technology parameters of the tunnel construction, using the evaluation method of BQ, Q and RMR analysed and evaluated the classification of the rock level dynamicly, and established the reasonable supporting types and construction parameters.This paper by using the numerical analysis and model test methods, is a preliminary attempt on the mechanical characteristics of the study of tunnel excavation supporting under tectonic stress influence, which provides a certain reference, computer-aided design construction, to reduce the risk of tunnel construction and to speed up the construction of the tunnel.更多还原