本文關鍵詞：鐵路隧道底部結(jié)構(gòu)隆起變形及其工程對策研究　出處：《北京交通大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： 鐵路隧道 底部結(jié)構(gòu) 隆起變形 強度劣化 工程對策

【摘要】：我國新建鐵路隧道大部分采用無砟軌道,對隧道底部變形的要求非常嚴格。運營和在建的鐵路隧道常有底部隆起變形發(fā)生,給行車安全和工程建設帶來很大困難,急需深入研究并加以解決。但是,由于隧道底部結(jié)構(gòu)隆起變形的機理非常復雜,目前尚缺乏合理的力學分析基礎,以及相應的工程對策。所以,研究鐵路隧道底部結(jié)構(gòu)隆起變形機理以及工程對策具有重要意義。本文首先通過調(diào)查國內(nèi)外的鐵路隧道底部隆起變形事例以及相關的巖石強度試驗結(jié)果,分析鐵路隧道底部結(jié)構(gòu)隆起的影響因素和變形機理：然后,以蘭新鐵路福川隧道為背景,采用數(shù)值模擬的手段,研究含有少量膨脹性黏土礦物的沉積巖地質(zhì)條件下鐵路隧道底部隆起現(xiàn)象：最后,分析抑制鐵路隧道底部結(jié)構(gòu)隆起變形的工程對策。主要研究成果如下：(1)通過文獻調(diào)查和資料收集,對鐵路隧道底部結(jié)構(gòu)隆起變形的發(fā)生條件進行梳理,從地質(zhì)巖性、圍巖受力以及地下水等方面進行分析,明確了隧道底部隆起變形的機理主要有兩大類,即隧道底部圍巖的塑性變形(squeezing)和吸水膨脹(swelling)。(2)根據(jù)既往的有關沉積巖強度的試驗結(jié)果,發(fā)現(xiàn)含水率對巖體強度,特別是泥巖、泥質(zhì)砂巖以及凝灰?guī)r等沉積巖的強度有較大的影響,含水率增大會顯著降低巖體的強度。(3)在彈粘塑性理論的基礎上,采用強度劣化有限元模型分析了鐵路隧道底部結(jié)構(gòu)隆起變形的力學機理。隧道底部圍巖,由于含水率的增加,可能導致圍巖強度的降低,使得底部圍巖的塑性變形增大,引起底部結(jié)構(gòu)隆起變形。(4)依據(jù)強度劣化理論模型,采用數(shù)值模擬的手段,模擬蘭新鐵路福川隧道底部隆起現(xiàn)象。根據(jù)仰拱厚度不同分兩種工況,得出隨著圍巖粘聚力的降低,底部結(jié)構(gòu)隆起變形逐漸增大,底部拉應力數(shù)值和范圍逐漸增大,底部結(jié)構(gòu)和圍巖塑性區(qū)也逐漸增大；仰拱厚度的不足使得圍巖強度劣化引起的底部結(jié)構(gòu)隆起變形更加顯著。得到的隆起變形量以及仰拱填充層開裂的結(jié)果大致與現(xiàn)場監(jiān)測結(jié)果相符。(5)以蘭新鐵路福川隧道為模型,通過數(shù)值模擬研究鐵路隧道底部結(jié)構(gòu)隆起的工程對策,得出仰拱曲率的增大可以有效抑制圍巖強度劣化引起的底部結(jié)構(gòu)隆起變形。
[Abstract]:Most of the new railway tunnels in our country use ballastless track, which is very strict to the deformation of the bottom of the tunnel. The railway tunnel in operation and under construction often has the bottom uplift deformation. It brings great difficulties to traffic safety and engineering construction, and needs to be studied and solved. However, due to the complex mechanism of the uplift and deformation of the bottom structure of the tunnel, there is still a lack of a reasonable basis for mechanical analysis. And the corresponding engineering countermeasures. So... It is of great significance to study the deformation mechanism and engineering countermeasures of railway tunnel bottom structure uplift. Firstly, through investigation of domestic and foreign railway tunnel bottom uplift deformation cases and related rock strength test results. The influence factors and deformation mechanism of the railway tunnel bottom structure uplift are analyzed. Then, taking the Lanxin Railway Fuchuan Tunnel as the background, the method of numerical simulation is adopted. This paper studies the uplift of the bottom of railway tunnel under the geological conditions of sedimentary rocks containing a small amount of expansive clay minerals: finally. The main research results are as follows: 1) through literature investigation and data collection, the paper combs the occurrence conditions of railway tunnel bottom structure uplift deformation. Based on the analysis of geological lithology, stress of surrounding rock and groundwater, it is clear that there are two main types of deformation mechanism of tunnel bottom uplift. That is, plastic deformation of the surrounding rock at the bottom of the tunnel) and water absorption and expansion are based on the results of previous tests on the strength of sedimentary rocks. It is found that water content has great influence on the strength of rock mass, especially mudstone, argillaceous sandstone and tuff. On the basis of elastic-viscoplastic theory, the strength degradation finite element model is used to analyze the mechanical mechanism of the uplift and deformation of the railway tunnel bottom structure, and the surrounding rock at the bottom of the tunnel. Due to the increase of water content, the strength of surrounding rock may be reduced, and the plastic deformation of the bottom rock will increase, which will cause the uplift deformation of the bottom structure. (4) according to the theoretical model of strength degradation, the method of numerical simulation is adopted. Simulation of Lanxin Railway Fuchuan Tunnel bottom uplift phenomenon. According to the thickness of inverted arch is divided into two working conditions, it is concluded that with the decrease of surrounding rock cohesion, the bottom structure uplift deformation increases gradually. The value and range of the bottom tensile stress increase gradually, and the plastic zone of the bottom structure and surrounding rock increases gradually. The deformation of the bottom structure caused by the deterioration of the surrounding rock strength is more significant due to the insufficient thickness of the inverted arch, and the result of the uplift deformation and the crack of the infill layer of the inverted arch are roughly consistent with the field monitoring results. Take Fuchuan Tunnel of Lanxin Railway as the model. Through numerical simulation the engineering countermeasures of the uplift of the bottom structure of the railway tunnel are studied. It is concluded that the increase of the curvature of the inverted arch can effectively restrain the uplift deformation of the bottom structure caused by the deterioration of the surrounding rock strength.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U457.2

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