本文選題：高鐵 + 小間距并行��； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：隨著國(guó)民經(jīng)濟(jì)和交通運(yùn)輸行業(yè)的快速發(fā)展,高速鐵路不斷延伸,新建線路也越來(lái)越密集化,這也導(dǎo)致了并行或者下穿高鐵建造的工程不斷涌現(xiàn)。為了保證高鐵的平順性及運(yùn)營(yíng)安全,高鐵必須保持極高的穩(wěn)定性,因此對(duì)于高鐵位移的要求非常嚴(yán)格。隧道并行高鐵進(jìn)行開(kāi)挖時(shí),不僅要保證自身的施工質(zhì)量與安全,還需要考慮有可能引起的高鐵基礎(chǔ)及上部結(jié)構(gòu)位移,若位移過(guò)大,將會(huì)影響到高鐵的正常運(yùn)營(yíng),故分析隧道施工對(duì)其鄰近高鐵產(chǎn)生的影響非常有必要。目前國(guó)內(nèi)外對(duì)于水下隧道并行高鐵建設(shè)的先例并不多,對(duì)于高鐵的影響分析一般參考基坑鄰近高鐵開(kāi)挖以及隧道下穿高鐵施工的范例,因此,本文依托于小間距并行京滬高鐵建造的水下明挖隧道工程,研究間距、降水及施工工序?qū)τ诟哞F產(chǎn)生的影響,分析水下明挖隧道對(duì)其鄰近高鐵的影響規(guī)律。首先,介紹了隧道開(kāi)挖造成鄰近高鐵樁基水平及豎向位移的計(jì)算分析方法。通過(guò)兩階段分析方法,先求出隧道開(kāi)挖造成的外側(cè)土體變形,再以土體的變形對(duì)高鐵下部樁基變形進(jìn)行求解分析,以土與樁基之間的相互作用推導(dǎo)樁基礎(chǔ)在隧道開(kāi)挖過(guò)程中的位移響應(yīng)問(wèn)題,分析了不同分層土體中樁基的位移計(jì)算方法,研究了隧道鄰近單樁與群樁的位移傳遞關(guān)系。其次,通過(guò)有限差分?jǐn)?shù)值模擬軟件,建立明挖隧道與高鐵數(shù)值模型,分析明挖隧道與高鐵不同間距下隧道開(kāi)挖引起高鐵位移的變化規(guī)律,模擬分析不同間距下高鐵樁基及橋墩的位移變化情況,根據(jù)高鐵位移限值,研究了隧道與高鐵合理可行的間距,結(jié)果顯示50m間距以上高鐵的正常運(yùn)營(yíng)不受到干擾,30m以下間距將不能保證高鐵的運(yùn)營(yíng)安全,工程設(shè)計(jì)及施工時(shí)應(yīng)對(duì)間距因素全面充分地進(jìn)行分析研究,降低隧道施工對(duì)高鐵造成的影響。然后,針對(duì)水下隧道的施工,探討了降水對(duì)鄰近高鐵產(chǎn)生的影響。通過(guò)模擬不同的降水工況,研究了不同降水速率對(duì)于隧道自身及高鐵所帶來(lái)的變化,分析了在一次降水、兩階段降水及隨開(kāi)挖層分次降水這三種不同降水工況下,隧道和鄰近高鐵位移及孔隙水壓力的變化規(guī)律,模擬結(jié)果表明分層降水的方式能較大程度地減小降水對(duì)高鐵所帶來(lái)的影響。模擬分析了明挖隧道開(kāi)挖過(guò)程中高鐵樁基及橋墩的位移響應(yīng)規(guī)律。對(duì)于隧道的各個(gè)開(kāi)挖與支護(hù)階段,以數(shù)值模擬的方式研究由土體損失造成的鄰近高鐵的變形情況,與高鐵橋墩的位移限定值進(jìn)行對(duì)比分析,研究在各個(gè)開(kāi)挖過(guò)程的位移變化,分析表明,隧道上級(jí)臺(tái)階基坑開(kāi)挖引起高鐵橋墩的位移占高鐵橋墩位移的70%。最后,針對(duì)間距、降水以及開(kāi)挖的影響,對(duì)高鐵結(jié)構(gòu)位移采取了安全防護(hù)措施,最大限度減小施工對(duì)高鐵帶來(lái)的干擾,現(xiàn)場(chǎng)施工情況以及監(jiān)測(cè)結(jié)果表明,安全防護(hù)措施對(duì)減小高鐵位移起積極的作用,從而為類(lèi)似工程的高鐵防護(hù)工作提供參考借鑒。
[Abstract]:With the rapid development of the national economy and transportation industry, the high speed railway continues to extend, and the new lines are becoming more and more intensive, which also leads to the continuous emergence of parallel or high speed rail construction projects. In order to ensure the smooth and operational safety of the high speed rail, the high speed rail must maintain a high stability. Therefore, the requirements for the high speed rail displacement are required. It is very strict. When the tunnel parallel high speed rail is excavated, it is not only to ensure the quality and safety of its own construction, but also to consider the possible cause of the high iron base and the displacement of the superstructure. If the displacement is too large, it will affect the normal operation of the high speed rail. Therefore, it is necessary to analyze the influence of the tunnel construction on its adjacent high speed rail. There are few precedents for the parallel high speed railway construction in underwater tunnel. The analysis of the influence of the high speed rail is generally referred to the example of the excavation near the foundation pit and the construction of the high speed rail under the tunnel. Therefore, this paper is based on the underwater tunnel constructed at the small distance and parallel to the Beijing-Shanghai high-speed railway, and studies the shadow of the distance, precipitation and construction process for the high speed rail. The influence law of the underwater tunnel on its adjacent high speed rail is analyzed. First, the calculation and analysis method of the horizontal and vertical displacement of the adjacent high iron pile foundation is introduced. Through the two stage analysis method, the deformation of the lateral soil body caused by the tunnel excavation is obtained, and the deformation of the high iron pile foundation is solved by the deformation of the soil. Based on the interaction between soil and pile foundation, the displacement response of pile foundation in tunnel excavation is deduced, the displacement calculation method of pile foundation in different layered soil is analyzed, and the displacement transfer relationship between single pile and group pile is studied. Secondly, through the finite difference fraction simulation software, the excavation tunnel and the high speed iron numerical model are established. The variation of the displacement of the high speed rail caused by tunnel excavation under different spacing between the tunnel and the high speed rail is analyzed. The displacement changes of the high speed iron pile foundation and the pier under different spacing are simulated and analyzed. According to the limit value of the high speed rail, the reasonable and feasible distance between the tunnel and the high speed rail is studied. The results show that the normal operation of the high speed rail above the 50m spacing is not disturbed, 30 The distance between M and below will not guarantee the safety of the high speed rail. The influence of tunnel construction on the high speed rail will be analyzed fully and fully to reduce the influence of tunnel construction on the high speed rail. Then, the effect of precipitation on the adjacent high speed rail is discussed in the light of the construction of underwater tunnel. The variation of the precipitation rate to the tunnel itself and the high speed rail is analyzed. The variation of the tunnel and adjacent high speed iron displacement and pore water pressure in the three different precipitation conditions of the first precipitation, the two stage of precipitation and the sub precipitation with the excavation layer are analyzed. The simulation results show that the precipitation method can greatly reduce the precipitation to the high speed rail. The displacement response law of the high iron pile foundation and the pier in the excavation of the tunnel is simulated and analyzed. For each excavation and support stage of the tunnel, the deformation of the adjacent high iron caused by the soil loss is studied by numerical simulation, and the displacement limit value of the high iron bridge pier is compared and analyzed, and the excavation is studied in each excavation. The change of the displacement of the process shows that the displacement of the high iron bridge pier is 70%. at the end of the high iron bridge pier excavation at the higher level of the tunnel. In view of the influence of the distance, precipitation and excavation, the safety protection measures are taken to the displacement of the high iron structure to minimize the interference caused by the construction to the high speed rail, the construction situation of the site and the monitoring knot. The results show that the safety protection measures play a positive role in reducing the displacement of high speed rail, so as to provide reference for similar works.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U455.4;U238

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