盾構(gòu)隧道下穿火車站站房及鐵路股道的分析研究
發(fā)布時間：2019-03-20 12:33
【摘要】：隨著城鎮(zhèn)化建設(shè)的加速進行，城市人口不斷增加，城市軌道交通建設(shè)得到了蓬勃的發(fā)展，目前，盾構(gòu)法是城市軌道交通建設(shè)的一種最常用的施工方法，截止2013年12月在全國35個大中城市都有應(yīng)用。在建筑物分布相對密集的城市中心區(qū)域采用該方法施工，會對施工范圍內(nèi)的地層產(chǎn)生較大的影響。對采用盾構(gòu)法施工的區(qū)間，當(dāng)隧道下穿既有城市鐵路運營股道和車站站房時，會使既有鐵路地表產(chǎn)生沉降和車站站房地基應(yīng)力發(fā)生變化。如果盾構(gòu)隧道施工對鐵路股道和車站站房基礎(chǔ)產(chǎn)生過大的擾動，那么就會影響其正常使用，因此，研究盾構(gòu)隧道施工對既有鐵路股道及車站站房基礎(chǔ)的影響具有重要的現(xiàn)實意義。 本文以南方某城市軌道交通1號線工程（南方某城市衡陽路至火車站區(qū)間，隧道下穿既有鐵路股道和車站站房基礎(chǔ)）為背景，以本工程的詳堪地質(zhì)資料為依據(jù)，，采用數(shù)值模擬的方法對盾構(gòu)下穿車站站房基礎(chǔ)、鐵路股道的地層沉降進行研究分析，主要研究成果如下： 首先，通過計算、分析盾構(gòu)掘進過程對既有鐵路股道（在自身條件和采取相應(yīng)工程措施條件下的）周圍地層沉降的影響，本文確定了盾構(gòu)掘進對鐵路路基沉降的橫向和縱向影響范圍為：縱向影響范圍約為65m，橫向影響范圍約為前方25m，后方28m，股道的最大沉降值達25.9mm，相鄰的鋼軌沉降差11.13mm。 其次，根據(jù)工程詳堪地質(zhì)提供的資料，通過數(shù)值模擬計算，得出盾構(gòu)隧道下穿車站站房基礎(chǔ)時，站房樁基的沉降變化及盾構(gòu)隧道管片應(yīng)力變化特征，站房樁基最大沉降約19.8mm，最大地面沉降值為22.3m(其中影響區(qū)范圍內(nèi)的最大樁基沉降差約4.5mm，最大相鄰樁基沉降差約2.6mm)；各施工階段，管片應(yīng)力相對較小，最大壓應(yīng)力約2.0MPa，最大拉應(yīng)力約1.0MPa；彎矩、軸力情況受施工先后的影響明顯，呈非對稱分布，先開挖隧道管片受力明顯大于后施工隧道的管片受力。 最后，本文根據(jù)數(shù)值模擬計算的結(jié)果，參考國內(nèi)在建工程實例，在保證加固質(zhì)量和盾構(gòu)機掘進參數(shù)合理的情況下，對下穿既有鐵路股道和車站站房基礎(chǔ)的隧道加固技術(shù)進行了初步研究，采用地面加固和洞內(nèi)注漿的方法對土層進行處理，可以使鐵路股道、車站站房基礎(chǔ)的沉降得到有效控制，滿足工程施工的要求，通過相關(guān)工程施工措施比選，確定了適合本工程的施工加固措施，確保了施工安全。本文的研究成果對隧道下穿既有建筑的設(shè)計施工具有一定的理論和實踐意義。
[Abstract]:With the acceleration of urbanization and the increasing of urban population, the construction of urban rail transit has been vigorously developed. At present, shield method is one of the most commonly used construction methods in urban rail transit construction. As of December 2013, it has been used in 35 large and medium-sized cities throughout the country. The application of this method in the urban central area where the buildings are relatively dense will have a great influence on the strata in the construction area. For the section constructed by shield method, when the tunnel passes through the existing urban railway operation unit and the station, the settlement of the existing railway surface and the change of the ground stress of the station building will occur when the tunnel passes through the existing urban railway operation unit and the station. If the construction of shield tunnel causes excessive disturbance to the foundation of railway stock way and station building, it will affect its normal use, so, It is of great practical significance to study the influence of shield tunnel construction on the foundation of existing railway stock way and station building. This paper is based on the background of a southern urban rail transit line 1 project (Hengyang Road to Railway Station, Tunnel under existing Railway Stock Road and Station Foundation), and based on the detailed geological data of this project. The numerical simulation method is used to study and analyze the ground subsidence of the shield through the station building foundation and the railway track. The main research results are as follows: firstly, through the calculation, the ground settlement of the railway track is studied and analyzed. This paper analyzes the influence of shield tunneling process on the ground subsidence around existing railway strands (under their own conditions and under the conditions of taking corresponding engineering measures). In this paper, the transverse and longitudinal influences of shield tunneling on the settlement of railway roadbed are determined as follows: the longitudinal influence range is about 65m, the transverse influence range is about 25m ahead, the rear area is 28m, and the maximum settlement value of the grooves is 25.9 mm. The adjacent rail settlement difference is 11.13 mm. Secondly, according to the data provided by the detailed geology of the engineering and through the numerical simulation calculation, the settlement change of the pile foundation of the shield tunnel and the stress change characteristics of the segment of the shield tunnel are obtained when the foundation of the station building under the shield tunnel passes through the station building foundation. The maximum settlement of the pile foundation is about 19.8mm and the maximum ground settlement value is 22.3 m (in which the maximum settlement difference of the pile foundation in the affected area is about 4.5 mm and the maximum settlement difference of the adjacent pile foundation is about 2.6mm). At each construction stage, the segment stress is relatively small, the maximum compressive stress is about 2.0 MPA, and the maximum tensile stress is about 1.0 MPA; The bending moment and axial force are obviously affected by the construction sequence and are asymmetrically distributed. The stress on the segments of the first excavation tunnel is obviously greater than that of the construction tunnel after the excavation. Finally, according to the results of numerical simulation and reference to the domestic construction projects under construction, under the condition of reasonable reinforcement quality and tunneling parameters of shield machine, this paper makes use of the results of numerical simulation and reference to the engineering examples under construction in China. This paper makes a preliminary study on the strengthening technology of tunnel through existing railway track and station building foundation. The settlement of railway stock road and station building foundation can be effectively controlled by the methods of ground reinforcement and grouting in the tunnel, and the settlement of railway stock track and station building foundation can be effectively controlled by the method of ground reinforcement and grouting in the tunnel. In order to meet the requirements of engineering construction, the construction reinforcement measures suitable for this project are determined through the comparison and selection of construction measures related to the project, and the construction safety is ensured. The research results of this paper have certain theoretical and practical significance for the design and construction of the existing buildings under the tunnel.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43
本文編號：2444219
[Abstract]:With the acceleration of urbanization and the increasing of urban population, the construction of urban rail transit has been vigorously developed. At present, shield method is one of the most commonly used construction methods in urban rail transit construction. As of December 2013, it has been used in 35 large and medium-sized cities throughout the country. The application of this method in the urban central area where the buildings are relatively dense will have a great influence on the strata in the construction area. For the section constructed by shield method, when the tunnel passes through the existing urban railway operation unit and the station, the settlement of the existing railway surface and the change of the ground stress of the station building will occur when the tunnel passes through the existing urban railway operation unit and the station. If the construction of shield tunnel causes excessive disturbance to the foundation of railway stock way and station building, it will affect its normal use, so, It is of great practical significance to study the influence of shield tunnel construction on the foundation of existing railway stock way and station building. This paper is based on the background of a southern urban rail transit line 1 project (Hengyang Road to Railway Station, Tunnel under existing Railway Stock Road and Station Foundation), and based on the detailed geological data of this project. The numerical simulation method is used to study and analyze the ground subsidence of the shield through the station building foundation and the railway track. The main research results are as follows: firstly, through the calculation, the ground settlement of the railway track is studied and analyzed. This paper analyzes the influence of shield tunneling process on the ground subsidence around existing railway strands (under their own conditions and under the conditions of taking corresponding engineering measures). In this paper, the transverse and longitudinal influences of shield tunneling on the settlement of railway roadbed are determined as follows: the longitudinal influence range is about 65m, the transverse influence range is about 25m ahead, the rear area is 28m, and the maximum settlement value of the grooves is 25.9 mm. The adjacent rail settlement difference is 11.13 mm. Secondly, according to the data provided by the detailed geology of the engineering and through the numerical simulation calculation, the settlement change of the pile foundation of the shield tunnel and the stress change characteristics of the segment of the shield tunnel are obtained when the foundation of the station building under the shield tunnel passes through the station building foundation. The maximum settlement of the pile foundation is about 19.8mm and the maximum ground settlement value is 22.3 m (in which the maximum settlement difference of the pile foundation in the affected area is about 4.5 mm and the maximum settlement difference of the adjacent pile foundation is about 2.6mm). At each construction stage, the segment stress is relatively small, the maximum compressive stress is about 2.0 MPA, and the maximum tensile stress is about 1.0 MPA; The bending moment and axial force are obviously affected by the construction sequence and are asymmetrically distributed. The stress on the segments of the first excavation tunnel is obviously greater than that of the construction tunnel after the excavation. Finally, according to the results of numerical simulation and reference to the domestic construction projects under construction, under the condition of reasonable reinforcement quality and tunneling parameters of shield machine, this paper makes use of the results of numerical simulation and reference to the engineering examples under construction in China. This paper makes a preliminary study on the strengthening technology of tunnel through existing railway track and station building foundation. The settlement of railway stock road and station building foundation can be effectively controlled by the methods of ground reinforcement and grouting in the tunnel, and the settlement of railway stock track and station building foundation can be effectively controlled by the method of ground reinforcement and grouting in the tunnel. In order to meet the requirements of engineering construction, the construction reinforcement measures suitable for this project are determined through the comparison and selection of construction measures related to the project, and the construction safety is ensured. The research results of this paper have certain theoretical and practical significance for the design and construction of the existing buildings under the tunnel.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U455.43
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