【摘要】：隨著我國城市化的進一步深入，城市人口不斷增加，因此擴大城市的可利用空間變得尤為重要。從交通和居住兩方面來考慮，越來越多的城市通過興建地鐵與高層住宅來緩解人口密集所帶來的問題。不可避免的就會在運營地鐵線路周圍興建高層建筑物，由于建筑物的基坑施工會引起基坑周圍土體的擾動，進而對鄰近地鐵區(qū)間隧道產(chǎn)生一定作用。基于此，研究基坑施工對鄰近地鐵的影響意義重大。 本文以鄰近天津地鐵9號線大王莊站至十一徑路站區(qū)間隧道的中糧集團某房地產(chǎn)深基坑施工為背景，采用現(xiàn)場監(jiān)測與數(shù)值模擬相結(jié)合的方法進行研究。實際監(jiān)測階段主要包括前期的施工降水、基坑的土方開挖與基坑底板施工，采用信息化的監(jiān)測方法，對地鐵隧道的水平與豎向位移進行了重點監(jiān)測。數(shù)值模擬采用了大型有限元軟件ANSYS，將基坑、圍護結(jié)構(gòu)及地鐵隧道作為整體進行建模，采用水土分算的方法，利用ANSYS中的單元“生死”功能模擬基坑土方開挖的過程，對基坑施工進行了三維數(shù)值模擬研究。最后將數(shù)值模擬結(jié)果同現(xiàn)場監(jiān)測結(jié)果進行對比，趨勢相同，吻合較好。 通過一系列分析，基坑施工對鄰近地鐵區(qū)間有一定的影響，主要體現(xiàn)在基坑開挖所對應的地鐵區(qū)間將會產(chǎn)生朝向基坑方向的水平位移與向下的豎直位移，并且豎向位移遠大于水平位移；另外，由于天津地區(qū)地下水較為豐富，在基坑施工的過程中，，基坑降水對地鐵具有較大的影響，建議在今后的施工過程應予以高度的重視。
[Abstract]:With the further development of urbanization in China, the urban population is increasing, so it is very important to expand the available space of cities. In terms of both transportation and housing, more and more cities are building subways and high-rise housing to alleviate the problems caused by population density. It is inevitable that high-rise buildings will be built around the subway lines. Because the foundation pit construction of the building will cause disturbance of soil around the foundation pit, it will play a certain role in the adjacent subway tunnel. Based on this, it is of great significance to study the influence of foundation pit construction on adjacent subways. Based on the construction of a real estate deep foundation pit in a real estate of Cofco Group which is adjacent to the tunnel between Dawangzhuang Station of Tianjin Metro Line 9 and the station area of Xi Jing Road, this paper adopts the method of combining field monitoring and numerical simulation to study the construction of deep foundation pit of a real estate of Cofco Group. The actual monitoring stage mainly includes the pre-construction dewatering, the excavation of foundation pit and the construction of foundation pit floor. The level and vertical displacement of subway tunnel are mainly monitored by using the information monitoring method. The numerical simulation uses the large-scale finite element software ANSYS, to model the foundation pit, the enclosure structure and the subway tunnel as a whole, and uses the method of soil and water division to simulate the excavation process of the foundation pit by using the function of "life and death" in ANSYS. The three-dimensional numerical simulation of foundation pit construction is carried out. Finally, the numerical simulation results are compared with the field monitoring results, the trend is the same and the agreement is good. Through a series of analyses, the foundation pit construction has a certain influence on the adjacent subway section, which is mainly reflected in the horizontal displacement in the direction of the foundation pit and the vertical displacement down in the subway section corresponding to the excavation of the foundation pit. And the vertical displacement is far greater than the horizontal displacement; in addition, because of the abundance of groundwater in Tianjin area, the foundation pit dewatering has great influence on the subway during the foundation pit construction, so it is suggested that high attention should be paid to the construction process in the future.
【學位授予單位】：石家莊鐵道大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU753;U231

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