三維有限元分析方法評估隧道開挖對建筑結(jié)構(gòu)的影響
發(fā)布時間：2019-03-18 09:47
【摘要】：隨著城市的快速發(fā)展,在建設(shè)地下軌道方面,隧道開挖所引起的地表沉降對周邊結(jié)構(gòu)的影響的評估成為很關(guān)鍵的一個分支。本文的目的主要是通過使用三維有限元方法,評估盾構(gòu)隧道開挖對地表沉降以及地表運動所帶來的地面建筑結(jié)構(gòu)變形的影響。 為了達到這一目的,在理論方面,主要根據(jù)英國教授Potts和Zdravkovic提出的有限元分析方法；在研究對象方面,針對無建筑情況和地表建有混凝土框架結(jié)構(gòu)建筑的情況分別進行考慮；在軟件應(yīng)用方面,主要采用ABAQUS/CAE對上述兩種研究對象情況分別進行三維有限元模擬分析。首先,基于本論文的工程背景選取適合的參數(shù)與幾何尺寸,建立三維有限元模型；之后,以無建筑存在條件和有建筑存在條件這兩種情況為研究對象進行軟件模擬分析并考慮不同的參數(shù),包括隧道襯砌剛度的大小、地表建筑結(jié)構(gòu)剛度的大小、建筑偏心距與寬度之比e/B,并與現(xiàn)場測量數(shù)據(jù)和相關(guān)設(shè)計曲線進行比較。通過分析和比較可知,無建筑條件下,隨著開挖深度的增加,地表在橫斷面和縱斷面處的沉降逐漸增大,且襯砌剛度越小,地表沉降值越大；有建筑條件下,當(dāng)偏心距e=0、不同樓層建筑時,建筑的結(jié)構(gòu)剛度越大(即樓層越高),其對松弛區(qū)和拱區(qū)的建筑位移約束越強,當(dāng)樓層不變、e/B不同時,e/B越大,松弛區(qū)建筑的位移越小,而拱區(qū)建筑的位移越大。 本文的創(chuàng)新點在于： 1、本文采用“相對剛度法”來等效模擬實際的建筑結(jié)構(gòu),這樣做的優(yōu)點在于采用三維殼單元來等效替代建筑,通過輸入不同的參數(shù)來等效替代不同樓層,節(jié)省了大量的時間和計算存儲空間； 2、在參數(shù)分析中,本文將建筑偏心距與建筑寬度整合為一個參數(shù)e/B來考慮； 3、本文以相對抗彎剛度ρ*和修正因子M為兩個比較指標(biāo),將各參數(shù)進行歸一化考慮,并將其計算結(jié)果與設(shè)計曲線進行比較,以評估地表建筑的安全性。 本文共有圖65幅,表15個,參考文獻71篇。
[Abstract]:With the rapid development of the city, the assessment of the influence of ground subsidence caused by tunnel excavation on the surrounding structure becomes a key branch in the construction of underground track. The purpose of this paper is to evaluate the influence of shield tunnel excavation on surface subsidence and ground structure deformation caused by surface movement by using three-dimensional finite element method. In order to achieve this goal, in theory, mainly according to the British professors Potts and Zdravkovic put forward the finite element analysis method, in the research object, in view of the no-building situation and the construction of concrete frame structure on the ground are considered separately; In the aspect of software application, the three-dimensional finite element simulation and analysis of the above two kinds of research objects are mainly carried out by using ABAQUS/CAE. Firstly, based on the engineering background of this paper, the suitable parameters and geometric dimensions are selected, and the 3D finite element model is established. After that, the software is used to simulate and analyze the non-existence condition and the existing condition of the building, and consider the different parameters, including the stiffness of tunnel lining and the stiffness of the building structure on the ground. The ratio of eccentricity to width of the building is compared with field measurement data and related design curves. Through the analysis and comparison, it can be seen that with the increase of excavation depth, the settlement of the surface at the cross-section and the longitudinal section increases gradually, and the smaller the stiffness of the lining, the greater the settlement value of the surface. In the case of buildings with eccentricity and different floors, the greater the structural stiffness (that is, the higher the floor), the stronger the structural displacement constraints on the relaxation zone and the arch area, and when the floors remain unchanged, the larger the eb is, the greater the structural stiffness (that is, the higher the floor), the stronger the structural displacement constraints on the relaxation zone and the arch area. The smaller the displacement of relaxed buildings is, the greater the displacement of arched buildings is. The innovation of this paper is as follows: 1, this paper uses "relative stiffness method" to simulate the actual building structure, and the advantage of this method is that the three-dimensional shell element is used to replace the building equivalent. By inputting different parameters to replace different floors, a lot of time and storage space can be saved. 2. In the parameter analysis, the eccentricity and the width of the building are integrated into a parameter E _ (B) to consider the eccentricity of the building and the width of the building. 3, taking the relative bending stiffness 蟻 * and the correction factor M as two comparative indexes, the parameters are normalized, and the calculated results are compared with the design curves to evaluate the safety of the surface buildings. In this paper, there are 65 diagrams, 15 tables and 71 references.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455;TU433
[Abstract]:With the rapid development of the city, the assessment of the influence of ground subsidence caused by tunnel excavation on the surrounding structure becomes a key branch in the construction of underground track. The purpose of this paper is to evaluate the influence of shield tunnel excavation on surface subsidence and ground structure deformation caused by surface movement by using three-dimensional finite element method. In order to achieve this goal, in theory, mainly according to the British professors Potts and Zdravkovic put forward the finite element analysis method, in the research object, in view of the no-building situation and the construction of concrete frame structure on the ground are considered separately; In the aspect of software application, the three-dimensional finite element simulation and analysis of the above two kinds of research objects are mainly carried out by using ABAQUS/CAE. Firstly, based on the engineering background of this paper, the suitable parameters and geometric dimensions are selected, and the 3D finite element model is established. After that, the software is used to simulate and analyze the non-existence condition and the existing condition of the building, and consider the different parameters, including the stiffness of tunnel lining and the stiffness of the building structure on the ground. The ratio of eccentricity to width of the building is compared with field measurement data and related design curves. Through the analysis and comparison, it can be seen that with the increase of excavation depth, the settlement of the surface at the cross-section and the longitudinal section increases gradually, and the smaller the stiffness of the lining, the greater the settlement value of the surface. In the case of buildings with eccentricity and different floors, the greater the structural stiffness (that is, the higher the floor), the stronger the structural displacement constraints on the relaxation zone and the arch area, and when the floors remain unchanged, the larger the eb is, the greater the structural stiffness (that is, the higher the floor), the stronger the structural displacement constraints on the relaxation zone and the arch area. The smaller the displacement of relaxed buildings is, the greater the displacement of arched buildings is. The innovation of this paper is as follows: 1, this paper uses "relative stiffness method" to simulate the actual building structure, and the advantage of this method is that the three-dimensional shell element is used to replace the building equivalent. By inputting different parameters to replace different floors, a lot of time and storage space can be saved. 2. In the parameter analysis, the eccentricity and the width of the building are integrated into a parameter E _ (B) to consider the eccentricity of the building and the width of the building. 3, taking the relative bending stiffness 蟻 * and the correction factor M as two comparative indexes, the parameters are normalized, and the calculated results are compared with the design curves to evaluate the safety of the surface buildings. In this paper, there are 65 diagrams, 15 tables and 71 references.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455;TU433
【參考文獻】
相關(guān)期刊論文 前10條
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6 李煜，
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