深基坑對周邊建筑結(jié)構(gòu)的影響及應(yīng)對措施
發(fā)布時間：2019-07-05 09:33
【摘要】：隨著我國城鎮(zhèn)化及建筑業(yè)的快速發(fā)展,城市的土地資源日趨緊張,城市建筑密度越來越大,為有效利用土地,城市建筑中出現(xiàn)大量高層及地下建筑,隨之,深基坑的的應(yīng)用越來越廣泛,規(guī)模也越來越大,但是在深基坑的施工過程中,如果防護(hù)效果不當(dāng),就會對臨近建筑及周邊設(shè)施產(chǎn)生一定影響,例如在基坑施工過程中周邊建筑結(jié)構(gòu)可能會出現(xiàn)局部破壞、地下管線斷裂、周邊路面塌陷,嚴(yán)重者會威脅建筑本身的安全,由于基坑變形后恢復(fù)難度很大,所以本文的應(yīng)對措施主要是針對建筑結(jié)構(gòu)的加固。本文重點研究了深基坑施工對周邊不同區(qū)域、不同距離的框架結(jié)構(gòu)建筑的基底位移、結(jié)構(gòu)內(nèi)力的影響,及因地基變形而產(chǎn)生局部破壞的已用建筑結(jié)構(gòu)加固方式。本文采用數(shù)值模擬來分析基坑對建筑的影響,其中基坑模擬采用有限差分軟件FLAC.3D,建筑模擬采用有限元軟件ETABS。具體研究內(nèi)容如下;(1)本文對基坑周邊不同區(qū)域、不同位置的建筑分為兩類來研究,當(dāng)建筑在垂直于基坑長邊方向上,由近及遠(yuǎn)存在位置變化時,基底的相對位移則是先增大后減小,大約在距基坑長邊20米左右出現(xiàn)轉(zhuǎn)折。而內(nèi)力變化遵循相同的規(guī)律。當(dāng)建筑處于平行基坑長邊方向時,由基坑長邊中點向兩邊進(jìn)行位置變化時,其相對位移先增大,中部變化不大,而后再減小,而在移動過程中建筑結(jié)構(gòu)的內(nèi)變化同樣如此,不難發(fā)現(xiàn),兩者具有很強的相關(guān)性。(2)基坑在分層開挖過程中建筑基底位移的絕對值并非一直在增大,例如在開挖達(dá)到一定深度時候,豎向位移開始出現(xiàn)反彈,其絕對值隨著開挖在不斷減小,即變化出現(xiàn)了轉(zhuǎn)折點,在基坑施工開挖過程中,要特別基底注意位移的轉(zhuǎn)折點,因為此時土體的運動方向可能改變了,應(yīng)加強基坑變形的監(jiān)測,由于豎向相對位移卻在增大,所以建筑的內(nèi)力還是在不斷變大。通過閱讀文獻(xiàn),發(fā)現(xiàn)基坑開挖模擬方式分為兩種,即一次開挖和分層開挖,本文對兩種開挖方式所得結(jié)果進(jìn)行比較,分層開挖得到的基底沉降和結(jié)構(gòu)內(nèi)力均偏大一點,而且分層開挖更符合基坑開挖的真實過程。(3)本文以結(jié)構(gòu)加固為具體應(yīng)對措施,并且選擇基坑周邊某一位置的建筑,采用PKPM進(jìn)行加固計算,由于此處建筑本來已經(jīng)存在,已經(jīng)在使用,所以加固時所不宜進(jìn)行大面積作業(yè),而且加固速度要快,不能耗時過長,不能對居民的正常生活造成影響,所以本文選擇選擇外包型鋼、粘貼鋼板法對梁、柱構(gòu)件進(jìn)行加固。本文通過對基坑周邊不同位置的,不同距離的結(jié)構(gòu)體的基底位移和內(nèi)力進(jìn)行分析,得到一部分結(jié)論,希望可以對實際工程提供一些參考。
[Abstract]:With the rapid development of urbanization and construction industry in our country, the land resources of the city are becoming more and more tense, and the density of urban buildings is increasing. In order to make effective use of land, a large number of high-rise and underground buildings appear in urban buildings. Subsequently, the application of deep foundation pit is more and more extensive and the scale is also larger and larger. However, in the construction process of deep foundation pit, if the protective effect is not appropriate, it will have a certain impact on the adjacent buildings and surrounding facilities. For example, in the process of foundation pit construction, the surrounding building structure may appear local damage, underground pipeline fracture, surrounding pavement collapse, serious will threaten the safety of the building itself, because it is very difficult to recover after foundation pit deformation, so the countermeasures in this paper are mainly aimed at the reinforcement of building structure. In this paper, the influence of deep foundation pit construction on the foundation displacement and internal force of frame structure buildings in different areas and distances is studied, and the local damage caused by foundation deformation is also studied. In this paper, the influence of foundation pit on building is analyzed by numerical simulation, in which the finite difference software FLAC.3D, is used to simulate the foundation pit. The finite element software ETABS. is used to simulate the foundation pit. The specific research contents are as follows: (1) in this paper, the buildings in different areas around the foundation pit are divided into two categories. When the buildings are perpendicular to the long side of the foundation pit and change from the near and far positions, the relative displacement of the foundation increases at first and then decreases, and turns about 20 meters from the long side of the foundation pit. The change of internal force follows the same law. When the building is in the parallel direction of the long edge of the foundation pit, when the position changes from the midpoint of the long edge of the foundation pit to the two sides, the relative displacement increases at first, but then decreases, but the internal change of the building structure is the same in the process of moving, so it is not difficult to find that there is a strong correlation between the two. (2) the absolute value of the displacement of the building foundation in the process of layered excavation is not always increasing. For example, when the excavation reaches a certain depth, the vertical displacement begins to rebound, and its absolute value decreases with the excavation, that is, the change appears a turning point. In the process of foundation pit construction, special attention should be paid to the turning point of the displacement, because the movement direction of the soil may change at this time, the monitoring of foundation pit deformation should be strengthened, because the vertical relative displacement is increasing, so the internal force of the building is still increasing. Through reading the literature, it is found that there are two kinds of foundation pit excavation simulation methods, that is, primary excavation and layered excavation. In this paper, the results of the two excavation methods are compared. The settlement of the foundation and the internal force of the structure obtained by the layered excavation are larger, and the layered excavation is more in line with the real process of the foundation pit excavation. (3) in this paper, structural reinforcement is taken as the specific response measure, and the building around the foundation pit is selected. Because the building here already exists and is already in use, the reinforcement should not be carried out in a large area, and the reinforcement speed should be fast, can not take too long, and can not affect the normal life of the residents. Therefore, this paper chooses the outer section steel method to reinforce the beam and column members. In this paper, the foundation displacement and internal force of structures with different positions and distances around the foundation pit are analyzed, and some conclusions are obtained, which hope to provide some references for practical engineering.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473;TU318
本文編號：2510434
[Abstract]:With the rapid development of urbanization and construction industry in our country, the land resources of the city are becoming more and more tense, and the density of urban buildings is increasing. In order to make effective use of land, a large number of high-rise and underground buildings appear in urban buildings. Subsequently, the application of deep foundation pit is more and more extensive and the scale is also larger and larger. However, in the construction process of deep foundation pit, if the protective effect is not appropriate, it will have a certain impact on the adjacent buildings and surrounding facilities. For example, in the process of foundation pit construction, the surrounding building structure may appear local damage, underground pipeline fracture, surrounding pavement collapse, serious will threaten the safety of the building itself, because it is very difficult to recover after foundation pit deformation, so the countermeasures in this paper are mainly aimed at the reinforcement of building structure. In this paper, the influence of deep foundation pit construction on the foundation displacement and internal force of frame structure buildings in different areas and distances is studied, and the local damage caused by foundation deformation is also studied. In this paper, the influence of foundation pit on building is analyzed by numerical simulation, in which the finite difference software FLAC.3D, is used to simulate the foundation pit. The finite element software ETABS. is used to simulate the foundation pit. The specific research contents are as follows: (1) in this paper, the buildings in different areas around the foundation pit are divided into two categories. When the buildings are perpendicular to the long side of the foundation pit and change from the near and far positions, the relative displacement of the foundation increases at first and then decreases, and turns about 20 meters from the long side of the foundation pit. The change of internal force follows the same law. When the building is in the parallel direction of the long edge of the foundation pit, when the position changes from the midpoint of the long edge of the foundation pit to the two sides, the relative displacement increases at first, but then decreases, but the internal change of the building structure is the same in the process of moving, so it is not difficult to find that there is a strong correlation between the two. (2) the absolute value of the displacement of the building foundation in the process of layered excavation is not always increasing. For example, when the excavation reaches a certain depth, the vertical displacement begins to rebound, and its absolute value decreases with the excavation, that is, the change appears a turning point. In the process of foundation pit construction, special attention should be paid to the turning point of the displacement, because the movement direction of the soil may change at this time, the monitoring of foundation pit deformation should be strengthened, because the vertical relative displacement is increasing, so the internal force of the building is still increasing. Through reading the literature, it is found that there are two kinds of foundation pit excavation simulation methods, that is, primary excavation and layered excavation. In this paper, the results of the two excavation methods are compared. The settlement of the foundation and the internal force of the structure obtained by the layered excavation are larger, and the layered excavation is more in line with the real process of the foundation pit excavation. (3) in this paper, structural reinforcement is taken as the specific response measure, and the building around the foundation pit is selected. Because the building here already exists and is already in use, the reinforcement should not be carried out in a large area, and the reinforcement speed should be fast, can not take too long, and can not affect the normal life of the residents. Therefore, this paper chooses the outer section steel method to reinforce the beam and column members. In this paper, the foundation displacement and internal force of structures with different positions and distances around the foundation pit are analyzed, and some conclusions are obtained, which hope to provide some references for practical engineering.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473;TU318
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