發(fā)布時間：2018-06-12 20:13

  本文選題：基坑 + 建筑物��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：深基坑的開挖通常位于城市中心,基坑工程的周邊環(huán)境十分復(fù)雜,通常存在各種建(構(gòu))筑物。這就要求基坑支護(hù)除滿足強(qiáng)度要求外,還需滿足變形要求�；拥脑O(shè)計理念也由強(qiáng)度控制變?yōu)樽冃慰刂啤６徑ㄖ锏拇嬖跁够娱_挖的變形與無建筑時有所不同。因此本文分別研究了無建筑、超載以及存在建筑物時基坑的變形規(guī)律,主要研究內(nèi)容如下： 1、總結(jié)了基坑變形和建筑物變形的國內(nèi)外現(xiàn)狀,簡要概述了基坑的變形機(jī)理和變形預(yù)測方法以及建筑物變形的預(yù)測方法。 2、本文建立FLAC3D三維模型,分析了基坑開挖的墻后地表沉降規(guī)律以及圍護(hù)樁的水平變形規(guī)律。墻后地表沉降的變形模式均為凹槽型,圍護(hù)樁的水平變形模式均表現(xiàn)為“中間大,兩端小”的形狀。并且分析了基坑的空間效應(yīng),基坑的墻后地表沉降以及圍護(hù)樁的水平變形都有很明顯的角隅效應(yīng),越是靠近基坑的角部,其變形值都在逐步減小。 3、研究了樁直徑、樁間距、錨索水平間距對基坑變形的影響。隨著樁直徑的增大,基坑長短邊的墻后土體地表沉降和圍護(hù)樁的水平變形都逐漸減�。浑S著樁間距或錨索水平間距的增大,基坑長短邊的墻后土體地表沉降和圍護(hù)樁的水平變形都逐漸增大。 4、研究了鄰近建筑物時基坑開挖的三維變形規(guī)律。分析了建筑物的存在對墻后地表沉降規(guī)律和圍護(hù)樁水平變形規(guī)律的影響。發(fā)現(xiàn)存在建筑物時,基坑墻后的地表沉降仍為凹槽型,但在建筑物的邊界處,沉降曲線的斜率發(fā)生突變,而且建筑物的最大沉降并不發(fā)生在建筑物下方土體處。并與超載作用下的基坑變形規(guī)律進(jìn)行對比,發(fā)現(xiàn)建筑物作用下的墻后地表沉降要小于超載作用下的基坑變形,但圍護(hù)樁的水平變形相差較小。 5、分析了建筑物的距離、荷載、剛度對基坑變形的影響。發(fā)現(xiàn)隨著建筑物距離基坑邊的增大,墻后的地表沉降和圍護(hù)樁的水平變形逐漸減�。浑S著建筑物荷載的變大,墻后地表沉降和圍護(hù)樁的水平變形增加。隨著剛度的增大,建筑物下基坑的地表沉降逐漸減小,而圍護(hù)樁的水平變形隨著建筑物剛度的增大而增大。
[Abstract]:The excavation of deep foundation pit is usually located in the center of the city. This requires foundation pit support not only to meet the strength requirements, but also to meet the deformation requirements. The design concept of foundation pit is changed from strength control to deformation control. The deformation of foundation pit excavation will be different from that without building because of the existence of adjacent buildings. The main contents of this paper are as follows: 1. The present situation of foundation pit deformation and building deformation at home and abroad is summarized. The deformation mechanism and prediction method of foundation pit and the prediction method of building deformation are briefly summarized. 2. The FLAC3D 3D model is established, and the law of ground subsidence behind the wall of foundation pit excavation and the horizontal deformation law of retaining pile are analyzed. The deformation modes of the surface settlement behind the wall are all grooves, and the horizontal deformation modes of the retaining piles are "large in the middle and small in the ends". And the spatial effect of foundation pit is analyzed. The surface settlement behind the wall of foundation pit and the horizontal deformation of retaining pile have obvious corner effect. The closer the foundation pit is to the corner, the smaller the deformation value is. 3. The diameter of pile is studied. The influence of pile spacing and horizontal spacing of anchor cables on foundation pit deformation. With the increase of pile diameter, the soil surface settlement and the horizontal deformation of retaining pile decrease gradually, and with the increase of pile spacing or anchor cable horizontal spacing, The soil surface settlement and the horizontal deformation of the retaining pile increase gradually behind the wall of the short and short sides of the foundation pit. 4. The three-dimensional deformation law of the excavation of the foundation pit near the building is studied. The influence of the existence of the building on the surface settlement behind the wall and the horizontal deformation of the retaining pile is analyzed. It is found that when there is a building, the surface settlement behind the foundation pit wall is still grooved, but at the boundary of the building, the slope of the settlement curve is abrupt, and the maximum settlement of the building does not occur in the soil under the building. Compared with the deformation law of foundation pit under overload, it is found that the surface settlement behind the wall under the action of building is smaller than that of foundation pit under overload, but the horizontal deformation of retaining pile is smaller than that of foundation pit under overload. 5. The distance of building is analyzed. The influence of load and stiffness on foundation pit deformation. It is found that the surface settlement behind the wall and the horizontal deformation of the retaining pile gradually decrease with the increase of the building distance from the side of the foundation pit, and the surface settlement and the horizontal deformation of the retaining pile increase with the increase of the building load. With the increase of stiffness, the ground settlement of foundation pit decreases gradually, while the horizontal deformation of retaining pile increases with the increase of building stiffness.
【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】：2014
【分類號】：TU753

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 袁海峰;鄭剛;;鄰近建筑物受基坑開挖影響有限元分析[J];低溫建筑技術(shù);2006年03期

2 楊國偉;趙以奇;劉建航;;無超載時圍護(hù)結(jié)構(gòu)水平位移與墻后地表位移關(guān)系研究[J];地下工程與隧道;2001年03期

3 楊國偉,劉建航;鄰近建筑物或地面超載作用下圍護(hù)結(jié)構(gòu)水平位移與坑周地表沉降關(guān)系研究[J];地下工程與隧道;2002年03期

4 應(yīng)惠清;深基坑圍護(hù)結(jié)構(gòu)位移的估算及其控制[J];結(jié)構(gòu)工程師;1996年01期

5 徐中華;王建華;王衛(wèi)東;;上海地區(qū)深基坑工程中地下連續(xù)墻的變形性狀[J];土木工程學(xué)報;2008年08期

6 李淑;張頂立;房倩;盧偉;;北京地鐵車站深基坑地表變形特性研究[J];巖石力學(xué)與工程學(xué)報;2012年01期

7 劉興旺,施祖元,益德清,吳世明;軟土地區(qū)基坑開挖變形性狀研究[J];巖土工程學(xué)報;1999年04期

8 賈堤;石峰;鄭剛;徐舜華;安璐;;深基坑工程數(shù)值模擬土體彈性模量取值的探討[J];巖土工程學(xué)報;2008年S1期

9 崔玖江;北京地鐵新線工程概況暨建設(shè)特點、難點、管理要點[J];現(xiàn)代城市軌道交通;2004年01期

10 李淑;張頂立;房倩;李志佳;;北京地區(qū)深基坑墻體變形特性研究[J];巖石力學(xué)與工程學(xué)報;2012年11期

相關(guān)博士學(xué)位論文 前2條

1 李志高;地下綜合體深基坑施工環(huán)境影響及保護(hù)研究[D];同濟(jì)大學(xué);2006年

2 李淑;基于變形控制的北京地鐵車站深基坑設(shè)計方法研究[D];北京交通大學(xué);2013年

，

本文編號：2010923