本文關(guān)鍵詞： 深基坑 有限元 地下連續(xù)墻 歷史風(fēng)貌建筑 基礎(chǔ) 地面沉降 傾斜值　出處：《河北工業(yè)大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：本文針對天津市某基坑工程開挖是否會對周圍鄰近歷史風(fēng)貌建筑產(chǎn)生不良影響這一問題，依據(jù)現(xiàn)場中的實(shí)測數(shù)據(jù)結(jié)果，采用有限元軟件ABAQUS，對三維基坑變形性狀進(jìn)行研究。實(shí)際監(jiān)測和計(jì)算模擬結(jié)果表明： 1.監(jiān)測的支撐軸力大多數(shù)為正，承受壓力，第一道支撐內(nèi)力相比其余幾道內(nèi)力大，隨著開挖深度增加支撐內(nèi)力逐漸減小。支撐水平位移普遍向基坑內(nèi)移動，且第一道支撐的位移值最大，隨著開挖深度增加支撐位移值逐漸減小。 2.監(jiān)測的地連墻水平位移向基坑內(nèi)移動，由于東面和北面墻體早已作為其他基坑支護(hù)結(jié)構(gòu)，變形較小，中心附近水平位移分別為0和10mm以下。另兩面墻體變形較大接近100mm。模擬的西面和南面墻體水平位移變化趨勢和監(jiān)測結(jié)果吻合，隨著埋深的變化墻體位移呈現(xiàn)倒三角式變化趨勢，與監(jiān)測結(jié)果吻合。同一深度處地連墻中間處位移值比四角處大。 3.監(jiān)測的基礎(chǔ)沉降在開挖后大部分為0，只有11、12點(diǎn)沉降值為0.01mm。模擬的位移離基坑越近，其數(shù)值越大，越遠(yuǎn)其數(shù)值越小，最大和最小沉降值分別為0.0178m和0.0033m。模擬的基礎(chǔ)主拉應(yīng)力四角處相比中間而言數(shù)值較小，但總體分布數(shù)值不大。局部傾斜值均小于規(guī)范中的允許值0.002，滿足規(guī)范的要求。 分析結(jié)果認(rèn)為： 1.對深基坑進(jìn)行現(xiàn)場監(jiān)測，分析各項(xiàng)監(jiān)測內(nèi)容的變化規(guī)律，對鄰近歷史風(fēng)貌建筑基礎(chǔ)變形規(guī)律進(jìn)行了預(yù)測，指出動態(tài)監(jiān)測在保障安全施工中發(fā)揮著重要作用。由結(jié)果看出可以忽略基坑開挖對基礎(chǔ)變形造成的影響。 2.對基礎(chǔ)在基坑分步開挖過程中的反應(yīng)進(jìn)行分析研究，將實(shí)測結(jié)果和有限元分析結(jié)果進(jìn)行對比，變形規(guī)律基本一致，，說明ABAQUS可以用于基坑工程，并指導(dǎo)基坑設(shè)計(jì)和施工。基坑工程用三維有限元分析能夠得到和實(shí)際測量接近的結(jié)果 本文的得分析結(jié)果可以用于基坑工程的變形計(jì)算及對鄰近建筑物產(chǎn)生的影響預(yù)估。
[Abstract]:This paper aims at the question whether the excavation of a foundation pit in Tianjin will have a bad effect on the surrounding historical buildings, and according to the measured data in the field, The finite element software Abaqus is used to study the deformation behavior of three-dimensional foundation pit. The actual monitoring and simulation results show that:. 1. Most of the supporting axial forces monitored are positive, bearing the pressure. The first bracing internal force is larger than the other several internal forces, and gradually decreases with the increase of excavation depth. The horizontal displacement of the bracing generally moves to the foundation pit. The displacement value of the first bracing is the largest and decreases gradually with the increase of excavation depth. 2. The horizontal displacement of the monitored ground connection wall moves to the foundation pit. As the east and north walls have already been used as other foundation pit supporting structures, the deformation is relatively small. The horizontal displacement near the center is below 0 and 10 mm, respectively. The deformation of the other two walls is close to 100mm. the horizontal displacement of the west and south wall is consistent with the monitoring results, and the displacement of the wall shows a trend of inverted triangle with the change of the buried depth. The results are in agreement with the monitoring results. At the same depth, the displacement value of the middle part of the connecting wall is larger than that of the four corners. 3. The monitored foundation settlement is mostly 0 after excavation, and only the settlement value of 11 ~ 12 points is 0.01mm. the closer the simulated displacement is to the foundation pit, the greater its value is and the smaller its value is. The maximum and minimum settlement values are 0.0178m and 0.0033mrespectively. Compared with the center of the four corners of the basic principal tensile stress, the simulated values are smaller than the values of the total distribution, and the local tilting values are smaller than the allowable values of 0.002 in the code, which meet the requirements of the code. The results of the analysis show that:. 1. The field monitoring of deep foundation pit is carried out, and the variation law of each monitoring content is analyzed, and the deformation law of adjacent historic buildings is forecasted. It is pointed out that dynamic monitoring plays an important role in ensuring safe construction, and the influence of excavation on foundation deformation can be neglected from the results. 2. The response of foundation in the process of excavation by steps is analyzed and studied. The measured results are compared with the results of finite element analysis, and the deformation law is basically the same. It shows that ABAQUS can be used in foundation pit engineering. And guide the design and construction of foundation pit. Three-dimensional finite element analysis for foundation pit engineering can get results close to actual measurement. The results obtained in this paper can be used to calculate the deformation of foundation pit and predict the influence on adjacent buildings.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU433

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