本文關鍵詞：不同加固方式對深基坑變形影響的數(shù)值分析　出處：《天津大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 坑底加固 深基坑 基坑變形 數(shù)值分析 修正劍橋模型

【摘要】：隨著我國城鎮(zhèn)化建設進程的加快,基坑工程的規(guī)模越來越大,若基坑設計不合理,會影響基坑的穩(wěn)定性及其周圍環(huán)境的安全和正常使用�？拥准庸炭梢愿纳仆馏w的物理力學參數(shù),抑制基坑的變形,增強基坑的穩(wěn)定性,但其費用較高,因此,確定合理的加固范圍、選擇合適的加固方式及其組合十分重要。本文運用有限元軟件ABAQUS建立三維彈塑性模型,模擬了深基坑內(nèi)坑底加固對基坑變形的影響,討論了坑底加固不同影響因素及不同坑底加固方式對坑底隆起和圍護結(jié)構(gòu)側(cè)向位移的影響,并探討了(坑底加固+工程樁)對基坑變形的影響,得出了一些結(jié)論和規(guī)律,主要的研究內(nèi)容和成果如下:1、分析了加固體剛度、寬度、位置變化等影響因素對坑底隆起和圍護結(jié)構(gòu)側(cè)向位移的影響,結(jié)果表明:坑底隆起和圍護結(jié)構(gòu)的側(cè)向位移隨加固體剛度、寬度的增大而減小,但存在一個合理的加固范圍;基坑變形隨加固體離坑底距離的增大而增大,坑底土體應從坑底開挖面處開始加固。2、討論了滿堂、裙邊、抽條、格柵等四種不同加固方式對坑底隆起和圍護結(jié)構(gòu)側(cè)向位移的影響,結(jié)果表明:在抑制坑底隆起的效果上,由大到小依次是滿堂、格柵、抽條、裙邊加固,裙邊加固可以有效提高加固范圍之內(nèi)土體的抗隆起作用;在抑制最大側(cè)向位移的效果上,四種不同加固方式相差不大。3、探討了滿堂加固、工程樁、(滿堂加固+工程樁)、(裙邊加固+工程樁)這四種不同加固方式對基坑變形的影響,結(jié)果表明:在抑制坑底隆起的效果上,由大到小依次是(滿堂加固+工程樁)、(裙邊加固+工程樁)、工程樁、滿堂加固;工程樁對抑制圍護結(jié)構(gòu)側(cè)向位移的作用要小一些,而其他三種不同加固方式在抑制最大側(cè)向位移的效果上相差不大。4、對于不同地區(qū)的工程地質(zhì)條件和基坑變形的控制要求,使用合理的加固方式以及不同加固方式的組合,不僅可以保證基坑的安全和環(huán)境影響的要求,而且還可以降低成本。5、通過對實際的基坑工程進行模擬計算分析,得出有限元模擬值與計算值、實測值基本吻合,驗證了有限元模型的合理性以及數(shù)值模擬分析所得的規(guī)律的正確性。
[Abstract]:With the process of China's urbanization accelerated, increasing the size of the foundation pit design, if not reasonable, will affect the stability of the foundation pit and the surrounding environment safety and normal use. Foundation reinforcement can improve the physical and mechanical parameters of soil deformation, inhibition of foundation pit, foundation stability enhancement, but its high cost, therefore sure, the reasonable reinforcement scope, select the appropriate reinforcement and combination is very important. This paper uses finite element software ABAQUS to establish three-dimensional elastoplastic model, simulation of the deep foundation pit of foundation reinforcement effect on the deformation of foundation pit, the influence of different factors and different foundation reinforcement foundation reinforcement in displacement and lateral heave retaining structure the discussion, and discussed the (+ pile foundation reinforcement engineering) the influence of pit deformation, draws some conclusions and rules, the main research contents and results are as follows: 1 points. Analysis of the solid stiffness, width, impact, influence of location changes on the heave and displacement of retaining structure. The results showed that the lateral displacement and heave retaining structure with solid stiffness, width increases, but there is a reasonable range of deformation of foundation pit reinforcement; with the increase of solid increases from the bottom distance increases, the bottom soil from the excavation surface at the beginning of reinforcement.2, discusses the full skirt, pumping, influence, grid four different reinforcement method of heave and displacement of retaining structure. The results showed that: in the suppression of lateral uplift effect, from large to small in turn is full, grille pumping, skirt, skirt reinforcement, reinforcement can effectively improve the range of soil heave reinforcement; in the suppression of the maximum lateral displacement effect, four different reinforcement has little difference with.3, discusses the full reinforcement engineering Cheng (full pile, reinforcement engineering pile, (+) + skirt reinforcement engineering pile) these four different ways of strengthening the results show that the influence of the deformation of foundation pit in inhibiting uplift effect, from large to small in turn is (a + pile reinforcement (reinforcement), skirt + pile), engineering the role of engineering pile, reinforcement; pile retaining structure on the inhibition of lateral displacement is smaller, while the other three kinds of reinforcement has little difference in the inhibition of the maximum lateral displacement of the.4 effect, for the control of different parts of the engineering geological conditions and deformation requirements, reasonable use of reinforcement method and combination of different ways of strengthening. Not only can guarantee the safety and environmental impact of excavation requirements, but also can reduce the cost of.5 was simulated through the analysis of the actual excavation engineering, the finite element simulation and calculated values and measured values coincide, verify the Co. The reasonableness of the metamodel and the correctness of the numerical simulation analysis.

【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU753

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