【摘要】：隨著城市化的發(fā)展,地下工程特別是深基坑工程在城市中的應(yīng)用日益增多。為了解決遇到的新問(wèn)題,越來(lái)越多的工法相繼出現(xiàn),基坑工程的發(fā)展遠(yuǎn)遠(yuǎn)超越了其理論發(fā)展的程度。這些新穎的工法是否合理,如何在實(shí)踐應(yīng)用中保持基坑的安全和變形的合理控制與經(jīng)濟(jì)性之間的平衡,有必要進(jìn)行深入的研究。本文在前人對(duì)深基坑工程的研究的基礎(chǔ)上,分析了基坑開(kāi)挖過(guò)程中的變形機(jī)理,總結(jié)了基坑變形的自然因素、設(shè)計(jì)因素和施工因素。論文以北京地鐵8號(hào)線三期永定門(mén)外站深基坑工程為項(xiàng)目依托,通過(guò)分析該工程的地表沉降、地連墻水平位移和內(nèi)支撐軸力等現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù),得出地連墻+內(nèi)支撐結(jié)構(gòu)支護(hù)下的深基坑變形規(guī)律。研究了該工程中基坑變形的時(shí)空效應(yīng),分析了不同工況下基坑變形的特點(diǎn)。結(jié)合本工程的特殊性,本文分析了基坑水下開(kāi)挖和水下封底、坑內(nèi)水的抽排和回灌等多種新型工況下基坑的變形特性,得出了基坑水下開(kāi)挖的變形規(guī)律。利用Midas/GTS有限元數(shù)值模擬軟件對(duì)實(shí)際工程進(jìn)行了建模和分析,并將模擬結(jié)果與現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)進(jìn)行對(duì)比,驗(yàn)證了數(shù)值模擬的準(zhǔn)確性并且更加直觀的分析了該基坑的變形規(guī)律,通過(guò)數(shù)值模擬驗(yàn)證了分倉(cāng)墻對(duì)基坑變形顯著的約束作用。在驗(yàn)證數(shù)值模擬準(zhǔn)確的基礎(chǔ)上,利用數(shù)值模擬的手段,采用單變量分析法,對(duì)影響該基坑變形的各種因素進(jìn)行分析,研究了地連墻厚度、地連墻嵌固深度、分倉(cāng)墻布置形式對(duì)支護(hù)結(jié)構(gòu)變形的影響,并且為地連墻設(shè)計(jì)提出優(yōu)化建議;基于變形監(jiān)測(cè)對(duì)基坑內(nèi)土體m值進(jìn)行反分析,對(duì)設(shè)計(jì)參數(shù)提出優(yōu)化建議。
[Abstract]:With the development of urbanization, underground engineering, especially deep foundation pit engineering, is increasingly used in cities. In order to solve the new problems, more and more engineering methods have appeared one after another, and the development of foundation pit engineering has far exceeded its theoretical development. Whether these novel methods are reasonable or not and how to keep the balance between the safety and deformation of foundation pit and the economy of foundation pit in practice, it is necessary to carry on the thorough research. On the basis of previous researches on deep foundation pit engineering, this paper analyzes the deformation mechanism of foundation pit excavation, and summarizes the natural factors, design factors and construction factors of foundation pit deformation. Based on the deep foundation pit project of Yongdingmen Station in the third phase of Beijing Metro Line 8, the paper analyzes the site monitoring data such as ground subsidence, horizontal displacement of ground connection wall and internal support axial force. The deformation law of deep foundation pit is obtained under the support of ground-connected wall. The space-time effect of foundation pit deformation in this project is studied, and the characteristics of foundation pit deformation under different working conditions are analyzed. Combined with the particularity of this project, this paper analyzes the deformation characteristics of foundation pit under various new conditions, such as underwater excavation and bottom sealing, pumping and recharging of water in the pit, and obtains the deformation law of underwater excavation of foundation pit. Midas/GTS finite element numerical simulation software is used to model and analyze the actual engineering, and the simulation results are compared with the field monitoring data. The accuracy of the numerical simulation is verified and the deformation law of the foundation pit is analyzed more intuitively. Numerical simulation is used to verify the significant restraint effect of the partition wall on foundation pit deformation. On the basis of verifying the accuracy of numerical simulation, using the method of numerical simulation and single variable analysis, various factors affecting the deformation of the foundation pit are analyzed, and the thickness of the ground connecting wall and the depth of the embedded wall are studied. The influence of the wall layout on the deformation of the supporting structure and the optimization suggestions for the design of the ground connecting wall are put forward. Based on deformation monitoring, the m value of soil in foundation pit is back analyzed, and some suggestions for optimization of design parameters are put forward.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U231.3;TU473.2

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