【摘要】：近年來(lái)我國(guó)各城市的地鐵建設(shè)如火如荼,伴隨而來(lái)的深基坑工程的安全性研究就顯得尤為重要,如今數(shù)值模擬等軟件的應(yīng)用對(duì)地鐵建設(shè)起到了直接的指導(dǎo)作用。本文簡(jiǎn)要的概括了基坑工程的發(fā)展現(xiàn)狀,并且總結(jié)了基坑工程的幾種主要支護(hù)類型,通過(guò)對(duì)比介紹了各個(gè)類型的優(yōu)缺點(diǎn),為下面的支護(hù)形式的選取做了準(zhǔn)備。另外簡(jiǎn)單說(shuō)明了深基坑設(shè)計(jì)的一些計(jì)算理論和優(yōu)選理論,以及基坑設(shè)計(jì)的一般的原則。接著結(jié)合杭州城站站工程實(shí)際,介紹了工程的水文、地質(zhì)條件,通過(guò)多目標(biāo)決策模糊理論,選擇最為合適的支護(hù)形式,再利用軟件設(shè)計(jì)支護(hù)結(jié)構(gòu)并進(jìn)行有限元驗(yàn)算。對(duì)選取的工程實(shí)例的基坑支護(hù)結(jié)構(gòu)形式作出了優(yōu)選并對(duì)支護(hù)的細(xì)部構(gòu)造進(jìn)行了研究。根據(jù)施工的現(xiàn)場(chǎng)情況與設(shè)計(jì)結(jié)果將其分為若干工況,運(yùn)用大型有限元軟件Plaxis建立模型,模擬基坑開(kāi)挖過(guò)程并進(jìn)行計(jì)算,將計(jì)算結(jié)果進(jìn)行比較,對(duì)支護(hù)結(jié)構(gòu)周圍土體的沉降情況進(jìn)行研究,驗(yàn)證了優(yōu)選得出的基坑支護(hù)形式的安全性。本文中根據(jù)最終的數(shù)值模擬的結(jié)果,將設(shè)計(jì)值、模擬值以及監(jiān)測(cè)值進(jìn)行對(duì)比,由此可得出以下幾點(diǎn)成果:(1)根據(jù)杭州地鐵城站站的工程概況以及所處地區(qū)的工程地質(zhì),利用啟明星基坑分析計(jì)算軟件對(duì)該地鐵深基坑進(jìn)行支護(hù)結(jié)構(gòu)設(shè)計(jì),并對(duì)其進(jìn)行驗(yàn)算。根據(jù)設(shè)計(jì)的結(jié)果,進(jìn)行施工建造,并在施工期間嚴(yán)格按照標(biāo)準(zhǔn)進(jìn)行監(jiān)測(cè),對(duì)比監(jiān)測(cè)的結(jié)果發(fā)現(xiàn)設(shè)計(jì)值能滿足基坑的變形要求,說(shuō)明支護(hù)結(jié)構(gòu)的設(shè)計(jì)是合理可行的;(2)根據(jù)杭州城站站地鐵深基坑支護(hù)工程為例,采用PLAXIS 3D建模來(lái)對(duì)該深基坑的開(kāi)挖過(guò)程進(jìn)行模擬分析,得到該深基坑的位移、沉降、軸力的分布及變化規(guī)律;(3)將數(shù)值模擬的值與實(shí)際監(jiān)測(cè)得出的數(shù)值進(jìn)行對(duì)比,發(fā)現(xiàn)結(jié)果基本一致,證明了該基坑項(xiàng)目方案設(shè)計(jì)的合理性數(shù)值模擬的正確性;PLAXIS 2D/3D程序現(xiàn)在已廣泛應(yīng)用于各種復(fù)雜巖土工程項(xiàng)目的有限元分析中,同時(shí)數(shù)值模擬這種方法具有方便直觀、概念清晰、可操作性強(qiáng)而且不需耗費(fèi)大量資金等優(yōu)點(diǎn),在現(xiàn)在已經(jīng)成為一種主流趨勢(shì),將來(lái)也必將得到更多的發(fā)展應(yīng)用,本文依托這一方式得到的結(jié)果也為同類型的深基坑開(kāi)挖提供了一定的參考價(jià)值。
[Abstract]:In recent years, the construction of subway in various cities in China is very important, and the research on the safety of deep foundation pit engineering is especially important, and the application of software such as numerical simulation has played a direct role in the construction of subway. In this paper, the present situation of foundation pit engineering is summarized, and several main types of support are summarized, and the advantages and disadvantages of each type are introduced. In addition, some calculation theory and optimization theory of deep foundation pit design, as well as general principles of foundation pit design are briefly described. Combined with Hangzhou city station engineering practice, the hydrology and geological conditions of the project are introduced, the fuzzy theory of multi-objective decision-making is adopted, the most suitable supporting form is selected, and the software design support structure is utilized and the finite element calculation is carried out. The structural form of the foundation pit support for the selected project example is optimized and the detailed structure of the support is studied. According to the site situation and the design result of the construction, it is divided into several working conditions, the model is established by using the large-scale finite element software Plaxis, the excavation process of the foundation pit is simulated and the calculation is carried out, the calculation result is compared, the settlement condition of the surrounding soil surrounding the supporting structure is studied, the security of the preferred form of foundation pit support is verified. In this paper, according to the result of the final numerical simulation, the design value, the simulation value and the monitoring value are compared, and the following results can be obtained: (1) According to the engineering situation of Hangzhou Metro Station Station and the engineering geology in the area, The foundation pit analysis and calculation software is used to design the supporting structure of the deep foundation pit of the subway, and the checking calculation is carried out. According to the result of the design, the construction is carried out and monitored strictly according to the standard during the construction period. The result of the comparison monitoring finds that the design value can meet the deformation requirements of the foundation pit, and the design of the supporting structure is reasonable and feasible. (2) According to the support engineering of subway deep foundation pit in Hangzhou City Station Station, the excavation process of the deep foundation pit is simulated and analyzed by means of PLAXIS 3D modeling, and the distribution and variation law of the displacement, settlement and shaft force of the deep foundation pit are obtained. (3) comparing the value of the numerical simulation with the numerical value obtained by the actual monitoring, finding the correctness of the rationality numerical simulation of the project design of the foundation pit; and the PLAXIS 2D/ 3D program is now widely applied to the finite element analysis of various complex geotechnical engineering projects, meanwhile, the numerical simulation method has the advantages of convenience and intuition, clear concept, strong operability and no need to consume a large amount of funds and the like, The results obtained in this paper also provide some reference value for the excavation of the same type of deep foundation pit.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU753

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