發(fā)布時間：2018-04-22 06:18

  本文選題：基坑工程 + 預(yù)應(yīng)力錨索支護(hù)體系�。� 參考：《遼寧師范大學(xué)》2013年碩士論文

【摘要】：隨著社會經(jīng)濟(jì)的飛速發(fā)展，城市建筑趨向高層化，地下空間需要充分開發(fā)和利用。地下室由一層增加到多層，相應(yīng)基坑的開挖深度也增大到地表以下幾十米，由此，在城市中產(chǎn)生了大量的基坑工程。基坑工程作為整個工程的基礎(chǔ)，直接影響到主體工程的安全、進(jìn)度及質(zhì)量，這就需要采取相應(yīng)的措施來加固基坑，以保證整個工程的順利完成。 目前，預(yù)應(yīng)力錨索在基坑加固過程中的計算理論和方法還停留在剛性理論的極限平衡法，對基坑邊坡的變形機(jī)理認(rèn)識不夠，將基坑側(cè)壁當(dāng)作剛體考慮而不是變形體，同時依靠實踐經(jīng)驗來分析和設(shè)計。如今，數(shù)值模擬技術(shù)的不斷發(fā)展，為基坑支護(hù)工程的分析與設(shè)計提供了一條新的途徑。 本文依據(jù)具體工程實例，采用理正穩(wěn)定性分析軟件和FLAC3D軟件兩種不同工具分別對基坑支護(hù)工程的C’-D段進(jìn)行模擬、分析；再將現(xiàn)場實際測量的數(shù)據(jù)進(jìn)行整理，最后將三者的計算結(jié)果進(jìn)行對比分析，進(jìn)而更加準(zhǔn)確的分析基坑邊坡的穩(wěn)定性，驗證設(shè)計方案的可行性和正確性。 本文的具體內(nèi)容如下： （1）概述了基坑工程在國內(nèi)的發(fā)展?fàn)顩r及預(yù)應(yīng)力錨索在基坑加固中的作用及原理； （2）分析和總結(jié)土壓力的計算理論，給出各個計算理論的適用條件，為以后的軟件計算奠定理論基礎(chǔ)； （3）簡單介紹了FLAC3D的基本原理及應(yīng)用范圍，特別對其錨索單元的模擬作了詳細(xì)的介紹； （4）運用理正穩(wěn)定性分析軟件對基坑C’-D段進(jìn)行計算，得出設(shè)計方案，并且對照相關(guān)規(guī)范，驗證該設(shè)計是否具有可行性； （5）在理正穩(wěn)定性分析軟件計算基礎(chǔ)上，采用FLAC3D軟件對基坑C’-D段進(jìn)行兩次不同的（支護(hù)前、后）三維數(shù)值模擬，直觀、準(zhǔn)確的反映出基坑內(nèi)部介質(zhì)的受力及位移變化情況，，體現(xiàn)出預(yù)應(yīng)力錨索支護(hù)體系在基坑加固中所起到的作用； （6）結(jié)合現(xiàn)場監(jiān)測的數(shù)據(jù)，將FLAC3D的計算結(jié)果、理正軟件的計算結(jié)果和現(xiàn)場實測數(shù)據(jù)進(jìn)行對比分析，從而驗證FLAC3D數(shù)值模擬的正確性和有效性，為今后的工程設(shè)計和施工提供有價值的參考。
[Abstract]:With the rapid development of social economy, urban buildings tend to be high-rise, and underground space needs to be fully developed and utilized. The basement has been increased from one floor to many layers, and the excavation depth of the corresponding foundation pit has increased to several tens of meters below the surface of the earth, thus, a large number of foundation pit projects have been produced in the city. As the foundation of the whole project, the foundation pit engineering directly affects the safety, progress and quality of the main project. Therefore, it is necessary to take appropriate measures to strengthen the foundation pit to ensure the smooth completion of the whole project. At present, the calculation theory and method of prestressed anchor cable in the course of foundation pit reinforcement still remain in the limit equilibrium method of rigid theory, the deformation mechanism of foundation pit slope is not well understood, and the side wall of foundation pit is considered as rigid body instead of deformable form. At the same time rely on practical experience to analyze and design. Nowadays, the development of numerical simulation technology provides a new way for the analysis and design of foundation pit support engineering. In this paper, according to the concrete engineering examples, the Ca-D section of the foundation pit support engineering is simulated and analyzed by two different tools, namely, the straightening stability analysis software and the FLAC3D software, and then the actual data of the field measurement are sorted out. Finally, the calculation results are compared and analyzed, and the stability of foundation pit slope is analyzed more accurately to verify the feasibility and correctness of the design scheme. The details of this paper are as follows: 1) the development status of foundation pit engineering in China and the function and principle of prestressed anchor cable in foundation pit reinforcement are summarized. 2) analyzing and summing up the calculation theory of earth pressure, giving the applicable conditions of each calculation theory, and laying a theoretical foundation for the later calculation of software; The basic principle and application scope of FLAC3D are briefly introduced, especially the simulation of anchor cable element is introduced in detail. 4) calculate the Ca-D section of foundation pit by using the software of Li-positive stability analysis, obtain the design scheme, and verify the feasibility of the design compared with the relevant codes. Based on the calculation of rational positive stability analysis software, FLAC3D software is used to carry out two different three-dimensional numerical simulations of Ca-D section of foundation pit (before and after support), which can directly and accurately reflect the change of stress and displacement of the inner medium of foundation pit. The function of prestressed anchor cable support system in foundation pit reinforcement is reflected. In order to verify the correctness and validity of the FLAC3D numerical simulation, the FLAC3D calculation results, the calculation results of the straightening software and the field measured data are compared and analyzed in combination with the field monitoring data. To provide valuable reference for future engineering design and construction.
【學(xué)位授予單位】：遼寧師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU470

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本文編號：1785970