本文關(guān)鍵詞： 地基基礎(chǔ) 加固 方案選擇 對比分析 數(shù)值模擬　出處：《合肥工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來，隨著經(jīng)濟的飛速發(fā)展，城市中原來的低層建筑，諸如住宅，辦公樓等，已經(jīng)無法滿足目前生產(chǎn)和生活的需要。而且土地資源正在日漸減少，因此，對舊房屋進行加層改造成為使這些建筑物繼續(xù)發(fā)揮其功能的重要手段，這種做法既節(jié)約了資源又可以在一定程度上緩解用房緊張的問題，有著廣闊的應(yīng)用前景。所以需要對這些建筑物進行擴建、加層以及加固改造。 而在實際中的許多工程中，往往都是重視上部結(jié)構(gòu)的加固處理，而對地基基礎(chǔ)的加固處理不予以重視，造成在實際的使用中引起地基基礎(chǔ)的不均勻沉降，影響了建筑物的安全使用。因此，對實際的工程，研究有效的地基基礎(chǔ)加固處理方案，具有重要的理論意義和實用價值。 本文在已有的地基基礎(chǔ)加固改造技術(shù)研究成果的基礎(chǔ)上，歸納總結(jié)了各種不同的地基基礎(chǔ)加固方法的優(yōu)缺點及其適用范圍，并且針對合肥某高校教學(xué)樓家加層加固的實際工程，先初步確定幾種加固方法。 確定加固方法之后，通過理論計算，在滿足地基承載力的條件下對每一種方法提出若干種方案，并且運用Midas/GTS有限元分析軟件對該工程的工程地質(zhì)和加固前后的沉降情況進行模擬。 本次分析研究共三個基礎(chǔ)加固方法，包含16個小方案，通過Midas/GTS軟件依次進行模擬，通過對地基位移圖的分析、承載力的校核、基礎(chǔ)沉降數(shù)據(jù)的采集，最后將得到的數(shù)據(jù)進行不同類別的分析對比，結(jié)合實際的因素最終選出最適合本工程的加固方法。 通過以上的研究表明，本工種采用方形混凝土預(yù)制樁和圓形開口鋼管樁，改變樁長對加固后的效果影響比較大，改變樁徑和樁邊長雖然提高樁的極限承載力，但是提高的承載力并沒有全部發(fā)揮。如采用擴大基礎(chǔ)的方法，增加基礎(chǔ)尺寸，加固效果均有提升，但是當(dāng)基礎(chǔ)尺寸達到一定值時，加固效果的提升不明顯。 上述研究的成果對既有建、構(gòu)筑物地基基礎(chǔ)加固處理方案的研究，，將對類似工程的地基基礎(chǔ)加固處理有一定的參考價值。
[Abstract]:In recent years, with the rapid development of economy, the original low-rise buildings in cities, such as housing, office buildings, have been unable to meet the needs of production and living. The addition of storeys to old houses has become an important means for these buildings to continue to perform their functions, which not only saves resources but also alleviates the shortage of housing to a certain extent. These buildings need to be expanded, storied and reinforced. In many practical projects, the reinforcement of the superstructure is often attached importance to, but the reinforcement of the foundation is not attached importance to, resulting in the actual use of uneven settlement of the foundation. Therefore, it is of great theoretical significance and practical value to study the effective foundation reinforcement scheme for practical engineering. Based on the existing research results of foundation reinforcement and reconstruction technology, this paper summarizes the advantages and disadvantages of different foundation reinforcement methods and their applicable scope. In view of the practical project of strengthening a teaching building in Hefei, several reinforcement methods are preliminarily determined. After the reinforcement method is determined, through theoretical calculation, several schemes are proposed for each method under the condition of satisfying the bearing capacity of the foundation. Midas/GTS finite element analysis software is used to simulate the engineering geology and settlement before and after reinforcement. This analysis and study of three foundation reinforcement methods, including 16 small projects, through the Midas/GTS software in turn to simulate, through the analysis of the foundation displacement map, the bearing capacity of the check. Finally, the data of foundation settlement are collected, and the data are analyzed and compared in different categories. Finally, the reinforcement method that is most suitable for this project is selected according to the actual factors. According to the above research, square concrete prefabricated pile and circular open steel pipe pile are adopted in this work. Changing the length of pile has a great effect on the effect of reinforcement, and changing the diameter and side length of pile can improve the ultimate bearing capacity of pile. However, the improved bearing capacity is not given full play. If the method of expanding foundation is adopted, the reinforcement effect can be improved by increasing the size of foundation, but when the size of foundation reaches a certain value, the improvement of reinforcement effect is not obvious. The results mentioned above will be of some reference value to the study of foundation reinforcement schemes of existing structures and structures, and will be helpful to the foundation strengthening and treatment of similar projects.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU753.8

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