【摘要】：地基基礎(chǔ)是建筑物的根基,必須保證足夠的承載能力和穩(wěn)定性。工程上計算地基承載力通常采用普朗特地基承載力公式出發(fā)進行修正的方法,但對于非對稱超載作用下條形基礎(chǔ)地基極限承載力的計算并不適用,現(xiàn)行規(guī)范有明確的計算公式,但是簡化為對稱超載作用進行計算的。因此開展適合非對稱埋深地基工程特點的破壞模式和承載力計算方法研究,具有重要的理論意義和工程實踐意義。本文的主要工作和結(jié)論如下:(1)首先回顧了國內(nèi)外地基承載力計算的發(fā)展和研究現(xiàn)狀,介紹了地基極限承載力和地基破壞模式的基本概念,推導(dǎo)了經(jīng)典地基極限承載力的計算方法,為進一步計算非對稱埋深作用地基極限承載力奠定理論基礎(chǔ)。(2)采用極限平衡分析方法對非對稱埋深條形基礎(chǔ)地基的極限承載力進行研究。結(jié)合條形基礎(chǔ)破壞機理,借鑒對稱埋深地基破壞模式,考慮非對稱埋深作用下地基破壞的非對稱性,構(gòu)建出非對稱埋深條形基礎(chǔ)地基的合理破壞模型。通過該模型上受力分析,采用極限平衡分析方法,分別計算僅考慮基礎(chǔ)埋深、土的黏聚力影響下地基極限承載力公式和僅考慮土體自重影響下地基極限承載力公式,綜合兩個公式,推導(dǎo)出非對稱埋深作用并考慮土重的條形基礎(chǔ)地基極限承載力計算方法。通過案例分析,得出條形基礎(chǔ)在非對稱埋深下承載力系數(shù)隨一側(cè)埋深的增加而變小,但地基極限承載力隨兩側(cè)埋深之和的增加而增大。(3)采用有限元分析軟件PLAXIS對非對稱埋深地基破壞形狀和承載力進行數(shù)值分析,分析基礎(chǔ)兩側(cè)在不同埋深下地基的變形網(wǎng)格和極限承載力的變化,并與理論計算結(jié)果進行了比較與討論。數(shù)值模擬所得地基極限承載力變化規(guī)律與理論計算結(jié)果規(guī)律基本一致。
[Abstract]:The foundation is the foundation of the building, it must ensure sufficient bearing capacity and stability. The formula of Plantt foundation bearing capacity is usually used to modify the foundation bearing capacity in engineering, but it is not applicable to the calculation of ultimate bearing capacity of strip foundation under asymmetric overload, and the current code has a clear formula for calculating the ultimate bearing capacity of strip foundation. But the calculation is simplified to symmetric overload action. Therefore, it is of great theoretical and practical significance to study the failure mode and bearing capacity calculation method suitable for the characteristics of asymmetric buried foundation engineering. The main work and conclusions are as follows: (1) the development and research status of foundation bearing capacity at home and abroad are reviewed, and the basic concepts of ultimate bearing capacity and failure mode of foundation are introduced. The calculation method of the ultimate bearing capacity of the foundation is deduced. It lays a theoretical foundation for further calculation of ultimate bearing capacity of asymmetric buried deep foundation. (2) the ultimate bearing capacity of asymmetric buried deep strip foundation is studied by using limit equilibrium analysis method. Based on the failure mechanism of strip foundation and the failure mode of symmetrical buried deep foundation and considering the asymmetry of foundation failure under asymmetric buried depth, a reasonable failure model of asymmetric buried deep strip foundation is established. Through the stress analysis on the model and the limit equilibrium analysis method, the formula of ultimate bearing capacity of foundation considering only the depth of foundation and the cohesive force of soil is calculated, and the formula of ultimate bearing capacity of foundation considering only the influence of soil gravity is calculated. Based on two formulas, the calculation method of ultimate bearing capacity of strip foundation considering soil weight and asymmetric burying depth is deduced. Through the case analysis, it is concluded that the bearing capacity coefficient of strip foundation decreases with the increase of the depth of one side under asymmetric burying depth. However, the ultimate bearing capacity increases with the increase of the sum of buried depth on both sides. (3) numerical analysis of failure shape and bearing capacity of asymmetric buried foundation is carried out by using finite element analysis software PLAXIS. The variation of deformation mesh and ultimate bearing capacity of both sides of the foundation under different buried depths are analyzed and compared with the theoretical calculation results. The variation law of ultimate bearing capacity obtained by numerical simulation is basically consistent with the law of theoretical calculation.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU470

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本文編號：2239971