条形基础下临坡地基极限承载力研究

发布时间：2018-05-13 10:22

本文选题：临坡地基 + 地基极限承载力　；参考：《西安理工大学》2017年硕士论文

【摘要】：在工程建设领域中,经常要将建筑物基础放置在临坡地基(位于坡顶且靠近坡面的地基)或者斜坡地基上,但是现有的临坡及斜坡地基极限承载力的计算方法并没有跟上实际工程的需求。在现行规范和科研成果中,关于如何确定临坡及斜坡地基极限承载力的方法尚无统一认识,因此提出更精确且适用的临坡及斜坡地基极限承载力的计算公式意义重大。本文采用极限平衡法和极限分析法得到了条形基础下临坡地基极限承载力的计算公式并进行了验证,为计算临坡及斜坡地基极限承载力提供了新思路。主要内容包括以下几个方面:(1)分析了前人提出的众多破坏模式的优缺点,在此基础上提出了更合理的计算临坡及斜坡地基极限承载力的破坏模式,并根据该破坏模式建立了临坡地基极限承载力的计算模型。(2)根据上述计算理论和计算模型,分别使用极限平衡法和极限分析法推导了条形基础下临坡地基极限承载力的计算公式。进而使用自编程序进行了计算,并分析了众多影响因素与三个承载力系数(N?、qN、CN)之间的关系。(3)将极限平衡法所得结果与极限分析法以及认可度较高的Saran结果进行了比较,分析了三者之间的误差及产生误差的原因。经过对比可认定,本文所得的计算公式便于在工程实际中使用,且精度相对较高,具有较高的参考价值及理论意义。(4)基于ABAQUS有限元软件,计算分析了条形基础下临坡地基到达极限状态时的破坏模式,获得了临坡地基极限承载力的有限元解,并与前文中的计算模型和计算结果进行对照分析,从而对本文采用的理论基础和计算公式的正确性进行了验证。同时,系统地分析了地基土内摩擦角、边坡角、相对临坡距、相对埋深、相对斜坡高度等因素对条形基础下临坡地基极限承载力的影响。
[Abstract]:In the field of engineering and construction, it is often necessary to place the foundation of the building on the base near the slope (which is located at the top of the slope and near the slope) or on the foundation of the slope. However, the existing methods for calculating the ultimate bearing capacity of slope and slope foundation have not kept up with the demand of practical engineering. In the current code and scientific research results, there is no unified understanding on how to determine the ultimate bearing capacity of slope and slope foundation, so it is of great significance to put forward a more accurate and applicable formula for calculating the ultimate bearing capacity of adjacent slope and slope foundation. In this paper, the limit equilibrium method and the limit analysis method are used to obtain the calculation formula of the ultimate bearing capacity of the adjacent slope foundation on the strip foundation, which provides a new way of thinking for the calculation of the ultimate bearing capacity of the adjacent slope foundation and the slope foundation. The main contents include the following aspects: 1) analyzing the advantages and disadvantages of many failure modes put forward by predecessors, and then putting forward a more reasonable failure mode to calculate the ultimate bearing capacity of slope and slope foundation. According to the failure mode, the calculation model of ultimate bearing capacity of the subgrade near the slope is established. (2) according to the above calculation theory and model, The limit equilibrium method and the limit analysis method are used to derive the calculation formulas of the ultimate bearing capacity of the subgrade on the strip foundation. Furthermore, the self-compiled program is used to calculate and analyze the relationship between many influencing factors and the three bearing capacity coefficients. (3) the results obtained by the limit equilibrium method are compared with the results obtained by the limit analysis method and the Saran results with higher recognition. The errors between them and the causes of the errors are analyzed. Through comparison, it can be concluded that the calculation formula obtained in this paper is convenient to be used in engineering practice and has relatively high precision, which has higher reference value and theoretical significance. (4) based on ABAQUS finite element software, In this paper, the failure mode of the adjacent slope foundation is calculated and analyzed when it reaches the limit state. The finite element solution of the ultimate bearing capacity of the adjacent slope foundation is obtained, and compared with the previous calculation model and calculation results. Thus, the correctness of the theoretical basis and calculation formula used in this paper is verified. At the same time, the influence of internal friction angle, slope angle, relative adjacent slope distance, relative buried depth and relative slope height on the ultimate bearing capacity of subgrade on strip foundation are analyzed systematically.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU470

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