本文選題：臨坡地基 + 地基極限承載力�。� 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：在工程建設(shè)領(lǐng)域中,經(jīng)常要將建筑物基礎(chǔ)放置在臨坡地基(位于坡頂且靠近坡面的地基)或者斜坡地基上,但是現(xiàn)有的臨坡及斜坡地基極限承載力的計(jì)算方法并沒有跟上實(shí)際工程的需求。在現(xiàn)行規(guī)范和科研成果中,關(guān)于如何確定臨坡及斜坡地基極限承載力的方法尚無統(tǒng)一認(rèn)識,因此提出更精確且適用的臨坡及斜坡地基極限承載力的計(jì)算公式意義重大。本文采用極限平衡法和極限分析法得到了條形基礎(chǔ)下臨坡地基極限承載力的計(jì)算公式并進(jìn)行了驗(yàn)證,為計(jì)算臨坡及斜坡地基極限承載力提供了新思路。主要內(nèi)容包括以下幾個方面:(1)分析了前人提出的眾多破壞模式的優(yōu)缺點(diǎn),在此基礎(chǔ)上提出了更合理的計(jì)算臨坡及斜坡地基極限承載力的破壞模式,并根據(jù)該破壞模式建立了臨坡地基極限承載力的計(jì)算模型。(2)根據(jù)上述計(jì)算理論和計(jì)算模型,分別使用極限平衡法和極限分析法推導(dǎo)了條形基礎(chǔ)下臨坡地基極限承載力的計(jì)算公式。進(jìn)而使用自編程序進(jìn)行了計(jì)算,并分析了眾多影響因素與三個承載力系數(shù)(N?、qN、CN)之間的關(guān)系。(3)將極限平衡法所得結(jié)果與極限分析法以及認(rèn)可度較高的Saran結(jié)果進(jìn)行了比較,分析了三者之間的誤差及產(chǎn)生誤差的原因。經(jīng)過對比可認(rèn)定,本文所得的計(jì)算公式便于在工程實(shí)際中使用,且精度相對較高,具有較高的參考價值及理論意義。(4)基于ABAQUS有限元軟件,計(jì)算分析了條形基礎(chǔ)下臨坡地基到達(dá)極限狀態(tài)時的破壞模式,獲得了臨坡地基極限承載力的有限元解,并與前文中的計(jì)算模型和計(jì)算結(jié)果進(jìn)行對照分析,從而對本文采用的理論基礎(chǔ)和計(jì)算公式的正確性進(jìn)行了驗(yàn)證。同時,系統(tǒng)地分析了地基土內(nèi)摩擦角、邊坡角、相對臨坡距、相對埋深、相對斜坡高度等因素對條形基礎(chǔ)下臨坡地基極限承載力的影響。
[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.
【學(xué)位授予單位】：西安理工大學(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：1882754