【摘要】：本文對(duì)使用切線模量法合理確定地基承載力進(jìn)行了研究。通過(guò)使用太沙基公式計(jì)算極限承載力，并使用切線模量法計(jì)算實(shí)際基礎(chǔ)的p-s曲線，通過(guò)基礎(chǔ)沉降和安全系數(shù)兩個(gè)方面進(jìn)行控制，以確定合理的地基承載力。具體工作為： 1、通過(guò)設(shè)定的4種土體，利用FLAC數(shù)值方法，設(shè)定不同寬度的基礎(chǔ)，對(duì)太沙基極限承載力公式的寬度效應(yīng)進(jìn)行了驗(yàn)證，說(shuō)明太沙基公式中寬度對(duì)承載能力的貢獻(xiàn)是基本正確的。但對(duì)于軟土，太沙基公式中寬度取值應(yīng)采用實(shí)際基礎(chǔ)寬度的一半。 2、對(duì)于規(guī)范采用限定基礎(chǔ)寬度大于6m時(shí)按6m計(jì)算來(lái)確定地基承載力特征值的情況進(jìn)行了研究。通過(guò)計(jì)算不同尺寸時(shí)4種軟硬不同的地基的極限承載力，其中采用FLAC數(shù)值方法和太沙基極限承載力公式進(jìn)行計(jì)算；對(duì)于沉降使用以Mohr-Coulomb為本構(gòu)模型的數(shù)值方法和切線模量法計(jì)算，按強(qiáng)度安全系數(shù)和沉降雙控原則確定承載力，，與規(guī)范方法確定的承載力進(jìn)行了比較。結(jié)果表明規(guī)范方法確定承載力時(shí)，在硬土地基上沉降較小偏保守，在軟土地基上會(huì)出現(xiàn)沉降過(guò)大而偏不安全。因此，合理確定承載力的方法應(yīng)是按強(qiáng)度安全系數(shù)和沉降雙控原則。 3、利用幾個(gè)原位壓板試驗(yàn)和實(shí)際工程案例，對(duì)以切線模量法確定承載力進(jìn)行了驗(yàn)證，證明采用太沙基公式計(jì)算極限承載力，使用切線模量法計(jì)算沉降，通過(guò)雙控原則確定承載力更符合工程實(shí)際。
[Abstract]:In this paper, the method of tangent modulus is used to determine the bearing capacity of foundation. The ultimate bearing capacity is calculated by using the Taishaki formula and the p-s curve of the actual foundation is calculated by using the tangent modulus method. The foundation settlement and safety factor are controlled to determine the reasonable bearing capacity of the foundation. The specific work is as follows: 1. The width effect of the ultimate bearing capacity formula of Terzaghi is verified by the FLAC numerical method and the foundation of different widths. It shows that the contribution of width to bearing capacity is basically correct. However, for soft soil, the width should be taken as half of the actual foundation width in the formula of Taishaji, and the characteristic value of foundation bearing capacity should be calculated according to 6m when the limited width of foundation is greater than 6m in the code. The ultimate bearing capacity of four different soft and hard foundations with different sizes is calculated, in which FLAC numerical method and Terzaghi ultimate bearing capacity formula are used to calculate the settlement, and the Mohr-Coulomb constitutive model and tangent modulus method are used to calculate the settlement. The bearing capacity is determined according to the principle of strength safety factor and double control of settlement, and compared with the bearing capacity determined by the standard method. The results show that when the bearing capacity is determined by the code method, the settlement on the hard soil foundation is less conservative, and the settlement on the soft soil foundation is too large and unsafe. Therefore, the reasonable method of determining bearing capacity should be based on the principle of strength safety factor and double control of settlement. 3. Several in-situ compression plate tests and practical engineering cases are used to verify the determination of bearing capacity by means of tangent modulus method. It is proved that the ultimate bearing capacity is calculated by using the Taizhaji formula and the settlement is calculated by the tangent modulus method. The calculation of the bearing capacity by double control principle is more in line with the engineering practice.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU470

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉慶潭,劉啟鳳,華祖q,魏麗敏;用極限平衡方法確定加筋土地基的極限承載力[J];長(zhǎng)沙鐵道學(xué)院學(xué)報(bào);1997年04期

2 滕延京;;《建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范》地基承載力概念的理解與應(yīng)用[J];工程勘察;2004年03期

3 顧寶和;;地基承載力的來(lái)龍去脈[J];工程勘察;2004年03期

4 楊光華;關(guān)于巖土力學(xué)與工程的發(fā)展問(wèn)題[J];廣東水利水電;2000年06期

5 楊光華;根據(jù)經(jīng)驗(yàn)地基承載力反算土的強(qiáng)度和變形參數(shù)[J];廣東水利水電;2002年01期

6 張盧明;鄭明新;何敏;鄭玉之;;深基坑開(kāi)挖與錨桿支護(hù)FLAC~(3D)數(shù)值模擬分析[J];華東交通大學(xué)學(xué)報(bào);2007年05期

7 張展君;朱小林;;基礎(chǔ)埋深對(duì)地基承載力的影響[J];結(jié)構(gòu)工程師;1990年03期

8 翟洪飛;宰金珉;;地基承載力確定標(biāo)準(zhǔn)的研究[J];江蘇建筑;2007年02期

9 蔣洪勝;淺基礎(chǔ)地基承載力的若干問(wèn)題[J];建筑技術(shù);2000年03期

10 滕延京;地基基礎(chǔ)設(shè)計(jì)規(guī)范與國(guó)外規(guī)范分項(xiàng)安全系數(shù)取值對(duì)比分析[J];建筑科學(xué);1999年05期

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