本文選題：靜力觸探 + 貫入機(jī)理��； 參考：《長(zhǎng)沙理工大學(xué)》2013年碩士論文

【摘要】：靜力觸探（Cone Penetration Test，CPT）技術(shù)與傳統(tǒng)的測(cè)試技術(shù)相比，其具有可測(cè)得連續(xù)的土體資料、測(cè)試數(shù)據(jù)精確且性能穩(wěn)定、測(cè)試快速可連續(xù)貫入、可測(cè)得土體深層數(shù)據(jù)等優(yōu)點(diǎn)。靜力觸探作為一種可靠的兼具勘探和測(cè)試雙重作用的巖土工程測(cè)試技術(shù)，已被廣大巖土工程技術(shù)人員應(yīng)用于巖土工程中，但目前對(duì)靜力觸探的貫入機(jī)理還無法在理論上完全解釋清楚，因此對(duì)其許多方面的研究工作還處在長(zhǎng)期不懈的探索之中，相關(guān)學(xué)科至今仍然不能完全從理論層面上分析貫入器與土體之間的應(yīng)力場(chǎng)和位移場(chǎng)的相關(guān)問題。因此，對(duì)貫入器的貫入行為進(jìn)行更深入的分析研究，對(duì)靜力觸探技術(shù)的發(fā)展和推廣具有重要的理論意義和工程應(yīng)用價(jià)值。 本論文首先查閱了大量國(guó)內(nèi)外文獻(xiàn)資料，分析了國(guó)內(nèi)外承載力理論、孔穴擴(kuò)張理論、有限元分析法等的研究現(xiàn)狀及其在實(shí)際工程中的應(yīng)用情況。通過靜力觸探有關(guān)測(cè)試結(jié)果分析勻質(zhì)砂土、勻質(zhì)粉質(zhì)土以及粘土-砂土雙層模型中觸探貫入?yún)?shù)的變化規(guī)律，并探討靜力觸探貫入機(jī)理。 然后采用應(yīng)力跌落的簡(jiǎn)化應(yīng)力應(yīng)變模型，考慮土體屈服后所表現(xiàn)出的強(qiáng)度軟化特性，根據(jù)空間準(zhǔn)滑動(dòng)面（SMP）理論和平面應(yīng)變軸對(duì)稱問題的柱形孔穴擴(kuò)張基本方程，在塑性區(qū)內(nèi)采用不相關(guān)聯(lián)流動(dòng)法則和對(duì)數(shù)應(yīng)變定義分別考慮剪脹效應(yīng)和大應(yīng)變特性，推導(dǎo)出一般粘性土中基于圓柱孔穴擴(kuò)張理論的彈性區(qū)域理論解和塑性區(qū)域小應(yīng)變理論相關(guān)解。 最后考慮靜力觸探過程中土體的大變形特性以及土體的剪脹性質(zhì)，采用莫爾-庫侖模型，分析建立了有限元分析計(jì)算模型，應(yīng)用有限元分析軟件ABAQUS進(jìn)行數(shù)值模擬，計(jì)算分析靜力觸探探頭貫入后土體的位移、應(yīng)力的變化規(guī)律，通過工程實(shí)例的計(jì)算分析驗(yàn)證建立的有限元分析模型的可行性。同時(shí)，比較了不同土體參數(shù)對(duì)應(yīng)力與位移場(chǎng)的影響規(guī)律，建立土體各物理參數(shù)與有限元計(jì)算的錐尖阻力和側(cè)壁阻力之間的計(jì)算公式，并與經(jīng)驗(yàn)公式進(jìn)行比較分析。
[Abstract]:Compared with the traditional testing technique, the static Penetration Penetration testing (CPT) technique has the advantages of measuring continuous soil mass data, accurate and stable testing data, rapid and continuous penetration, and so on. As a reliable geotechnical engineering testing technology with both exploration and test functions, static penetration exploration has been applied to geotechnical engineering by the vast number of geotechnical personnel. But at present, the penetration mechanism of static penetration can not be fully explained in theory, so many aspects of its research work is still in the process of long-term unremitting exploration. Up to now, the related problems of stress field and displacement field between the penetrator and the soil can not be completely analyzed from the theoretical level. Therefore, it is of great theoretical significance and engineering application value for the development and popularization of static penetration technology to conduct more in-depth analysis and research on the penetration behavior of the penetrator. In this paper, a large number of literature at home and abroad are reviewed, and the research status and application of the theory of bearing capacity, the theory of cavity expansion, the finite element analysis and so on in practical engineering are analyzed in this paper. The variation of penetration parameters in homogeneous sandy soil, homogeneous silty soil and clay sand bilayer model is analyzed by the results of static penetration test, and the penetration mechanism of static penetration is discussed. Then, the simplified stress-strain model of stress drop is adopted, considering the strength softening characteristic of soil after yielding, according to the theory of spatial quasi-sliding surface (SMP) and the basic equation of cylindrical cavity expansion for plane strain axisymmetric problem. In the plastic region, the shear expansion effect and the large strain characteristic are considered by the law of disassociation flow and the definition of logarithmic strain, respectively. The theoretical solution of elastic region and the correlation solution of small strain theory of plastic region based on cylindrical cavity expansion theory in general cohesive soil are derived. Finally, considering the characteristics of large deformation and shear dilatancy of soil in the process of static penetration, a finite element analysis model is established by using Mohr Coulomb model, and the finite element analysis software ABAQUS is used to carry out numerical simulation. The variation law of soil displacement and stress after the penetration of the static penetration probe is calculated and analyzed. The feasibility of the established finite element analysis model is verified by the calculation and analysis of an engineering example. At the same time, the effects of different soil parameters on the force and displacement field are compared, and the formulas between the physical parameters of soil and the cone tip resistance and lateral wall resistance calculated by finite element method are established and compared with the empirical formula.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU43

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 ;砂類土靜力觸探機(jī)理的模型實(shí)驗(yàn)[J];長(zhǎng)沙鐵道學(xué)院學(xué)報(bào);1984年01期

2 夏增明;蔣崇倫;孫渝文;;靜力觸探模型試驗(yàn)及機(jī)理分析[J];長(zhǎng)沙鐵道學(xué)院學(xué)報(bào);1990年03期

3 崔新壯,丁樺;靜力觸探錐頭阻力的近似理論與實(shí)驗(yàn)研究進(jìn)展[J];力學(xué)進(jìn)展;2004年02期

4 陳鐵林,沈珠江,周成;用大變形有限元對(duì)土體靜力觸探的數(shù)值模擬[J];水利水運(yùn)工程學(xué)報(bào);2004年02期

5 姜蘭芳,解磊,毛林斌,楊繼革,歐陽建華;沈陽市區(qū)地基土載荷試驗(yàn)成果分析[J];水文地質(zhì)工程地質(zhì);1997年01期

6 陳維家,汪火旺;靜力觸探中土層界面效應(yīng)試驗(yàn)研究[J];水文地質(zhì)工程地質(zhì);2003年02期

7 房峻松;高明軍;;負(fù)壓下軟土大變形數(shù)值分析[J];西部探礦工程;2006年02期

8 王鐘琦;再談我國(guó)的靜力觸探及動(dòng)靜觸探的發(fā)展前景——兼答孟高頭先生[J];巖土工程學(xué)報(bào);2001年03期

9 劉松玉,吳燕開;論我國(guó)靜力觸探技術(shù) (CPT)現(xiàn)狀與發(fā)展[J];巖土工程學(xué)報(bào);2004年04期

相關(guān)博士學(xué)位論文 前1條

1 胡士兵;沉樁擠土球孔擴(kuò)張理論研究和數(shù)值模擬分析[D];浙江大學(xué);2007年

相關(guān)碩士學(xué)位論文 前1條

1 陸鳳慈;靜力觸探技術(shù)在海洋巖土工程中的應(yīng)用研究[D];天津大學(xué);2005年

，

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