本文選題：強夯法　切入點：地基處理　出處：《西安工業(yè)大學(xué)》2011年碩士論文

【摘要】：近年來強夯的應(yīng)用越來越廣泛,現(xiàn)階段針對強夯法方面的研究大多是以現(xiàn)場試驗為主要的研究手段。雖然前人的研究成果積累了寶貴且豐富的試驗研究數(shù)據(jù),但是針對強夯施工在濕陷性黃土地區(qū)應(yīng)用的系統(tǒng)研究還有所不足,所以強夯法在濕陷性黃土地基應(yīng)用的進一步研究顯得十分重要。 本文總結(jié)了國內(nèi)外的研究成果,并主要進行了以下幾項研究工作：總結(jié)、分析國內(nèi)外關(guān)于強夯加固機理的研究成果,并結(jié)合黃土的特殊性提出強夯加固濕陷性黃土地基的機理；通過具體工程的試驗研究,對強夯加固濕陷性黃土地基的加固效果進行評價,并通過試驗數(shù)據(jù)的分析證實強夯的加固機理；通過數(shù)值模擬,對比分析試驗數(shù)據(jù)及理論結(jié)果,證明LS-DYNA3D應(yīng)用于強夯加固的可靠性。最后通過改變相應(yīng)的施工參數(shù)對強夯過程進行模擬,通過模擬結(jié)果對設(shè)計、施工參數(shù)進行優(yōu)化。 研究的基本結(jié)論：LS-DYNA3D程序應(yīng)用于強夯的數(shù)值模擬,具有較強的可靠性與適用性,在今后的強夯工程中可用于預(yù)測或分析；數(shù)值模擬和試驗結(jié)果表明在強夯過程中地基土具有明顯的波動性,反映出強夯作用于地基土?xí)r,夯擊能量是以震動波的形式傳播,最后被地基土吸收,改變了黃土的原有結(jié)構(gòu),黃土在震動波作用下被壓密；在同能量級條件下,采用重錘低落距和底面積大而密度小的施工參數(shù)的加固效果要優(yōu)于輕錘高落距和底面積小而密度大的組合；通過增大能量級,可以增大豎向加固影響深度,同時通過合理布置夯點間距,使深層地基土的位移產(chǎn)生疊加,可以達到提高深層土層的均勻性和強度目的。 論文的研究成果對于強夯法在濕陷性黃土地區(qū)應(yīng)用中的加固效果的預(yù)測或分析提供了很有參考價值的素材,同時對強夯應(yīng)用于濕陷性黃土地基處理時設(shè)計及施工參數(shù)的優(yōu)化有著積極的指導(dǎo)意義。
[Abstract]:In recent years, the application of dynamic compaction is more and more extensive.Although the previous research results have accumulated valuable and abundant experimental data, the systematic research on the application of dynamic compaction in collapsible loess areas is still insufficient.So it is very important to study the application of dynamic compaction method in collapsible loess foundation.This paper summarizes the research results at home and abroad, and mainly carries out the following research work: summing up, analyzing the research results of dynamic compaction reinforcement mechanism at home and abroad, and combining the particularity of loess, puts forward the mechanism of dynamic compaction strengthening collapsible loess foundation;The reinforcement effect of dynamic compaction on collapsible loess foundation is evaluated through the experimental study of concrete engineering, and the reinforcement mechanism of dynamic compaction is confirmed by the analysis of test data, and the experimental data and theoretical results are compared and analyzed by numerical simulation.The reliability of LS-DYNA3D used in dynamic compaction reinforcement is proved.Finally, the dynamic tamping process is simulated by changing the corresponding construction parameters, and the design and construction parameters are optimized by the simulation results.The basic conclusion of the study is that the application of the # LS-DYNA3D program to the numerical simulation of dynamic compaction has strong reliability and applicability, which can be used to predict or analyze the dynamic compaction in the future.The numerical simulation and experimental results show that the dynamic compaction of the foundation soil has obvious fluctuation, which reflects that when the dynamic compaction acts on the foundation soil, the tamping energy propagates in the form of vibration wave, and finally is absorbed by the foundation soil, which changes the original structure of loess.Loess is compacted under the action of vibration wave; under the condition of same energy level, the reinforcement effect with heavy hammer drop distance and construction parameters with large bottom area and low density is better than that with light hammer height drop distance and low bottom area and high density; by increasing the energy level, the reinforcement effect is better than that of light hammer high drop distance and low bottom area.The influence depth of vertical reinforcement can be increased and the displacement of deep foundation soil can be superimposed by reasonable arrangement of compaction point spacing which can improve the uniformity and strength of deep soil layer.The research results of this paper provide reference material for the prediction or analysis of the reinforcement effect of dynamic compaction method in collapsible loess area.At the same time, the application of dynamic compaction in the treatment of collapsible loess foundation design and construction parameters optimization has a positive guiding significance.
【學(xué)位授予單位】：西安工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TU753.8

【參考文獻】

相關(guān)期刊論文 前10條

1 高廣運,顧中華,周群利;強夯加固地基大變形動力有限元數(shù)值模擬[J];地下空間;2004年02期

2 宋章;程謙恭;張煒;孟凡超;;原狀黃土顯微結(jié)構(gòu)特征與濕陷性狀分析[J];工程地質(zhì)學(xué)報;2007年05期

3 林強,水偉厚;高能級強夯在港口工程地基處理中的應(yīng)用[J];港工技術(shù);2005年02期

4 孔令偉,袁建新;強夯作用下成層地基的表面接觸應(yīng)力分布特征[J];力學(xué)學(xué)報;1999年02期

5 逯海,水偉厚;強夯法有效加固深度影響因素的理論分析[J];石河子大學(xué)學(xué)報(自然科學(xué)版);2004年04期

6 水偉厚;王鐵宏;王亞凌;;10000kN·m高能級強夯作用下孔壓測試與分析[J];土木工程學(xué)報;2006年04期

7 謝能剛,王璐,邱晗;強夯動接觸力的碰撞分析與并行優(yōu)化求解[J];巖石力學(xué)與工程學(xué)報;2004年13期

8 孔令偉,袁建新;強夯時地基土的應(yīng)力場分布特征及應(yīng)用[J];巖土力學(xué);1999年03期

9 費香澤,王釗,周正兵;黃土強夯的模型試驗研究[J];巖土力學(xué);2002年04期

10 莊海洋;陳國興;梁艷仙;徐明;;土體動非線性黏彈性模型及其ABAQUS軟件的實現(xiàn)[J];巖土力學(xué);2007年03期

相關(guān)博士學(xué)位論文 前1條

1 水偉厚;沖擊應(yīng)力與10000kN.m高能級強夯系列試驗研究[D];同濟大學(xué);2004年

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