本文選題：強(qiáng)夯法　切入點(diǎn)：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(qiáng)夯的應(yīng)用越來越廣泛,現(xiàn)階段針對(duì)強(qiáng)夯法方面的研究大多是以現(xiàn)場(chǎng)試驗(yàn)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(yàn)研究數(shù)據(jù),但是針對(duì)強(qiáng)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(qiáng)夯法在濕陷性黃土地基應(yīng)用的進(jìn)一步研究顯得十分重要。 本文總結(jié)了國(guó)內(nèi)外的研究成果,并主要進(jìn)行了以下幾項(xiàng)研究工作：總結(jié)、分析國(guó)內(nèi)外關(guān)于強(qiáng)夯加固機(jī)理的研究成果,并結(jié)合黃土的特殊性提出強(qiáng)夯加固濕陷性黃土地基的機(jī)理；通過具體工程的試驗(yàn)研究,對(duì)強(qiáng)夯加固濕陷性黃土地基的加固效果進(jìn)行評(píng)價(jià),并通過試驗(yàn)數(shù)據(jù)的分析證實(shí)強(qiáng)夯的加固機(jī)理；通過數(shù)值模擬,對(duì)比分析試驗(yàn)數(shù)據(jù)及理論結(jié)果,證明LS-DYNA3D應(yīng)用于強(qiáng)夯加固的可靠性。最后通過改變相應(yīng)的施工參數(shù)對(duì)強(qiáng)夯過程進(jìn)行模擬,通過模擬結(jié)果對(duì)設(shè)計(jì)、施工參數(shù)進(jìn)行優(yōu)化。 研究的基本結(jié)論：LS-DYNA3D程序應(yīng)用于強(qiáng)夯的數(shù)值模擬,具有較強(qiáng)的可靠性與適用性,在今后的強(qiáng)夯工程中可用于預(yù)測(cè)或分析；數(shù)值模擬和試驗(yàn)結(jié)果表明在強(qiáng)夯過程中地基土具有明顯的波動(dòng)性,反映出強(qiáng)夯作用于地基土?xí)r,夯擊能量是以震動(dòng)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(dòng)波作用下被壓密；在同能量級(jí)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(jí),可以增大豎向加固影響深度,同時(shí)通過合理布置夯點(diǎn)間距,使深層地基土的位移產(chǎn)生疊加,可以達(dá)到提高深層土層的均勻性和強(qiáng)度目的。 論文的研究成果對(duì)于強(qiáng)夯法在濕陷性黃土地區(qū)應(yīng)用中的加固效果的預(yù)測(cè)或分析提供了很有參考價(jià)值的素材,同時(shí)對(duì)強(qiáng)夯應(yīng)用于濕陷性黃土地基處理時(shí)設(shè)計(jì)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(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TU753.8

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