本文選題：強(qiáng)夯 + 施工參數(shù)��； 參考：《石家莊經(jīng)濟(jì)學(xué)院》2013年碩士論文

【摘要】：強(qiáng)夯法是一種方便快捷、經(jīng)濟(jì)環(huán)保的地基處理方法。自問世以后，便很快在全世界流行開來。對于強(qiáng)夯法，最終的目標(biāo)是以最少的夯擊能，達(dá)到預(yù)期的加固效果。強(qiáng)夯法加固地基的思想起源于古老的夯實法，施工過程很簡單。雖然強(qiáng)夯法目前應(yīng)用很廣泛，可是至今也沒有一套完整的理論指導(dǎo)強(qiáng)夯法的設(shè)計。強(qiáng)夯法沖擊地面時的荷載為非線性荷載，并且由于土體發(fā)生非線性塑性變形，運用傳統(tǒng)的解析法去研究強(qiáng)夯的過程是非常困難的。目前的主要做法還是借助數(shù)值模擬技術(shù)進(jìn)行求解。強(qiáng)夯法加固理論的研究主要集中于兩個方面：動力固結(jié)理論和振動波密實理論。對于強(qiáng)夯法的施工參數(shù)與加固效果的關(guān)系研究，主要是一些工程人員結(jié)合自己的工程實際，開展了一些強(qiáng)夯實驗研究。目前，對強(qiáng)夯法的設(shè)計主要是基于以往的實踐經(jīng)驗。 本文先總結(jié)了強(qiáng)夯法的發(fā)展歷程及研究現(xiàn)狀，分析了強(qiáng)夯法的動力固結(jié)理論和震動波密實理論，，在此基礎(chǔ)上，對強(qiáng)夯各施工參數(shù)與加固效果的關(guān)系進(jìn)行了深入的分析，以青島市政建物流園地基強(qiáng)夯工程為例，分析了強(qiáng)夯施工參數(shù)組合與加固效果的關(guān)系。最后，使用當(dāng)前非常流行的巖土工程數(shù)值模擬軟件FLAC3D對該工程進(jìn)行了數(shù)值模擬分析。本文所作的工作主要有： （1）從理論上對強(qiáng)夯加固機(jī)理進(jìn)行了總結(jié)和分析，包括動力固結(jié)理論和震動波壓密理論； （2）對強(qiáng)夯法的設(shè)計施工參數(shù)進(jìn)行了全面分析，對各參數(shù)對加固效果的影響進(jìn)行了詳細(xì)的評價； （3）結(jié)合工程實例，分析了強(qiáng)夯法施工參數(shù)組合對地基加固效果的影響； （4）運用波動理論，推導(dǎo)出了夯錘夯擊時，接觸應(yīng)力峰值大小，以及加載和卸載時間； （5）運用FLAC3D程序建立有限差分?jǐn)?shù)值分析模型，將理論推導(dǎo)的接觸應(yīng)力時程輸入到模型中，模擬強(qiáng)夯的施工過程； （6）對模型所作出的動力響應(yīng)，進(jìn)行了相關(guān)數(shù)據(jù)采集和計算機(jī)制圖，對輸出結(jié)果進(jìn)行了全面系統(tǒng)的分析。分析了強(qiáng)夯后土體的應(yīng)力應(yīng)變情況、土體的加固深度以及單擊夯沉量、單點夯沉量等，全方位研究了土體的應(yīng)力和位移變化情況。
[Abstract]:Dynamic compaction is a convenient, economical and environmental protection method for foundation treatment. Ever since it came out, it has been very popular all over the world. For dynamic compaction, the ultimate goal is to achieve the desired reinforcement effect with minimum tamping energy. The idea of dynamic compaction is originated from the old ramming method, and the construction process is very simple. Although the dynamic compaction method is widely used at present, there is not a complete set of theory to guide the design of the dynamic compaction method. The dynamic compaction method is nonlinear when it hits the ground, and because of the nonlinear plastic deformation of soil, it is very difficult to use the traditional analytical method to study the process of dynamic compaction. At present, the main method is to use numerical simulation technology to solve the problem. The study of dynamic consolidation theory mainly focuses on two aspects: dynamic consolidation theory and vibration wave compaction theory. For the study of the relationship between the construction parameters of the dynamic compaction method and the reinforcement effect, some engineers have carried out some experimental research on dynamic compaction combined with their own engineering practice. At present, the design of dynamic compaction is mainly based on previous practical experience. In this paper, the development history and research status of dynamic compaction method are summarized, and the dynamic consolidation theory and vibration wave density theory of dynamic compaction method are analyzed. On this basis, the relationship between construction parameters of dynamic compaction and reinforcement effect is deeply analyzed. Taking the foundation dynamic compaction project of Qingdao Municipal Construction Logistics Park as an example, the relationship between the combination of dynamic compaction construction parameters and the reinforcement effect is analyzed. Finally, the geotechnical engineering numerical simulation software FLAC3D is used to simulate the geotechnical engineering. The main work done in this paper is as follows: 1) summarize and analyze the reinforcement mechanism of dynamic compaction theoretically, including dynamic consolidation theory and vibration wave compaction theory; 2) the design and construction parameters of dynamic compaction method are comprehensively analyzed, and the influence of each parameter on reinforcement effect is evaluated in detail. (3) combined with engineering example, the influence of dynamic compaction construction parameters combination on foundation reinforcement effect is analyzed. (4) the peak value of contact stress, loading and unloading time of tamping hammer are deduced by using wave theory. 5) the finite difference numerical analysis model is established by using FLAC3D program, and the time history of contact stress derived from theory is inputted into the model to simulate the construction process of dynamic compaction. 6) for the dynamic response of the model, the related data acquisition and computer mapping are carried out, and the output results are analyzed systematically. The stress and strain of the soil after dynamic compaction, the depth of soil reinforcement, the amount of single tamping and single point compaction are analyzed, and the variation of stress and displacement of soil is studied in all directions.
【學(xué)位授予單位】：石家莊經(jīng)濟(jì)學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU472.31

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 孫雨明,高廣運,邱暢,梁濤;帽子模型在強(qiáng)夯動應(yīng)力計算中的應(yīng)用[J];地下空間;2003年02期

2 高廣運,顧中華,周群利;強(qiáng)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

3 高廣運,李志毅,黃誠;強(qiáng)夯的非線性有限元分析和施工參數(shù)優(yōu)化[J];地下空間;2004年04期

4 孟慶山,汪稔;飽和軟粘土動力固結(jié)機(jī)理及實用工藝研究[J];長江科學(xué)院院報;2004年05期

5 韓文喜,張倬元,李強(qiáng);利用強(qiáng)夯模擬試驗研究飽和砂土強(qiáng)夯動本構(gòu)關(guān)系[J];工程地質(zhì)學(xué)報;2001年04期

6 張學(xué)武,阮文保;強(qiáng)夯塊石墩復(fù)合地基的應(yīng)用[J];工程勘察;2000年03期

7 陳超;徐長節(jié);蔡袁強(qiáng);;強(qiáng)夯加固回填土地基振動特性的三維數(shù)值模擬[J];哈爾濱工業(yè)大學(xué)學(xué)報;2009年12期

8 錢家歡,帥方生;邊界元法在地基強(qiáng)夯加固中的應(yīng)用[J];中國科學(xué)(A輯 數(shù)學(xué) 物理學(xué) 天文學(xué) 技術(shù)科學(xué));1987年03期

9 童小東,蔣永生,龔維明,盧盛松;強(qiáng)夯法加固地基的三維有限元動力分析[J];建筑結(jié)構(gòu);2000年05期

10 姚小霞;動力置換強(qiáng)夯加固軟土地基[J];建筑技術(shù);1999年03期

本文編號：1947347