【摘要】：近年來,強夯法的理論及應(yīng)用研究也逐步展開,雖然存在一定量的宏觀理論解釋,而土體有其特殊性質(zhì),從微觀角度來解釋強夯加固機理的理論更為合理。本文充分結(jié)合實際工程遼寧北鎮(zhèn)滿族高級中學食堂地基加固工程問題的需要,對于新近回填土為主體的強夯加固機理及現(xiàn)場工程試驗做出評價分析與研究,重點開展以下工作：通過幾種常見強夯加固理論的比較分析,對于本文工程實例中地基土的特性(新近回填土)做出理論選擇；并在此基礎(chǔ)上提出有效加固深度的經(jīng)驗公式的范圍系數(shù)p,以及在簡化地基加固模式下的有效加固深度計算公式；與夯擊能、夯擊次數(shù)、夯擊間距等設(shè)計重要因素進行對比分析,對于類似工程給出參考。本文通過平板載荷試驗、觸探試驗、瑞利面波試驗對新近土的回填工程強夯施工結(jié)果進行檢測,得出經(jīng)過強夯加固后地基承載力值符合設(shè)計值要求；同時進一步驗證本文提出的有效加固深度修正系數(shù)及簡化公式的計算值是否達到設(shè)計標準及影響因素分析。鑒于現(xiàn)場工程試驗的結(jié)果數(shù)量有限,并且施工中受天氣、人員等因素影響,本文重點將數(shù)值模擬的結(jié)果與現(xiàn)場檢測數(shù)據(jù)作比較。通過有限差分軟件來模擬強夯加固過程,觀察填土地基的豎向位移變化和夯擊后的應(yīng)力應(yīng)變變化,以及分析彈塑性區(qū)域相應(yīng)變化是為了判斷夯擊后的最大影響深度的界限值,使得簡化公式及試驗結(jié)果的準確度再次得到驗證。本文對強夯法加固地基的設(shè)計理論、現(xiàn)場檢測試驗和數(shù)值模擬進行了較為系統(tǒng)的研究,得出的結(jié)論對強夯法加固地基的進一步研究和工程應(yīng)用有一定的幫助。
[Abstract]:In recent years, the research on the theory and application of dynamic compaction has been carried out step by step. Although there is a certain amount of macroscopic theoretical explanation, and soil has its special properties, it is more reasonable to explain the mechanism of dynamic compaction from the microscopic point of view. In this paper, according to the needs of the actual project, the reinforcement mechanism of dynamic compaction and the field engineering test, which is the main body of the new backfill soil, are evaluated and studied in order to meet the needs of the foundation strengthening project of Manchu senior middle school in Beizhen, Liaoning Province. The main work is as follows: through the comparison and analysis of several common dynamic compaction reinforcement theories, the characteristics of foundation soil (recently backfilled) in the engineering example of this paper are selected theoretically; On this basis, the range coefficient p of the empirical formula for effective reinforcement depth and the calculation formula of effective reinforcement depth under simplified foundation reinforcement mode are put forward, which are compared with the important design factors such as ramming energy, tamping times, tamping spacing, and so on. A reference is given for similar projects. Through plate load test, penetration test and Rayleigh surface wave test, the results of dynamic compaction construction of recent soil backfill project are tested, and the results show that the bearing capacity value of foundation strengthened by dynamic compaction meets the requirements of design value. At the same time, it is further verified whether the calculated values of the effective depth correction coefficient and the simplified formula are up to the design standard and the analysis of the influencing factors. In view of the limited number of results of field engineering tests and the influence of weather, personnel and other factors in construction, this paper mainly compares the results of numerical simulation with the field test data. The finite difference software is used to simulate the consolidation process of dynamic compaction, to observe the variation of vertical displacement and stress and strain after tamping, and to analyze the corresponding changes of elastic-plastic region in order to judge the limit value of the maximum influence depth after tamping. The simplified formula and the accuracy of the test results are verified again. In this paper, the design theory, field testing test and numerical simulation of the dynamic compaction method for foundation strengthening are systematically studied, and the conclusions are helpful to the further research and engineering application of the dynamic compaction method.
【學位授予單位】：東北大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU472.31

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本文編號：2196739