An Analytical Study on the Determination of the Lowest Improvement Depth of Deep Mixing Method

IF 0.4 Q4 ENGINEERING, GEOLOGICAL Journal of the Korean Geosynthetic Society Pub Date : 2020-01-01 DOI:10.12814/JKGSS.2020.19.1.035
Choonsik Park, Ji-won Song
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Abstract

Design techniques for the deep mixing method, one of the soft ground improvement methods, include two ways to interpret the ground as composite ground and pile ground. However, since comparative studies on these two approaches are insufficient, it is difficult to clearly define the analysis criteria in the design. In this study, two-dimensional and three-dimensional analyses have been performed with different conditions. The three conditions, the embankment height, depth of soft ground, and replacement ratio of reinforcement zones were varied and the analysis was performed on the basis of the assumption of composite ground and pile ground for each condition. As a result, the minimum depth of improvement in the twodimensional analysis was deeper by 6.85∼9.08% than in the three-dimensional analysis. The pile ground analysis showed that the depth of improvement was deeper by 12.22∼ 14.45% than the composite ground analysis. Based on these results, it is concluded that for more accurate design, three-dimensional analysis should be performed rather than two-dimensional analysis. also, it is judged that necessary to analyze the ground as composite ground for economical design, and as the pile ground analysis for stable design.
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深层搅拌法最低改进深度确定的分析研究
深层搅拌法是软土地基加固方法之一,其设计技术包括复合地基和桩基两种解释方法。然而,由于对这两种方法的比较研究不足,在设计中很难明确界定分析标准。在本研究中,在不同条件下进行了二维和三维分析。在不同路堤高度、软基深度、配筋区置换率3种情况下,分别假设复合地基和桩基础进行分析。结果,二维分析的最小改善深度比三维分析深6.85 ~ 9.08%。桩基分析结果表明,改善深度比复合地基分析深12.22 ~ 14.45%。基于这些结果,得出结论,为了更精确的设计,应该进行三维分析而不是二维分析。同时认为,为了经济设计,有必要将地基作为复合地基进行分析,为了稳定设计,有必要将地基作为桩基础进行分析。
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