The Study on The Numerical Analysis Method for Ground Improved by Cement Mixing Method

IF 0.4 Q4 ENGINEERING, GEOLOGICAL Journal of the Korean Geosynthetic Society Pub Date : 2018-12-01 DOI:10.12814/JKGSS.2018.17.4.041
Byungill Kim, Kang-Han Hong, Young-Seon Kim, Sang-jae Han
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Abstract

Since the composite ground design method is easy to apply for calculation or numerical analysis, it is applied to the design of cement mixing methods. However, the comparison studies between analysis and actual results such as a trial test and construction for the cement mixing method are few because the composite ground design method was developed for the compaction pile (SCP, GCP) methods. In this study, the results of various analysis methods, such as the composite ground analysis method (1 case) and the individual pile method (3 cases), were compared with actual measurements through a two-dimensional finite element numerical analysis. In case of the surface settlements, the results of study show that the individual plate method was larger than the actual measurements, while other methods are similar. The settlements at the under ground of the improved area is overestimated in all analysis methods. When comparing numerical analysis results for the horizontal displacement, and ground reaction forces, the individual pile method in equivalent wall concept was found to be the most similar to the measurements. The composite ground method was not able to predict the behavior of stress transfer (Arching effect) and it turned out that the prediction of horizontal displacement was too large.
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水泥搅拌法加固地基的数值分析方法研究
由于复合地基设计方法易于应用于计算或数值分析,故将其应用于水泥搅拌方法的设计。然而,由于密实桩(SCP、GCP)方法的复合地基设计方法的发展,对水泥搅拌法的分析与实际结果的对比研究(如试验和施工)很少。本研究通过二维有限元数值分析,将复合地基分析法(1例)和单桩法(3例)等多种分析方法的结果与实际测量结果进行对比。对于地表沉降,研究结果表明,单板法比实际测量值大,而其他方法相似。所有分析方法均高估了改进区地下沉降。通过对水平位移和地面反力的数值分析结果进行比较,发现等效墙概念下的单桩法与实测结果最接近。复合地基法不能预测应力传递行为(拱效应),且预测水平位移过大。
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