Experimental Study on the Reinforcement Effect of Geogrid in Soft Ground Improvement

IF 0.4 Q4 ENGINEERING, GEOLOGICAL Journal of the Korean Geosynthetic Society Pub Date : 2018-01-01 DOI:10.12814/JKGSS.2018.17.2.001
H. Ham, Lee Sang Duk
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Abstract

The number of construction of roads and railroads in soft ground such as coastal areas and wetlands is getting increased. For this reason cases that soft ground improvement is applied are increasing. In general, many ground improvement methods consider only the working conditions at the time or only economy. But if the working condition and economy are taken into consideration together, the number of applicable construction method gets limited. In such a case, a ground improvement method using both the surface layer portion and the deep layer portion is applied. But the basic research on this is still insufficient in practice. Therefore, in this study the reinforcement effect of geogrid was investigated by carrying out the model test realizing the case in which soft surface ground improvement and depth improvement are simultaneously applied. And it was intened to understand the effect of the thickness of surface layer, the diameter and length of the improvement body on the reinforcement effect of geogrid. The result showed that the effect of the surface layer thickness is greater than the effect of the deep layer diameter. Moreover, when the surface layer is reinforced with a geogrid, the strength of the surface layer part is enhanced and this effect of a geogrid reinforcement caused the reduction of surface settlement. 요 지 해안지대나 습지와 같은 연약지반에 도로나 철도 건설이 빈번해지면서 이를 위한 연약지반 개량 사례가 증가하고 있다. 일반적 으로 연약지반 개량시 작업조건만을 고려하거나 경제성만을 고려한 공법은 다수 존재하나 작업조건과 경제성을 함께 고려할 경우 적용 가능한 공법은 제한적이다. 이러한 경우 표층부와 심층부를 병용하여 개량하는 공법이 적용되어지는데, 이에 대한 기초적인 연구가 부족한 현실이다. 따라서, 본 연구에서는 연약지반에서 표층부 개량과 심층부 개량을 병용하는 경우에 대해 모형시험을 수행하여 지오그리드 보강 효과를 확인하고자 하였으며, 이때 표층부의 두께, 심층부 개량체의 직경 및 길이가 지오그리드 보강 효과에 미치는 영향을 파악하고자 하였다. 그 결과 표층부의 두께가 심층부의 직경보다 보강효과가 크다는 것을 확인하였고, 또한 표층부를 지오그리드로 보강한 경우 표층부의 강도가 증진되어 침하량이 저감됨을 확인하였다.
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土工格栅加固软土地基试验研究
在沿海地区和湿地等软土地上建设公路和铁路的项目正在增加。因此,采用软土地基改造的案例越来越多。一般来说,许多地面改善方法只考虑当时的工作条件或只考虑经济性。但如果同时考虑施工条件和经济性,适用的施工方法就有限了。在这种情况下,应用使用表面层部分和深层部分的地面改善方法。但在实践中,这方面的基础研究还很不足。因此,本研究通过模型试验来研究土工格栅的加固效果,实现软地表加固与深度加固并举的情况。并试图了解面层厚度、改进体直径和长度对土工格栅加固效果的影响。结果表明,表层厚度的影响大于深层直径的影响。此外,当表层加装土工格栅加固时,表层部分的强度得到增强,土工格栅加固的这种效果导致表面沉降减少。요지해안지대나습지와같은연약지반에도로나철도건설이빈번해지면서이를위한연약지반개량사례가증가하고있다。일반적으로연약지반개량시작업조건만을고려하거나경제성만을고려한공법은다수존재하나작업조건과경제성을함께고려할경우적용가능한공법은제한적이다。이러한경우표층부와심층부를병용하여개량하는공법이적용되어지는데,이에대한기초적인연구가부족한현실이다。따라서,본연구에서는연약지반에서표층부개량과심층부개량을병용하는경우에대해모형시험을수행하여지오그리드보강효과를확인하고자하였으며,이때표층부의두께,심층부개량체의직경및길이가지오그리드보강효과에미치는영향을파악하고자하였다。그결과표층부의두께가심층부의직경보다보강효과가크다는것을확인하였고,또한표층부를지오그리드로보강한경우표층부의강도가증진되어침하량이저감됨을확인하였다。
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