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        마이크로 시멘트로 그라우팅 된 모래의 일축압축강도 예측

        남홍엽,이우진,이창호,추현욱 한국지반공학회 2018 한국지반공학회논문집 Vol.34 No.7

        The unconfined compressive strength (UCS) test through coring is widely used to determine the reinforcement effect of the ground with grouting. However, the UCS test through coring can disturb the ground, is expensive and takes a lot of time to prepare the specimen. In this study, the factors affecting UCS of microfine cement grouted sand are evaluated and an empirical equation of UCS of microfine grouted sand is suggested. It is observed that UCS increases linearly until 28 days, however, the increasing rate of strength decreases sharply after that 28 days. The W/C ratio is dominant factor influencing UCS and UCS increases exponentially with the decrease of water/cement (W/C) ratio. Also, UCS increases linearly with increasing the relative density ranging from 30% to 70% and with decreasing median particle size. However, in case of W/C ratio=1 and K6 (D50=0.47 mm), UCS is lower than that of K4 (D50=1.08 mm) and K5 (D50=0.80 mm) due to filtration effect. Based on the experimental results, the empirical equation of UCS of microfine cement grouted sand can be expressed as the function of median particle size (D50), porosity (n) and W/C ratio.

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