ON ESTIMATING THE DEGREE OF COMPACTION OF IN-SERVICE EMBANKMENT USING DYNAMIC CONE PENETRATION TEST AND PARTICLE SIZE CHARACTERISTICS

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  • 動的コーン貫入試験と粒度特性を用いた既設盛土の締固め度推定方法の検討

Abstract

<p> In this paper, a method for estimating the degree of compaction of in-service embankment by having the result of dynamic cone penetration (DCP) test. Based on the results of laboratory DCP test performed using a chamber comprising the compacted soil to different degrees, an empirical equation for estimating the degree of compaction by using the number of blows from the DCP test, Nd-value, the particle size at 80 percent passed, D80, and the fines content, Fc is proposed. The applicability of the proposed equation was fairly well validated by showing that the estimated degree of compaction was close to the measured value. The degree of compaction for an embankment exhibiting variations of the Nd-value as well as the grain size distribution was similar when compacted under similar conditions. In this case study, the importance of estimating the degree of compaction, which in turn enables using to estimate the angle of shearing resistance was successfully demonstrated. By considering the fact that the Nd-value decreases as the water content increases, it is described that the proposed equation provides safer side of the estimate applicable to embankments having the water content higher than the optimum value.</p>

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