Abstract

Abstract In this study the laboratory test for hydraulic conductivity and the seepage analysis with finite element method on measurement section of sea dike embankment were performed for the purpose of estimating the rela tive density of embankment from the measured pore water pressur es, and both resultsof the test and the analysis were coupled with the method of estimating seepage blocki ng state with the hydr aulic head loss rat e in sea dike embankment.The relationship of void ratio vs hydraulic head loss rate was obtained by setting hydraulic conductivity as common ordinate on the relationships betweenthe void ratio and the hydraulic conductivity and between the hydraulic conductivity and the hydraulic head loss rate. The void ratio on the segment between measuring points was calculated from the coupled relationship of the void ratio vs the hydraulic conductivity. The allowable upper and lower limits of hydraulic head loss rate and those of void ratio on the safety were generated from the coupled relationship between t he laboratory compactio ntest and the sedimentation test. Current hydraulic head loss rate and void ratio were evaluated in the allowable range between upper and lower limits.Keywords: Hydraulic head loss rate; seepage; sea dike; pore water pressure; hydraulic conductivity*

Highlights

  • In this study the laboratory test for hydraulic conductivity and the seepage analysis with finite element method on measurement section of sea dike embankment were performed for the purpose of estimating the relative density of embankment from the measured pore water pressures, and both results of the test and the analysis were coupled with the method of estimating seepage blocking state with the hydraulic head loss rate in sea dike embankment

  • 이 연구에서는 방조제에서 계측한 공극수압을 안정관리를 위해서 효율적으로 해석할 수 있는 방법을 고안하고자 한 연 구들의 후속연구로써 계측단면의 축조재료에 대해서 투수시 험을 하여 공극비와 투수계수의 관계를 얻고 계측단면에 대 한 침투해석을 하여 투수계수와 수두손실률과의 관계를 얻어 서 수두손실률의 허용범위를 설정하고 공극비와 상대밀도를 산출할 수 있는 방법을 제시하고자 한다

  • Fig. 9에 있는 1열과 2열 사이에서는 수두손실률이 매우 낮은 값의 범위까지 해석이 진행되어서 직선구간의 연장선의 교점 이 공극비의 하한 기준과 일치하는지 확인하지 못하였으나 Fig. 10과 Fig. 11에서의 결과를 고려할 때 직선구간 연장선 의 교점에 의해서 수두손실률의 하한 기준을 설정하는 방법 은 신뢰성이 있는 방법으로 생각된다

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Summary

Introduction

In this study the laboratory test for hydraulic conductivity and the seepage analysis with finite element method on measurement section of sea dike embankment were performed for the purpose of estimating the relative density of embankment from the measured pore water pressures, and both results of the test and the analysis were coupled with the method of estimating seepage blocking state with the hydraulic head loss rate in sea dike embankment. 수두손실률, 투수계수 및 공극비의 상호관계를 통한 제체의 다짐상태 평가 이 연구에서는 방조제에서 계측한 공극수압을 안정관리를 위해서 효율적으로 해석할 수 있는 방법을 고안하고자 한 연 구들의 후속연구로써 계측단면의 축조재료에 대해서 투수시 험을 하여 공극비와 투수계수의 관계를 얻고 계측단면에 대 한 침투해석을 하여 투수계수와 수두손실률과의 관계를 얻어 서 수두손실률의 허용범위를 설정하고 공극비와 상대밀도를 산출할 수 있는 방법을 제시하고자 한다.

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