낙동강 하구 상부퇴적사질토의 통수능 평가

Abstract

This research focused on the region of the Eco Delta City Project Site, a site utilization project through the soft ground improvement of the Nakdong River estuary, to identify whether the upper sand deposit has the role of horizontal drainer in the Eco Delta Region.

Firstly, samplingand field and laboratorytests were carried out to identify the physical and mechanical properties of the upper sand deposit. As the results, the distribution depth was 4 to 13 m and the N value ranged from 3 to 12m as the result of standard penetration test, being distributed in much loose state, having good permeability in the permeability test.

In evaluating the possibility of application as horizontal drainer based on the size distribution curve of the upper sand deposit, the fraction of fine particles in some sections is 20% or larger and does not satisfy the horizontal drainer criteria, but satisfies the criteria if the content of fine particles (less than 5%) is low.

GTS NX, an universal analysis program was used to conduct numerical analysis, and the average degree of consolidation of soft ground in case of appling the sand mat and the upper sand deposit were compared. As the results of numerical analysis, the upper sand deposit in the delta region may play similar roles as sand matwhen accumulated to be 2m or more. As a result of the numerical analysis conducted by different the permeability coefficients of the upper sand deposit layer to show the generalized guideline data, it was found that there is a difference according to the permeability coefficient, butthe difference is small when P.V.D is applied.