[논문]간극수 염분농도에 따른 동결 사질토의 부동수분곡선 산정 및 검증 연구

김희원; 고규현

doi:10.7843/kgs.2023.39.11.53

간극수 염분농도에 따른 동결 사질토의 부동수분곡선 산정 및 검증 연구
Measurement and Verification of Unfrozen Water Retention Curve of Frozen Sandy Soil Based on Pore Water Salinity 원문보기

韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.39 no.11, 2023년, pp.53 - 62

김희원 (금오공과대학교 토목공학과) , 고규현 (금오공과대학교 토목공학과)

초록
AI-Helper

동결토의 부동수분특성은 지반의 열-수리-역학적 거동 전반에 걸쳐 지배적인 영향을 미치며, 동결 지반의 안정성 평가를 위해서는 대상 지반재료의 부동수분특성에 대한 면밀한 검토가 필요하다. 본 연구에서는 간극수 염분농도를 고려한 동결 사질토의 부동수분곡선을 평가하기 위하여 흙의 어는점 및 부동수분을 측정하는 실내 실험을 수행하였으며, 계측된 실험데이터를 기반으로 부동수분포화도 곡선을 간편하게 추정할 수 있는 경험적 모델을 새롭게 제시하였다. 또한, 제안된 경험적 모델을 입력자료로 적용한 해석모델의 시뮬레이션 결과를 실험데이터와 비교함으로써 사용된 부동수분곡선의 적정성을 검증하였다.

Abstract ▼ AI-Helper

The characteristics of unfrozen water content in frozen soils significantly impact the thermal, hydraulic, and mechanical behavior of the ground. A thorough analysis of the unfrozen water content characteristics of the target subsoil material is crucial for evaluating the stability of frozen ground. This study conducted indoor experiments to measure the freezing point and unfrozen water content of sandy soil while considering pore water salinity. Utilizing the experimental data, we introduced a novel empirical model to conveniently estimate the unfrozen water retention curve. Furthermore, the validity of the unfrozen water retention curve was assessed by comparing the experimental data with the results of a simulation model that utilized the proposed empirical model as input data.

주제어

표/그림 (12)

그림 Fig. 1. Experimental technologies for the measurement of unfrozen water contents at subzero temperatures
그림 Fig. 2. Temperature distribution of sandy soil according to porewater salinity
표 Table 1. Empirical models established by unfrozen water content dataset
그림 Fig. 3. Artificial salt water manufacturing process. (a) Weighing process to meet target salinity, (b) Salt dissolution process using hotplate with magnetic stirrer, (c) Preparation of sea water and artificial salt water
그림 Fig. 4. Comparison of effective thermal conductivity of sandy soil with instant sea water and real sea water (initial gravimetric water content = 31%, porosity = 0.46)
그림 Fig. 5. Freezing point variation of sandy soil according to porewater salinity
표 Table 2. Measured salinity of pure water, real sea water, instant sea water
그림 Fig. 6. Experimental setup for measurement of the unfrozen water content of frozen sandy soil
그림 Fig. 7. Unfrozen water saturation curve according to porewater salinity. (a) ζ=0%, (b) ζ=3.5%, (c) comparison results in T-Tf temperature domain
그림 Fig. 8. Boundary conditions of the simulation model
표 Table 3. Material properties used in the simulation model
그림 Fig. 9. Comparison results of soil temperature during freezing (experiment and simulation)

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