[논문]화강풍화토에 대한 함수특성곡선 - 실험방법에 대한 연구

이성진; 이승래

화강풍화토에 대한 함수특성곡선 - 실험방법에 대한 연구
Soil Water Characteristic Curve for Weathered Granite Soils - A Test Method 원문보기

韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.21 no.2, 2005년, pp.17 - 26

이성진 (Research Development Team, GS E&C) , 이승래 (Dept. of Civil & Environmental Engrg., KAIST)

초록
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함수특성곡선은 불포화지반에서의 해석과 물성 추정 등에 반드시 고려해야 하는 지반의 고유 특성이다. 하지만 기존의 실험장비에 의한 실험 중에 발생되는 시료의 부피변화는 함수특성곡선 결과에 영향을 비치게 된다. 따라서 본 연구에서는 함수특성곡선 실험 중에 발생되는 부피변화를 측정하여 보다 정확한 함수특성곡선을 얻고자 하였다. 그리고 실험과정 중에 관측된 간극비의 변화를 통해 실험 초기의 포화과정이 시료의 구조를 변화시키고 있음을 알 수 있었다. 따라서 본 연구에서는 기존의 설험방법으로 실험을 수행한 시료에 대해 실험 초기의 포화과정을 생략한 실험을 수행하여 간극비의 변화가 상대적으로 크게 감소하는 것을 알 수 있었으며, 그 결과들을 비교, 분석하였다.

Abstract ▼ AI-Helper

Soil water characteristic curve (SWCC) is a unique characteristic that should be considered In the analysis of unsaturated soil and prediction of unsaturated properties. However, the volume change of soil specimens that happens in the existing apparatus affects the SWCC, Therefore, In this study, we intended to obtain more appropriate SWCC by measuring the change In the volume of the specimen in the SWCC tests. The measured change of void ratio indicates that the saturation step prior to the test changes the original structure of the soil specimen. Thus we carried out the test far the same specimen omitting the saturation step prior to the test. The change of void ratio by this test procedure is relatively small.

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문제 정의

In this study, the soil water characteristic tests were carried out for undisturbed samples and compacted specimens of weathered granite soils, obtained from Okchun, Chochiwon, Yungi, and Seochang areas in Korea (Table 2, Table 3). These tests were here performed under various conditions, that is, the conditions such as the compacted water content and void ratio are different, considering that the purpose of this study is to predict the soil water characteristic curve of weathered granite soils for the above conditions.

제안 방법

To put it more concretely, the tests for theses specimens and the following 'NS' symbolspecimens were earned out by repeating the drying process and wetting process at each initial condition. Additionally, the more tests were carried out for some specimens (Fig. 5 and Table 3) artificially composed, in order to effectively use the test results to grasp the trends of the soil water characteristic curves for domestic weathered granite soils from the basic soil properties, including particle size distribution.
In this study, the soil water characteristic tests were carried out for undisturbed samples and compacted specimens of weathered granite soils, obtained from Okchun, Chochiwon, Yungi, and Seochang areas in Korea (Table 2, Table 3). These tests were here performed under various conditions, that is, the conditions such as the compacted water content and void ratio are different, considering that the purpose of this study is to predict the soil water characteristic curve of weathered granite soils for the above conditions.
1998, 2000). In this study, the volume change (i.e., the change of void ratio) could be measured by modifying the existing volumetric pressure plate extractor that can obtain the SWCC for both wetting and drying processes. The proximity transducer shown in Fig.
One of the features in the test process used in this study, is to measure the volume change of the specimen during the drying and wetting processes. The volume changes measured were used in the computations of volumetric water content in SWCC.
However, the tests for specimens such as C-Cl (NS), C-C2 (NS), O-C2 (NS), O-C3 (NS), Y-Cl (NS), Y-C2 (NS), Y-C3 (NS), S-Cl (NS) and S-C2 (NS) are performed without saturation process. To put it more concretely, the tests for theses specimens and the following 'NS' symbolspecimens were earned out by repeating the drying process and wetting process at each initial condition. Additionally, the more tests were carried out for some specimens (Fig.
We modified the apparatus and the test procedure in order to reasonably obtain soil water characteristic curve and carried out the tests for weathered granite soil. The following results were obtained:

대상 데이터

4 is the noncontacting transducers that operate on an eddy current loss principle. The device consists of a sensor and an aluminum target put on the top of the soil specimen. An eddy current is induced in aluminum target by a coil in the sensor.

성능/효과

(3) It is conjectured that the hysteresis was larg이y generated and the original structure of the specimen was changed, since the excessive volume change happened during the initial saturation stage in the test procedure including the initial saturation stage.

참고문헌 (7)

Fredlund, D. G. and Rahardjo, H. (1995), Soil Mechanics for Unsaturated Soils, John Wiley & Sons Inc
Lee, I. M., Lee, H. J., and Kim, K. S. (2000), 'Soil-water characteristic curves of residual soils and deformable soils', Korean Geotechnical Society, National Conference, Mar, pp.265-272
Lee, S. J. (2004), 'Estimation of Unsaturated Shear Strength and Soil Water Characteristic Curve for Weathered Granite Soil', Ph.D. thesis, KAlST, Korea
Ng, C. W. W. and Pang, Y. W. (2000), 'Experimental investigations of the soil-water characterics of a volcanic soil', Canadian Geotechnical Journal, 37, pp.1252-1264

상세보기
Ng, C. W. W. and Shi, Q. (1998), 'A numerical investigation of the stability of unsaturated soil slopes subjected to transient seepage', Computers and Geotechnics, Vol.22, No.2, pp.1-28

상세보기
Sillers, W. S., Fredlund, D. G., and Zakerzadeh, N. (2001), 'Mathematical attributes of some soil water characteristic curve models', Geotechnical and Geological Engineering, Vol.19, pp.243-283

상세보기
Vanapalli, S. K. (1994), 'Simple test procedures and their interpretation in evaluating the shear strength of unsaturated soils', Ph.D. thesis, University of Saskatchewan, Saskatoon

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화강풍화토에 대한 함수특성곡선 - 실험방법에 대한 연구
Soil Water Characteristic Curve for Weathered Granite Soils - A Test Method 원문보기

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화강풍화토에 대한 함수특성곡선 - 실험방법에 대한 연구 Soil Water Characteristic Curve for Weathered Granite Soils - A Test Method 원문보기

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Soil Water Characteristic Curve for Weathered Granite Soils - A Test Method 원문보기

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