• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 가을 학술발표회 논문집
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• pp.431-438
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• 1999

Vertical congressive and horizontal pile load tests were performed to a instrumented large diameter (D : 1,000 mm) drilled shaft. A drilled shaft was penetrated into the weathered soil and weathered rock. PMT was done for evaluation of properties for these strata. It was expected to be difficult to get undisturbed samples of weathered soils and rocks. Thus. PMT was done at the several selected depths. In those strata, to prevent the test bore hole from collapsing, bentonite slurry was used for making the test bore hole. In this study. soil properties was evaluated by means of PMT results and estimating method (direct method, the Memard method) of vertical pile capacity and horizontal pile behaviors were summarized. Also, vertical and horizontal pile capacity were calculated using PMT and pile load test results.

• 한국환경복원기술학회지
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• 제3권3호
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• pp.1-7
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• 2000

The aim of the work described in this paper is to study the shear characteristics of the weathered granite soil. To this end, a series of consolidated undrained triaxial compression tests are carried out to investigate the shear parameters-cohesion and internal friction angle for the degree of saturation and degree of weathering. From the results, it is found that the shear parameters of weathered granite soil are influenced on the degree of saturation, degree of weathering and disturbance. Especially, internal friction angle is more influenced on the upper factors than cohesion. And shear parameters are more acted on the degree of saturation than the degree of weathering in the test range. It is, therefore, recommended that must be considered the conditions of granite soil-degree of saturation, degree of weathering and disturbance etc-in case of the calculation of bearing capacity, stability analysis and other designs with shear parameters.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.139-146
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• 2001

Undrained triaxial tests were peformed for a weathered soil, which includes local measurement using LVDT The behavior from small In large strain conditions could be evaluated consistently through a triaxial test, The stress-strain relationship of undisturbed samples were compared with the disturbed and the shear moduli in the small strain level had the almost same values. Especially the shear moduli were mostly affected by the initial condition of water contents. An anisotropic hardening model based on the total stress concept could predict the stress-strain relationship accurately, which makes it possible to analyze the geotechnical problem reasonably for the weathered soil.

• 한국농공학회논문집
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• 제50권1호
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• pp.61-68
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• 2008

It is essential to analyze and classify the physical characteristics of weathered granite for engineering purposes. This paper is to suggest a physical method to determine the degree of weathering of weathered soils. A new classification method for determining the degree of weathering is suggested, based upon the results from laboratory tests including fall cone test. According to the proposed physical method using fall cone apparatus, the measured values of the samples from the same area show distinctive difference of weathering. The water content tends to increase with increasing the degree of weathering at the same penetration in fall cone test. And relationship between CWI and water content are expressed one equation in Hwaseong area and Ilsan area.

• 한국지반공학회논문집
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• 제18권1호
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• pp.29-39
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• 2002

본 연구에서는 미소변형률에서 파괴규준을 포함하는 대변형률에 이르는 전체 변형률 영 역의 거동을 획득하기 위하여, LVDT를 장착하여 국부변위를 측정한 삼축압축시험을 수행하였다. 이러한 결과 미소변형률(0.001% 수준)에서 대변형를까지(10%)의 거동을 합리적으로 구할 수 있었으며, 불교란 및 교란 풍화토 시료에서의 변형계수가 미소변형률 영역에서 유사하게 나타났다. 그리고 공진주(RC)시험과 비배수 삼축압축시험에서 구한 정규화 전단변형계수$(G/G_{max})$ 곡선이 일치한 반면 최대전단변형계수$(G/G_{max})$는 포화도에 따라 상이하게 나타났다. 또한 비등방경화 구성모델의 계수 연구를 통하여 전체 변형률 영역 거동을 합리적으로 예측할 수 있음을 확인하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 춘계 학술발표회
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• pp.679-686
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• 2010

Mechanical characteristics of bottom ash produced in coal-fired power plant are investigated to utilize as light-weight fill materials. Triaxial compression test, water retention test, and unsaturated direct shear test were conducted for weathered soil (WS), reclaimed bottom ash (RBA), and screened bottom ash (BA). RBA had larger frictional angle and lower effective cohesion than those of WS. Water retention charactersitics of RBA and BA existed within distributions of soil-water characteristic curves for domestic weathered soils. Unsaturated shear strength of RBA was similar to that of WS at matric suctions of 50 kPa and 100 kPa. As a conclusion, bottom ash can be used as fill materials to replace the conventional construction materials by.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.860-865
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• 2006

In order to predict the stability of slopes, it is important to evaluate shear strength of unsaturated soils. The triaxial tests were performed under $K_0$ conditions for unsaturated soils and the results were compared with those for saturated soils. In unsaturated soils, the secant modul and the shear strengths are larger than those of saturated soils because of matric suctions. However the shear strengths were not affected severely by stress conditions at consolidation.

• 한국도로학회:학술대회논문집
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• 한국도로학회 2006년도 학술발표회 논문집
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• pp.205-210
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• 2006

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1998년도 가을 학술발표회 논문집
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• pp.65-72
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• 1998

• 한국지반공학회지:지반
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• 제9권3호
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• pp.5-22
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• 1993

우리나라의 화강암 풍화토(CW와 RC풍화등급)의 불교란시료에 대한 일련의 토질물성 및 역 학적 특성실험이 수행되었다. 화강암 풍화토는 크게 CW 및 RS 풍화등급으로 나뉘어지며, 풍화가 많이 진행됨에 따라서 토질 물성이 매우 예민하게 변화하고, 일축압축강도 및 전단강도지수도 급격히 감소할 뿐만 아니라, 또한 변형특성은 풍화가 많이되고 침수됨에 따라서 화강암풍화토가 점차로 ductile하고 plastic하게 변해가는 특성이 있다. 또한 화강암 풍화토는 침수가 됨에 따라서 특이한 성질이 있는 것으로 관찰되었다: (1) 전단강 도(특히 점착력) 및 일축압축강도가 급격히 감소할 뿐만 아니라, (2) 물과의 반응시에 화강암 풍 화토의 입자가 쉽게 약해져서 더욱 작은 입자크기로 분해된다.