• 한국지반공학회지:지반
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• 제14권4호
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• pp.77-90
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• 1998

본 연구에서는 /K cell(286\times254\times119mm)$을 이용하여 해성점토 지반에서의 electrokinetic 공법에 의한 지반개량효과를 비교 연구하였다. 남해안 해성점토에 대해서 순수 재하시험과 저전압을 이용한 전기삼투시험, 그리고 고전압을 이용한 전기영동시험을 실시한 결과, 저전압 전기삼투에 의한 지반개량 효과가 제일 컸으며, 고전압 전기영동에 의한 지반개량효과는 거의 없는 것으로 나타났다. 또한 전기삼투시험에서는 전류가동시간과 전류밀도가 클수록, 즉 전력소모량이 많을수록 지반 개량효과가 크게 나타났다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.231-238
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• 2005

Incompetent sediments and competent volcanics are consisted of the Cenozoic geology in Korea. Although the Cenozoic area is small, it is necessary to special interesting for ground of these geological material. The Cenozoic geology shows heterogeneous characteristics. We can look at the weak Cenozoic sedimentary rocks under the hard Cenozoic basalt in the area. Some Cenozoic un(or half)-consolidated soft sediments have large, heavy and hard boulders. Some volcanics and tuffaceous sediments have swelling clays. These characteristics give very difficult problems to engineering geologists and civil engineers.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2007년 가을학술발표회
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• pp.383-395
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• 2007

As a state-of-the-art paper related to consolidation settlement, the 31th Terzaghi lecture was briefly described. Case histories that are compared between predicted and measured settlements in the Nakdong River deltaic plane were introduced to show the true picture of our technology. Structures and other features of clays in this country were needed to understand, which are closely related to sample disturbance and also consolidation properties. In order to improve the settlement-related technology, some problems that we have faced and their alternatives were considered.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.161-170
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• 2006

Bender elements, composed of thin piezo-ceramics and elastic shims, have been used to measure shear wave velocities of specimens in laboratories. In a preliminary stage of their field applications, an in-house research of optimizing suitable bender elements and geometrical arrangement has been carried out in a barrel of kaolinite-water mixture. Two types of measurement configuration, similar to cross-hole and in-hole seismic testing, has been implemented. A pair of prototype instrumented rods was penetrated into a soft clay layer in the west coast and excellent shear waves were recorded. Development of penetration device(mandrel) and associated instrumented rods are in progress for deeper investigation.

• Geomechanics and Engineering
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• 제15권4호
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• pp.957-964
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• 2018

In this study, a method of electrochemical consolidation is applied. This method utilizes electro-osmosis, which is an effective ground improvement technique for soft clays, and soil treatment using lime, which is the oldest traditional soil stabilizer. The mechanism of lime treatment for soil involves cation exchange, which leads to the flocculation and agglomeration. Five representative laboratory tests-an electro-osmotic test and four electrochemical tests with various proportions of lime-were performed on dredged marine clay. The objectives of this study are to investigate the effect of electrochemical treatment and to determine the optimum dose for optimal consolidation performance of dredged marine clay. The results show that a better consolidation effect was achieved in terms of current, temperature, and vane shear strength by using electrochemical treatment. The best results were observed for the electrochemical test using 4% lime content.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.483-490
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• 2004

Nakdong River Plain and its adjoining sea arc unusually covered by very thick soft clay sediments which were caned Pusan clays, sometimes reaching 40-70m. Since early 1990s a large number of geotechnical investigations have been carried out for land reclamation works in the area, including Busan city and its neighboring cities. Nevertheless, geotechnical engineers have paid little attention to studying geological characteristics on the clays, except some researches related to mineralogy, geo-chemistry, benthic foraminiferal fauna etc. The purpose of reserach is the knowledge of the correlation between engineering properties and mineralogy of clay sediments. The correlation analysis carry out multiple regression that have independent variables (Engineering properties) and dependent variables (mineralogy, geochemistry). Engineering properties of clay are correlated with the mineral compositions and geochemical characteristics. The result of the analysis is Wn = -0,6Feldspar + 1.1pH + 0.01TDS + 27.5, Ip = 0.36Clay + 1.44Vermiculite + 0.94clay mineral - 22.118, PI. = 0.005TDS - 0.31Feldspar + 22.43, eo = 0.02Vermiculite - 0.01Quartz + TDS + 0.93, ${\nu}$t = 0.009Quartz - 0.06Conductivity + 1.67, E50 = 1.94Vermicuhte - 0.96Kaohnite -0.53silt + 49.64, SR = -0.25Kaolinite + 1.5pH -2.3Conductivity, Cc = 0.03pH + TDS -0.2, LL = 0.5Clay + 1.3Vermiculite + 5.5Conductivity + 0.8Caly mineral -20.48

• 한국지반공학회논문집
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• 제27권7호
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• pp.69-79
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• 2011

실내시험은 다양한 응력조건과 배수조건의 모사가 가능하므로 상용 유한요소 해석프로그램의 입력변수 산정에 필수적인 요소가 되나 시료의 운송, 시료추출, 트리밍, 함수비 손실, 응력이완으로 인한 교란과 채취가 관입시의 교란으로 양질의 시료를 얻는데 한계가 있다. 이러한 한계를 극복하기 위하여 교란에 따른 시료의 변화를 이해하고 이를 실내 시험 결과로부터 입력변수 산정에 적용할 수 있는 방법을 찾아내는 것이 필요하다. 따라서 본 연구에서는 정확한 입력정수의 산정이 필수적인 연약점성토의 교란에 대한 영향을 파악하고자 정규압밀 점성토의 교란에 따른 강도 및 강성의 변화를 삽축시험기를 이용한 응력경로시험을 통하여 파악하였다. 그 결과, 교란의 정도가 강도에 미치는 영향은 크지 않았으나, 전단강성계수와 커플링강성계수의 변형률에 따른 감쇠 경향에는 큰 영향을 미치는 것으로 나타났다.

• 한국지반공학회논문집
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• 제24권8호
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• pp.61-79
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• 2008

준설매립지반에서의 압밀침하는 종종 구조물에 큰 피해를 끼친다. 최근 국내에서는 대규모 프로젝트들이 대심도 연약지반 상에 계획 또는 진행 중에 있다. 따라서, 준설매립지반에 대한 압밀특성의 평가는 설계와 시공에 있어서 매우 중요하다고 할 수 있다. 본 연구에서는, 광양항 인근 지역에서 채취한 시료를 이용, 준설매립지반의 압밀특성을 평가하기 위하여 압밀시험을 실시하였으며, 선행압밀하중은 기존에 제안된 8가지 방법들을 이용하여 산정하였다. 이중에서, 준설매립지반의 선행압밀하중 산정시, Becker(1987), Silva(1970), Sridharan(1991) 방법의 적용성이 뛰어난 것으로 평가되었다.

• 한국지반공학회논문집
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• 제24권7호
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• pp.43-50
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• 2008

준설매립지반에서의 압밀침하는 종종 구조물에 큰 피해를 끼친다. 최근 국내에서는 대규모 프로젝트들이 대심도 연약지반 상에 계획 또는 진행 중에 있다. 따라서, 장기압밀침하에 대한 평가는 설계와 시공에 있어서 매우 중요한 사항이라고 할 수 있으므로, 본 연구에서는, 준설매립지반의 장기압밀특성에 대한 연구를 수행하였다. 첫 번째로, 광양 인근 지역의 준설매립지반에 대한 $C_{\alpha}/C_c$의 관계를, 두 번째로, 유사과압밀지반의 장기압밀특성에 대해 평가하였다.

• 산업기술연구
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• 제25권A호
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• pp.57-65
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• 2005

In this paper, for the highly plastic marine soft clay distributed in west and southern coast of Korean peninsula of Kwangyang and Busan New Port areas, correlation between compression index and other indices representing geotechnical engineering properties such as liquid limit, void ratio and natural water content were analyzed. Appropriate empirical equations of being able to estimate the compressibility of clays in the specific areas were proposed and compared with other existing empirical ones. For analyses of the data and test results, data for marine clays were used from areas of the South Container Port of the Busan New Port, East Breakwater, Passenger Quay, Jungma Reclamation and Reclamation Containment in the 3rd stage in Kwangyang. In order to find the best regression model by using the commercially available software, MS EXCEL 2000, results obtained from the simple linear regression analysis, using the values of liquid limit, initial void ratio and natural water content as independent variables, were compared with the existing empirical equations. Multiple linear regression was also performed to find the best fit regression curves for compression index and other soil properties by combining those independent variables. On the other hands, another software of SPSS for non-linear regression was used to analyze the correlations between compression index and other soil properties.