연직배수재 타설 후 장기간 경과된 지반의 통수성능 = Discharge Capacity of Prefabricated Vertical Drain Confined In-Clay Under Long-Term Conditions

다국어 초록 (Multilingual Abstract)

Typically, soft clay improvement is carried out using installation of PVD and surcharge method. According to circumstances, installed PVD has left for a long time due to the change in construction schedule. Therefore, for simulation of this kind of condition, discharge capacity tests were carried out under a series of temperature condition (30, 35, 40°C). The results indicated that under water confinement, the discharge capacities significantly reduced with elapsed time. And, the empirical equation by Miura and Chai (2000) was used for estimating the long-term in-clay discharge capacity. Based on the test results, it is recommended that in term of long-term discharge capacity, Miura and Chai’s equation and reliability evaluation using discharge capacity tests under a series of temperature condition may be used.

국문 초록 (Abstract)

연약점토 지반 개량을 위해 연직배수재 타설 후 선행재하공법이 일반적으로 적용되는데, 현장에서의 시공계획 변경 등으로인해 연직배수재 타설 후 장기간 방치되는 경우가 종종 발생된다. 따라서 장기간 방치된 조건에서의 연직배수재 열화 현상을고려하기 위해 구속압으로 적용되는 수온을 각각 30, 35, 40°C를 적용하였다. 그 결과, 시간경과에 따라 배수성능이 급격히저하되는 경향을 나타냈다. 그리고 현장 원위치 조건, 즉, 점토 구속조건하에서 장기간 통수능 저하 정도를 평가하기 위하여Miura와 Chai(2000)식을 적용하였다. 그 결과, 온도 변화 조건에서 수행된 통수능 시험결과를 이용한 신뢰성 해석 방법과Miura와 chai(2000)식을 적용하여 장기 통수능을 평가할 수 있는 것으로 평가되었다.

참고문헌 (Reference)

1 Arrehenius, S. A., "Uber die Dissociationswarme und den Einfluss der Temperatur auf den Dissociationsgrad der Elektrolyte" 4U (4U): 96-116, 1889

2 Korea Reliability Certification Center, "Prefabricated vertical drain board for soft ground improvement"

3 "KS K ISO 18325, Geosynthetics-Test method for the determination of water discharge capacity for prefabriacated vertical drains"

4 "KS K 0940 , Test method for discharge capacity of plastic drain board"

5 Miura. N., "Investigation on some factors affecting discharge capacity of prefabricated vertical drain" 845-850, 1998

6 Chai, J. C., "Investigation of factors affecting vertical drain behavior" 125 (125): 216-226, 1999

7 Miura. N., "Discharge capacity of prefabricated vertical drain confined in-clay" Japan Chapter of International Geosynthetics Society 15 : 2000

8 "ASTM D4716, Standard test method for determining the (in-plane) flow rate per unit width and hydraulic transmissivity of a geosynthetic using a constand head"

9 Waloddi Weibull, "A Statistical Distribution Function of Wide Applicability" 1951