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홍원표,이광우,조삼덕,이재호 한국지반공학회 2006 한국지반공학회논문집 Vol.22 No.10
The lateral soil movement in soft grounds undergoing improvement with application of vertical drains is analyzed on the basis of monitoring data at three fields, in which fifty six monitoring sites are located. Based on the investigations, the criterions are suggested to predict the lateral soil movement. In order to predict the lateral soil movement in the improved soft grounds by using the dimensionless parameter R suggested by Marche & Chapuis (1974), it is desirable that the maximum lateral displacement in the soft ground below the toe of embankment should be applied to calculate R instead of the lateral displacement at the toe of embankment. The lateral soil movement may increase rapidly, if the safety factor of slope is less than 1.4 in case of high ratio of H/B (Thickness of soft ground/Embankment width) such as 1.15 or is less than 1.2 in case of low ratio of H/B such as 0.05. Also, the graph suggested by Tschebotarioff (1973), which illustrates the relationship between the maximum height of embankments and the undrained shear strength of soft grounds, can be applied to the evaluation for the possibility of the lateral soil movement due to embankments on soft grounds.
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홍수시 월류를 고려한 콘크리트 가물막이댐의 파괴확률 산정
홍원표,송창근 한국안전학회 2020 한국안전학회지 Vol.35 No.5
In order to construct a dam, the diversion facility such as cofferdam and a diversion tunnel should be installed in advance. And size of a cofferdam depends on type of a main dam. According to the Korea Dam Design Standard, if the main dam is a concrete dam, design flood of the cofferdam is 1~2 years flood frequency. This means that overflow of the cofferdam occurs one time for 1 or 2 years, therefore, stability of the cofferdam should be secured against any overflow problem. In this study, failure probability analysis for the concrete cofferdam is performed considering the overflow. First of all, limit state function of the concrete cofferdam is defined for overturning, sliding and base pressure, and upstream water levels are set as El. 501 m, El. 503 m, El. 505 m, El. 507 m. Also, after literature investigation research, probabilistic characteristics of various random variables are determined, the failure probability of the concrete cofferdam is calculated using the Monte Carlo Simulation. As a result of the analysis, when the upstream water level rises, it means overflow, the failure probability increases rapidly. In particular, the failure probability is largest in case of flood loading condition. It is considered that the high upstream water level causes increase of the upstream water pressure and the uplift pressure on the foundation. In addition, among the overturning, the sliding and the base pressure, the overturing is the major cause for the cofferdam failure considering the overflow.
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건물 지하층에 설치된 자가발전기실의 환기제어 모델 시스템에 관한 연구
홍원표,강병권 한국조명전기설비학회 2000 조명·전기설비학회논문지 Vol.14 No.2
This paper presents a new ventilation control model system of standby generating room installed in basement of building. The regulation problem & current status of ventilation system considered the architectural construction and building service facility procedure are also investigated. The regulation solution, ventilation control model system and its theoretical analysis for room of the generating system by driven diesel are proposed from the analyzed results of survey. 대전지역의 자가발전시스템의 20 개소의 실태조사의 분석자료을 통하여 자가발전기실의 환기시스템의 문제점을 파악하고 이와 관련된 국내외 관련 법규플 조사.비교 분석한 자료를 토대로 다이젤구동형 자가발전기실의 환기시스템의 이론해석 및 새로운 환기제어방식을 제안하였다.
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