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정해근,서용석,Jeong, Hae-Geun,Seo, Yong-Seok 한국터널지하공간학회 2013 한국터널지하공간학회논문집 Vol.15 No.4
본 연구에서는 터널 갱구사면을 대상으로 사면안정성 및 산사태 위험도를 평가하였다. 먼저 사면안정성 해석을 통해 붕괴위험도가 가장 높은 구간을 선정하고 구체적인 붕괴규모를 파악하였다. 해석결과 해발고도 485~495 m인 구간은 강우시 안전율이 0.99로 불안정한 상태로 나타났다. 이 때 붕괴심도는 최대 2.1 m이며 붕괴 길이는 사면의 경사방향으로 18.6 m로 분석되었다. 해당구간에서 사면붕괴 시 파생되는 사태물질의 이동특성을 실시간으로 분석하고 터널 갱구부에 미치는 영향을 파악하고자 산사태 시뮬레이션 해석을 수행하였다. 해석결과 사태물질은 7.74 m/sec의 평균속도를 보이며 주로 계곡부를 따라 산 하부로 이동하는 것으로 분석되었다. 사태물질은 산 하부로 갈수록 점차 확산되며 10초 후에 터널 갱구부 위를 지나고 20.2초 후에 산하부에 도달하는 것으로 분석되었다. 특히 터널 갱구부는 사태물질 이동경로의 중심부에 위치하고 있어 산사태 발생 시 직접적인 피해를 받는 것으로 나타났다. In this study, the slope stability analysis and the landslide hazard assessment in tunnel portal slope were carried out. First, we selected highly vulnerable areas to slope failure using the slope stability analysis and analyzed the slope failure scale. According to analyses results, high vulnerable area to slope failure is located at 485~495 m above sea level. The slope is stable in a dry condition, while it becomes unstable in rainfall condition. The analysis results of slope failure scale show that the depth of slope failure is maximum 2.1 m and the length of slope failure is 18.6 m toward the dip direction of slope. Second, we developed a 3-D simulation program to analyze characteristics of runout behavior of debris flow. The developed program was applied to highly vulnerable areas to slope failure. The result of 3-D simulation shows that debris flow moves toward the central part of the valley with the movement direction of landslide from the upper part to the lower part of the slope. 3-D simulation shows that debris flow moves down to the bottom of mountain slope with a speed of 7.74 m/s and may make damage to the tunnel portal directly after 10 seconds from slope failure.
저변성퇴적암 사면에서 지질특성이 차별풍화에 미치는 영향
정해근,서용석,임명혁,Jeong, Hae-Geun,Seo, Yong-Seok,Ihm, Myung-Hyeok 한국터널지하공간학회 2013 한국터널지하공간학회논문집 Vol.15 No.4
This study evaluates correlation between petrographic characteristics and weathering grade of low-graded metasedimentary rocks mainly consisting of phyllite. Weathering grade of rock material was determined based on the results of geological survey. The Schmidt hammer test was carried out to obtain estimates of strength of rock materials. Point counting and microscopic observation were also conducted to analyze mineral composition and to measure spacing of foliation for 9 rock specimens. As a result of microscopic analysis, as the weathering grade was lower, the quartz was found more in quantity, consequently making rock stronger against weathering process. On the other side, lower weathering grade of rock resulted in less content of mica which is weak against weathering process. In addition, the rock materials with closer foliation spacing are found to be weaker in strength and have higher weathering grade. 본 논문에서는 천매암을 중심으로 저변성퇴적암류에 속하는 암석을 대상으로 암석학적 특징과 풍화도의 상관성에 대하여 분석하였다. 현장 지질조사를 통하여 암석의 풍화도를 결정하였고, 구성암석의 강도 값을 추정하기 위하여 슈미트해머 테스트를 실시하였다. 9개 시료의 현미경 박편 관찰을 통하여 주구성광물의 부피비와 엽리의 간격을 측정하였다. 암석시료의 현미경 분석 결과에 의하면 풍화도가 낮을수록 풍화에 강한 석영성분이 많고, 풍화도가 높을수록 풍화에 약한 운모성분이 많은 것으로 나타났다. 또한 엽리 간격이 좁을수록 강도는 낮고 풍화도는 높은 것으로 나타났다.
특급호텔 레스토랑 주방조직 내 역할갈등이 직무만족, 조직몰입 및 이직의도에 미치는 영향
정해근(Jeong, Hae-Geun) 한국외식산업경영학회 2020 외식산업경영연구 Vol.16 No.1
This study was analyzed about relationship belong role conflict, the satisfaction of the job, immersion in the job and intention of turnover in a kitchen group for chefs at a special hotel restaurant. The concept of each variable was examined and document research and empirical analysis were made to see if these variables were related. For the purpose of empirical analysis, 300 questionnaires were conducted for the chefs working at the special hotel restaurant in Seoul from June 1, 2018, to June 30, 2018. The statistical program of SPSS 21.0 was used to analyze the data of the questionnaire and the frequency analysis was conducted to examine the general characteristics of the sample. For measurement variables, the exploratory factor analysis and the reliability analysis were performed. In addition, prior to the hypothesis testing, correlation analysis was performed to find out the relationship between variables and simple regression analysis and multiple regression analysis were conducted for hypothesis testing. In this study, it is found that role conflict and individual-role conflict negatively affect job satisfaction and organizational commitment among the factors of role conflict and increase turnover intentions. Therefore, the hotel company would be better recognizing that and necessarily paying attention to the cooking staff, actively managing the education and improving the system. If the job satisfaction of cooking staffs and the organizational commitment would make high and make low the intention of changing job, the loyalty of organization would be increased. It would be possible to achieve positive management results for hotels, such as the activation of the hotel business, increasing sales, and additional value.
3차원 수치해석을 이용한 연약대 방향에 따른 터널 거동 특성 평가
임성빈 ( Sung Bin Yim ),정해근 ( Hae Geun Jeong ),서용석 ( Yong Seok Seo ) 대한지질공학회 2009 지질공학 Vol.19 No.1
터널 굴착 중 지반에 존재하는 연약대의 방향 특성에 따른 거동 및 응력 분포 특성을 3차원 수치해석을 이용하여 정량적으로 평가하였다. 수치모델에서 연약대의 방향은 RMR의 취약 불연속면에 대한 보정인자를 기준으로 설정되었으며, 위치는 각 방향 조건에 대하여 연약대가 천단부 상부 1D, 천단부, 막장 중앙부를 지나는 경우로 설정되었다. 지반정수는 현장 계측변위를 기반으로 하는 역해석을 통해 산정하였다. 최종적으로 터널 천단부에서 발생하는 변위의 크기를 기반으로 연약대 방향 및 위치 조건에 따른 영향도를 평가하여 5등급으로 분류하였다. A 3-D numerical analysis was carried out to observe potential effects of orientation of inherent weak zones to tunnel behaviors and stress distributions during tunnel excavation. Weak zones used for the analysis were placed at the upper 1D part from crown, on the crown and on the center of face, using orientations derived from the 6th RMR parameter for assessment of joint orientation effect on tunnel. Mechanical properties of rock mass were derived through a in-situ displacement measurement-based back analysis. Finally, a classification chart for crown settlement with five ranks based on orientation and location of weak zones is suggested.