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현장계측과 수치해석에 의한 쉴드TBM 터널의 지표침하 예측모델
김승철,안성율,이송,노태길,Kim, Seung-Chul,Ahn, Sung-Youll,Lee, Song,Noh, Tae-Kil 한국터널지하공간학회 2013 한국터널지하공간학회논문집 Vol.15 No.3
본 연구는 쉴드 TBM을 적용한 국내 지하철 현장의 계측 자료를 분석하고 기존 이론식에 의한 모델 및 수치해석 결과와의 비교를 통해 보다 간편한 지표침하 예측 S-모델을 개발하였다. 이를 위해 전체 굴착 구간 중, 대표 station을 선정하여 횡방향 지표침하 특성과 굴착 진행에 따른 종방향 지표침하 특성을 분석하였다. 분석 결과를 바탕으로 횡방향 지표침하 형태는 이완영역과 탄성영역으로 구성된다고 가정하고 실제 계측 자료와의 비교를 통해 최대 지표침하량과 침하 영향 범위를 산정할 수 있는 모델을 제안하였다. 이에 의하면 굴착 진행에 따른 종방향 지표침하 형태는 3차 함수 특성과 유사하였으며 각각의 계수를 터널 직경 및 토피고의 함수로 하여 S-모델을 제안하였고, 실제 계측 값 및 수치해석 결과와 상당히 유사한 형태의 지표침하를 얻을 수 있었다. 따라서 본 연구결과를 통해 다소 연약한 풍화토, 풍화암 지층을 통과하는 쉴드 TBM 굴착 시공 시, 간편 S-모델을 이용하여 굴착에 따른 지표침하의 예측이 가능할 것으로 판단된다. In this study, more convenient model(S-model) for predicting ground surface settlement is developed through comparing field monitoring data of the domestic subway applied shield TBM method with conventional equation & numerical analysis. Sample stations are chosen from whole of excavation section and lateral & vertical ground surface settlement characteristic with excavation are analysed. Based on analysis result, through the comparison with actual monitoring data, the model that is possible to compute maximum surface settlement and settlement influence area is suggested with assumption that lateral surface settlement forms are composed relaxed zone and elastic zone. In addition, vertical ground surface settlement patterns with excavation are similar to cubic-function and S-model with assumption that coefficients are function of tunnel diameter and depth is suggested. Consequently, the ground surface settlement patterns are significantly similar to actual monitoring data and numerical method result. Thus, as a result, when tunnels are excavated using sheild TBM through rather soft weathered soil & rock layer, prediction of ground surface settlement with excavation using convenient S-model is practicable.
김승철(Seung-Chul Kim),조창민(Chang-Min Cho),정성종(Sung-Chong Chung) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Identification of servo parameters is critical to fabricate a precision machinery. In this paper, servo characteristics of a linear motor driven servo systems are estimated through the frequency response, ripple force identification and nonlinear friction identification methods. Linear element of the servo is identified through the sine sweeping. Ripple forces are identified through the harmonic fitting method. Nonlinear characteristics of static, Coulomb and viscous frictions are estimated through the current measurement. To verify the reliability of the estimated servo model, real-time experiments are conducted on the linear servo for linear and sinusoidal motion experiments. Experimental results confirm the effectiveness of the developed identification method of linear servos.
차체 구조용 섬유직물 복합재의 평면 전단(mode Ⅱ) 층간분리 거동에 대한 시험적 연구
김승철(Seung-chul Kim),김정석(Jung Seok Kim),윤혁진(Hyuk Jin Yoon),서승일(Sung-Il Seo) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
Mode Ⅱ interlaminar fracture toughness was measured and fractured surfaces were observed of carbon/epoxy and glass/epoxy woven fabric composites for carbody structure. Woven fabric carbon/epoxy and glass/epoxy composites that made with prepreg and epoxy resin(RS1222) are used in carbody structure of Korean tilting train(TTX) and low floor bus. ENF(End Notched Flexure) specimens having 120㎜ × 20m × 5㎜ shape and 35㎜ initial crack were made with each composites and three point bending tests according to ASTM D790 were conducted for these specimens. Crack lengths in tests were recorded using optical microscope and digital camcorder. NL(Non Linear), 5% offset and Max. load points in load -displacement curves were checked and mode II interlaminar fracture toughness of these points were calculated and compared. Fractured surfaces of specimens were observed using optical microscope and mode Ⅱ delamination behavior of each composites was discussed.
열수변질에 의한 깊은 풍화대 발달지역 도시철도 설계사례 연구
김승철(Kim Seung Chul),송용규(Song Yong Kyu),문홍년(Mun Hong Nyeon),최성순(Choi Sung Soon) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5
화강암은 우리나라에 분포하는 주요 암석이며, 생성 이후 추가로 화성활동의 영향을 받은 부분은 열수변질 작용에 의해 깊은 풍화대를 형성하기도 한다. 열수변질은 마그마 분화과정에서 생기는 뜨거운 물이 주변에 존재하는 화강암 내의 일부 광물에 대해 용탈작용으로 입자간의 결합력을 약화시켜 암석의 강도를 저하 시킨다. 이로 인해 일부 토목 현장에서는 깊은 심도에서도 지층의 급변현상과 강도저하로 지반조건이 불량해져 터널 굴착시 안정성에 문제가 발생할 수 있다. 본 논문은 김포 도시철도 화강암 분포 구간 중 열수변질에 의한 깊은 풍화대가 발달한 지역을 통과하는 도시철도 터널설계 사례로서 지반조사를 통해 파악한 열수변질 풍화대의 분포 및 공학적 특성을 분석하고, 이를 고려한 보조공법 적용 및 지보재 강성증대 등의 터널안정성 확보방안에 대하여 기술하고자 한다. Granite is one of the major rock in Korea. The portion of the granitic rock affected by additional volcanic activity may be translated into deep weathered zone on account of hydrothermal alteration which is that hot water formed in the magma’s differential process leaches some minerals of the nearby rocks, so weakens the coherence between the grains and finally lower the strength of the rock. In some civil engineering fields, we frequently meet the deep weathered zones having severe variations in ground condition due to hydrothermal alteration. Such a poor ground may cause safety problems in tunnel excavation. This paper is a case study of Kimpo subway tunnel design which go through the alteration zone. We study the distribution and characteristics of that zone, and the adoption of auxiliary tunnel reinforcement method and use of stiffer material for securing of safety.
한국형 고속전철 연결링의 주행시 응력변화에 대한 안정성 평가
김승철(Seung Chul Kim),이용우(Yong-Woo Lee),서승일(Sung-Il Seo) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The connecting ring of Korea High Speed Train(KHST) have been evaluated the safety for fluctuating strain when it was driving. The strain gauges are mounted on the weak points of the connecting ring. We proceed the spectrum analysis for each weak points using the evaluated fluctuating strain data both on the high speed line and on the conventional line. The result from comparison between the high speed line and the conventional line data shows that the travelling on the high speed line receive bigger strain than the conventional line. Also, the car body joint sections and the side of the connecting ring receive the strong strain.
배드민턴 헤어핀 동작 시 숙련도에 따른 동작의 일관성과 타이밍의 차이
김승철(Kim, Sang-Bum),김상범(Kim, Seung-Chul) 한국사회체육학회 2016 한국사회체육학회지 Vol.0 No.64
The objective of this research is to do a comparative analysis of Differences of Movement Consistency and Timing during Badminton Hairpin between experts & novices, and to present the basic data to improve the technical level of movement. The experiment was progressed by 7 experts and 7 amateurs, and 40 tasks were performed including 20 times of forehand hairpin and 20 times of backhand hairpin. The subject’s movement consistency was analyzed by the position of foreleg when finishing hairpin movement, beating point of shuttlecock and time rate per interval according to all exercise time, and the consistency of two-dimensional task was calculated by two way variable error, while one dimensional consistency was by variable error. For the performance timing, forehand hairpin was divided by 1st section(one step section), 2nd section(slide step section) , 3rd section(two step section), while backhand hairpin by 1st section(one step section), 2nd section(two step section) to measure all exercise time and exercise time per section. With the calculated data, we did independent t-test, and the result of this research is as follows. Result, expert had the high consistency of exercise performance than the amateur, the expert had consistent time rate in 3rd section, while the amateur in the 2nd section. also, the expert had the longer exercise time and exercise time per section than the amateur.