• Title/Summary/Keyword: TBM

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A Database to Estimate TBM Manufacturing Specifications and Its Statistical Analysis (TBM 제작 사양을 추정하기 위한 데이터베이스의 구축과 통계분석)

  • Chang, Soo-Ho;Park, Byungkwan;Lee, Chulho;Kang, Tae-Ho;Bae, Gyu-Jin;Choi, Soon-Wook
    • Tunnel and Underground Space
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    • v.27 no.5
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    • pp.271-281
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    • 2017
  • Generally, TBM specifications have been empirically designed by the know-hows of its manufacturers. Since they govern the excavation performance and the cost of TBMs, it is very crucial to reliably determine them in the design stage of TBMs. In this study, a database consisting of TBM data collected from a various kinds of TBM tunnel projects was built to propose the statistical correlations for estimating TBM main specifications. From the statistical analyses, TBM outer diameters are found to have a strong effect on the TBM specifications such as thrust, torque and cutterhead driving power, which are much more important than TBM types and ground conditions.

A Study on the Operation Development Method through the Application Results Large-Diameter Tunnel (대구경 터널공법 적용 사례분석을 통한 운영 개선방안)

  • Lee, Yang Kyu
    • Journal of the Society of Disaster Information
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    • v.8 no.2
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    • pp.108-118
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    • 2012
  • The application of TBM tunneling has been progressively increased since the first entrance into korea in 1985. In order to an apprehension and operation development of TBM method which has excellent boring in hard rock tunnel, this study has analyzed mutual relation of lose time and TBM boring from actual construction results TBM tunneling. This study compared this analyzed results with TBM tunnelling construction results of korea, america, japan, analyzed a primary factor of TBM boring effect and suggested operation development method from the analyzed results. accordingly this study can be used an index when contract apply TBM method to planning steps.

A Study on the Operation Development Method through the Application Result TBM Tunneling in the Bard Rock (암반터널에서의 TBM 공법 적용 사례 분석을 통한 운영 개선 방안)

  • Song, Young-Sun;Choi, Jae-Jin;Park, Hong-Tae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.4
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    • pp.1050-1058
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    • 2008
  • The application of TBM tunneling has been progressively increased since the first entrance into Korea in 1985. In order to an apprehension and operation development of TBM method which has excellent boring in hard rock tunnel, this study has analyzed mutual relation of lose time and TBM boring from actual construction result TBM tunneling. This study compared an analyzed result with TBM tunnelling construction results of Korea, America, Japan, analyzed a primary factor of TBM boring effect and suggested operation development method from the analyzed results. accordingly this study can be used an index when similar construction apply TBM method to planning steps.

A study on the selection of optimal cross section according to the ventilation system in TBM road tunnels (TBM 도로터널의 환기방식에 따른 최적단면 선정에 관한 연구)

  • Lee, Ho-Keun;Kang, Hyun-Wook;Kim, Hyun-Soo;Kim, Hong-Moon
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.15 no.2
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    • pp.135-148
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    • 2013
  • Recently, road tunnels have become longer and the plans for long and deep road tunnel have been underway in urban areas. These long and deep tunnel excavations include NATM and TBM. Shield TBM is applied to around 80% of traffic tunnels in Europe, and approximately 30% of them in other developed countries. However, as much of equipment is imported from foreign countries at high prices and distribution rate of TBM tunnel is considerably low in Korea, NATM excavation method is commonly used. To increase TBM tunnel, it is necessary to do assure economic feasibility with the supply-demand of TBM equipment. For this, the selection of standardized TBM diameter is urgently needed. Therefore, the study aims to estimate the standardized optimum section properties of TBM by examining TBM excavation cross section utilization depending on the volume of traffic, the number of lane and its cross-section type(single or double deck), and ventilation system.

Statistical Characteristics and Rational Estimation of Rock TBM Utilization (암반굴착용 TBM 가동율의 통계적 특성 및 합리적 추정에 관한 연구)

  • Ko, Tae Young;Kim, Taek Kon;Lee, Dae Hyuck
    • Tunnel and Underground Space
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    • v.29 no.5
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    • pp.356-366
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    • 2019
  • Various TBM performance prediction models have been developed and most of them were considered penetration rate only. Despite the fact that some models have suggested equations and charts for estimating the utilization factor, but there are a few studies to estimate the TBM utilization factor. Utilization factor is affected by the type of TBM machine, operation, maintenance of machine, geological conditions, contractor experience and other factors. In this study, more than 100 case studies are analyzed to determine the relationship between the utilization factor and RMR, geological conditions, TBM types, tunnel length, and TBM diameter. Simple and multiple linear regression analysis are performed to develop predictive models for the utilization factor. The predictive model with explanatory variables of geological conditions, TBM types, tunnel length, and TBM diameter does not give a good correlation. The predictive models with explanatory variable of RMR give higher values of the coefficient of determination.

A Study on Efficiency Improvement through Productivity Analysis Based on TBM Operation Data (TBM공법 적용 현장별 생산성 분석을 통한 효율성 개선 방안)

  • Park, Hong Tae;Song, Young Sun
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.30 no.1D
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    • pp.71-77
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    • 2010
  • This study presented the operation method through of productivity on eight analysis work items (TBM boring, cutter check and exchange, TBM maintenance, succeeding facilities, reinforcement in tunnel, operation alternation, a tram car) which have developed equipment at WRITH with TBM a waterway tunnel works. It was inquired lose time with analyzed result by work items and removed lose time. It was analyzed TBM boring length, TBM boring length percentage and TBM boring length time. This study analyzed TBM operation utility factor of a foreign work with TBM operation boring length percentage, a monthly average boring length, pure boring length percentage etc. and assumed a monthly average boring length and a monthly average boring length of rise forecast. Based on analyzed Data, TBM boring has been forecasted propriety pure boring length at compressive strength $675{\sim}1662kgf/cm^2$.

Tuna by-product meal as a dietary protein source replacing fishmeal in juvenile Korean rockfish Sebastes schlegeli

  • Kim, Kyoung-Duck;Jang, Ji Won;Kim, Kang-Woong;Lee, Bong-Joo;Hur, Sang Woo;Han, Hyon-Sob
    • Fisheries and Aquatic Sciences
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    • v.21 no.8
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    • pp.29.1-29.8
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    • 2018
  • This study was conducted to evaluate the use of tuna by-product meal (TBM) as a substitute for fishmeal in juvenile Korean rockfish (Sebastes schlegeli) diets. Five isonitrogenous (52% crude protein) and isocaloric (4.9 kcal/g) diets were prepared. Control diet (Con) was formulated to contain brown fishmeal, whereas 25, 50, 75, and 100% of fishmeal was substituted with the same percentage of TBM in the TBM25, TBM50, TBM75, and TBM100 diets, respectively. Three replicate groups of fish (initial weight, $29.5{\pm}0.6g$) were fed one of the five diets for 12 weeks. The mean weight gain of fish fed the Con and TBM25 diets was significantly higher than that of fish fed the TBM100 diet (P < 0.05), but it was not significantly different from the weight gain of fish fed the TBM50 and TBM75 diets. The feed efficiency and protein efficiency ratios of fish fed the Con diet were significantly higher than those of fish fed the TBM100 diet (P < 0.05), but were not significantly different from those fed the TBM25, TBM50, and TBM75 diets. The TBM25, TBM50, TBM75, and TBM100 diets had significantly (P < 0.05) lower incidence cost and higher profit index than the Con diet. These results suggest that the tuna by-product meal used in this study could replace up to 75% of fishmeal protein in the diet without reducing growth and feed utilization in juvenile Korean rockfish weighing 29-53 g. By considering feed cost, the TBM 75 diet is recommendable for Korean rockfish farming.

A Study on the Excavation Efficiency in Rock Mass Applied TBM Method (TBM공법을 적용한 암반현장에서의 굴착효율에 관한 연구)

  • Jeong, Hyeong-Sik;Lee, Seung-Ho;Park, Jong-Bae
    • Geotechnical Engineering
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    • v.11 no.1
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    • pp.51-62
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    • 1995
  • The use of TBM has been rapidly increased in recent years since TBM has been introduced to Korea in 1985 and Korea came to occupy 27% of TBM holding ratio in the world. Despite a lot of experience, study on promoting the efficiency of TBM excavation is insufficient. The factors that influence the efficiency of excavation are the mechanical farttor geotechnical factor and management factor. The study on the efficiency of excavation has focused on the improvement of mechanical factor. But geotechnical factor is also very important and by this factor engineer can estimate the applicability of TBM. The purpose of this paper is to understand the effectiveness of TBM excavation for vari orts rock quality by analysing relations between rock quality and TBM excavation.

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The $Mer{\aa}ker$ TBM Project in Norway (노르웨이 메로케르 수력발전소의 TBM 굴착)

  • Park Yeonjun;Park Chulwhan
    • Tunnel and Underground Space
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    • v.15 no.1
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    • pp.22-27
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    • 2005
  • This paper presents an article explaining a TBM project overall in Norway. The paper which published in Norwegian TBM Tunnelling by Norwegian Soil and Rock Eng. Assoc. in 1998, contains most of the items considered in TBM tunnelling. New powerplants, tunnels and dams have been built at Meraker in Central Norway. A total of 44 km of tunnels with cross sections varying from $7\;m^2\;to\;32\;m^2$ have been excavated in hard rock formation. Tunnel of 10 km with the 3.5 m diameter was excavated by a HP TBM in a year. his project gives the special attention to the TBM drive and equipment selection, including planning, site organization and performance.