scholarly journals Geological Conditions at Preliminary Tunnel Design Stage and Construction Stage: An Evaluation and Assessment.

2000 ◽  
pp. 33-43 ◽  
Author(s):  
Koji NAKAGAWA ◽  
Tetsuharu YASUOKA ◽  
Haruo KITAMURA ◽  
Sigeru MIKI ◽  
Mutsumi FUJIMOTO ◽  
...  
Keyword(s):  
Design Stage ◽  
Construction Stage ◽  
Geological Conditions ◽  
Tunnel Design ◽  
Evaluation And Assessment

Application of rock cover alteration ratio concept in preliminary design of unlined pressure tunnels

2011 ◽  
Vol 48 (11) ◽  
pp. 1674-1682
Author(s):  
André J. Rancourt ◽  
Hani Mitri
Keyword(s):  
Field Measurements ◽  
Shear Zones ◽  
Design Criterion ◽  
Design Stage ◽  
Preliminary Design ◽  
Rock Cover ◽  
Geological Conditions ◽  
Preliminary Design Stage ◽  
Minimum Stress ◽  
Hydraulic Jacking

Unlined pressure tunnels were first driven by the Norwegians into hard granitic rock, which is the ideal material for this type of structure. However, the increase in demand for electric power has propelled the industry to develop projects at sites all over the world with less favourable geological conditions. The paper places emphasis on the preliminary design phase when no field measurements are available. A recent study by Rancourt (published in 2010) has investigated the spatial distribution of the minimum stress that is required to control hydraulic jacking around unlined pressure tunnels. Various surface topographic profiles including slopes, hills, and valleys; the rock cover to tunnel diameter ratio; as well as the presence of geological features such as shear zones and dykes were investigated with numerical modelling. Effective rock cover predictions are compared to those given by the well-known Norwegian design criterion, and a correction factor called cover alteration ratio (CAR) has been introduced. In this paper, a design methodology is proposed for use of CAR at the preliminary design stage in the form of a factor of safety against hydraulic jacking to be used in conjunction with the Norwegian criterion. Limitations on the use of the Norwegian criterion are highlighted.

scholarly journals COMPARING THE PLANNING AND PERFORMANCE OF DIRECT LABOUR AND DESIGN-BID-BUILD CONSTRUCTION PROJECTS IN NIGERIA / PLANAVIMO IR VEIKLOS EFEKTYVUMO PALYGINIMAS, NIGERIJOS STATYBŲ PROJEKTUOSE NAUDOJANT TIESIOGINĮ DARBĄ IR TAIKANT TRADICINĮ PIRKIMŲ METODĄ

2012 ◽  
Vol 18 (2) ◽  
pp. 184-196 ◽  
Author(s):  
Godwin Iroroakpo Idoro
Keyword(s):  
Construction Projects ◽  
T Test ◽  
Design Stage ◽  
Construction Planning ◽  
Construction Stage ◽  
Cost Overruns ◽  
And Performance ◽  
Design Bid Build ◽  
Design And Construction

This study compares the levels of planning and the outcome of projects procured by direct labour and traditional contract procurement options. For this comparison, a survey of 130 projects was carried out. Data were collected using structured questionnaires and analysed using percentage, mean and t-test. The study discovers that whereas the levels of conception and overall planning done in projects procured by the two options are the same, the levels of design and construction planning done in DBB and DL projects differ. The study also discovers that the time-overruns of projects procured by the two methods differ but their cost-overruns are the same. The study concludes that projects procured by DBB and DL options differ in planning and time-overrun and suggests improved planning at the design stage when DL option is adopted and improved planning at the construction stage when DBB option is adopted. Santrauka Šiame darbe lyginami planavimo lygiai ir projektų rezultatai, kai naudojamas tiesioginis darbas ir taikomas tradicinis pirkimų metodas (projektavimas–konkursas–statyba; angl. Design-Bid-Build, D-B-B). Palyginimui atlikta 130 projektų apklausa. Duomenys surinkti naudojant tam tikros struktūros anketas ir išanalizuoti pagal procentus, vidurkius ir t testą. Atliekant tyrimą nustatyta, kad abiem paslaugų pirkimo atvejais projektų sumanymo etapas ir bendras planavimas yra vienodo lygio, tačiau tradicinį pirkimų metodą pasirinkusiuose projektuose projektavimo ir statybų planavimo etapų lygis skiriasi nuo tiesioginį darbą pasirinkusių projektų etapų lygio. Atliekant tyrimą paaiškėjo, kad abiem atvejais laikas viršijimas skirtingai, tačiau sąnaudos viršijamos vienodai. Daroma išvada, kad projektams taikant skirtingus pirkimo būdus (tradicinį metodą arba tiesioginio darbo variantą) skiriasi planavimas ir vėlavimas; taip pat siūloma, kaip pagerinti projektavimo etapo planavimą, kai naudojamas tiesioginio darbo variantas, ir kaip pagerinti statybų etapo planavimą, kai taikomas tradicinis metodas.

Research on the rework risk core tasks in prefabricated construction in China

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Kaicheng Shen ◽  
Xiaodong Li ◽  
Xinying Cao ◽  
Zhang Zhihui
Keyword(s):  
Questionnaire Survey ◽  
Risk Function ◽  
Design Stage ◽  
Future Research ◽  
Clear Understanding ◽  
Expert Interviews ◽  
Construction Stage ◽  
Content Type ◽  
The Core ◽  
Manufacturing Stage

PurposeThe purpose of this paper is to assess the process of prefabricated construction (PC) and analyze the impacts of rework risk to identify the core tasks for which the rework risk has severe impacts.Design/methodology/approachThe methods consist of a literature review, expert interviews, a questionnaire survey and a rework risk function. The expert interviews and questionnaire survey were administered to experts in the entire process of PC from the dimensions of rework frequency, rework cost and rework time. Descriptive and inferential statistics were employed to analyze the data. The rework risk function was based on the loss expectancy method.FindingsThere are 13 core tasks that have higher impacts than the average level. The core tasks in the design stage account for 100% of the tasks in the stage, those in the manufacturing stage account for 20% and those in the construction stage account for 23.1%. Compared with the other stages, the design stage is characterized by significantly more frequent rework, higher rework costs and longer rework time. The manufacturing stage is characterized by significantly higher rework costs than the construction stage. The manufacturing stage and construction stage are co-reliant, and both are impacted by the design stage.Practical implicationsThe findings provide stakeholders with a clear understanding of the core tasks of the PC process and represent a method for identifying core tasks. Stakeholders can learn from this to focus on the core tasks to reduce rework risk and manage the process with the priority of PC rework management based on the following order: design > manufacturing > construction. The approach is suitable for core task identification in other areas.Originality/valueThis research provides insight into rework risk management and provides a novel analysis method for rework risk and PC management from the perspective of the construction process. The findings are valuable for supporting stakeholders in making effective construction plans to reduce the impacts of rework risk in PC and provide a reference for future research on process optimization.

Investigation of Energy Risk in Pre-Construction Stage: A Qualitative Approach

2021 ◽  
Vol 15 (S1) ◽  
pp. 39-45
Author(s):  
Mohammad Syabilee Nikman Lee ◽  
Sulzakimin Mohamed ◽  
Roshartini Omar ◽  
Norliana Sarpin ◽  
Haryati Shafii ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Energy Demand ◽  
Structured Interview ◽  
Design Stage ◽  
Building Performance ◽  
Design Strategies ◽  
Construction Stage ◽  
Planning Stage ◽  
Potential Impact ◽  
The Impact

The energy demand growth every year for existing building due to the natural lifecycle of the building performance. Systematic strategy in retrofitting is proven to revamp the energy building performance. However, the retrofitting process is facing several of unknown risk as early in pre-construction stage to achieve optimum energy efficiency design strategy. The risk requires strategic assessment to minimize the impact towards the efficiency level in retrofitting. This study aims to examine the risks and the potential impact towards design strategies by conducting a semi-structured interview from six internal stakeholders in the retrofit project. The result derived from the interview revealed that there are 13 of major risks involve in retrofit project and divided into planning stage and design stage. All the risks are proven to provide a potential impact towards energy efficiency design strategies.

Engineering Geological Condition Analysis of some Beijing Engineering

2012 ◽  
Vol 446-449 ◽  
pp. 1989-1992
Author(s):  
Yun Long Shangguan ◽  
Qing Wang ◽  
Cen Cen Niu ◽  
Ke Wang ◽  
Yan Ge Zhang
Keyword(s):  
High Speed ◽  
Geological Condition ◽  
Engineering Geological Condition ◽  
Geological Environment ◽  
Rock Blasting ◽  
Tunnel Excavation ◽  
High Speed Railway ◽  
Geological Conditions ◽  
Tunnel Design ◽  
Railway Engineering

With the high speed railway construction in our country, the launch of the railway engineering will inevitably lead to all kinds of engineering geological problems, resulting in the construction and operation of landslides, sudden gushing mud, rock blasting and other diseases. So with geological environment and engineering geological conditions of the station tunnel excavation , analysis and evaluate the influence of the engineering geological conditions of the tunnel, put forward the measures and suggestions for the engineering, and provide the basis for tunnel design and construction .

scholarly journals Methodological approach for a sustainable management of water inflow and geothermal energy in tunnels

2015 ◽  
Vol 4 (3) ◽  
Author(s):  
Fabio Furno ◽  
Marco Barla ◽  
Antonio Dematteis ◽  
Stefano Lo Russo
Keyword(s):  
Geothermal Energy ◽  
Sustainable Management ◽  
Cold Water ◽  
Methodological Approach ◽  
Relevant Information ◽  
Water Inflow ◽  
Design Stage ◽  
Geothermal Resources ◽  
Tunnel Design

It is quite unusual to consider the exploitation of geothermal resources during at the tunnel design stage. This paper is intended to analyse the nature and the potential of the geothermal resources. These are essentially the hot or cold water inflow and the temperature of the surrounding ground itself. A methodological approach is proposed to face the problem, determine relevant information and estimate the attractiveness of the application. The approach is then applied to the case study of the metro line Dudullu-Bostanci in Istanbul, currently under design, by identifying a possible application of heat exchangers integrated into the tunnel lining and evaluating preliminarily the environmental and economical aspects.

scholarly journals Study on Electrical Characteristics of Magmatic Rock Intrusions in Metamorphic Rock Formations—Taking the Mupi Tunnel of Jiuzhaigou-Mianyang Highway as an Example

2021 ◽  
Author(s):  
Bin Li ◽  
Chongde Feng ◽  
Qiang Cheng ◽  
Jianhua Yu ◽  
Hu Zhao ◽  
...  
Keyword(s):  
Metamorphic Rock ◽  
Ground Level ◽  
Magmatic Rock ◽  
Western China ◽  
Contact Boundary ◽  
Electrical Characteristics ◽  
Highway Tunnel ◽  
Geological Conditions ◽  
Tunnel Design ◽  
Design And Construction

Abstract The stratum lithology and geological structure of the highway tunnel in the mountainous areas of western China are complex, and the engineering geological conditions are complicated. When the highway tunnel passes through different lithological strata, its structural design and construction are completely different. Therefore, the design and construction of the supporting tunnel are used in the tunnel survey. The identification of the contact boundary between magmatic rock and metamorphic rock and the grade of surrounding rock is very important. The data processing, forward numerical simulation, 1D, 2D, and 3D inversion of the G8513 Jiuzhaigou-Mianyang Expressway Mupi Tunnel survey by magnetotelluric method reveals the ground level along the design line of the tunnel to the depth of 50m depths within the design elevation of the tunnel. Electrical characteristics, focusing on the identification of the contact boundary between magmatic rock and metamorphic rock. This study provides the electrical characteristics of the magmatic rock and metamorphic rock contact boundary of the Mupi Tunnel. It is speculated that the boundary is revealed by the tunnel construction excavation, which verifies the correctness of the geophysical inversion model and provides a more detailed design basis for the tunnel design. It is believed that taking the Mupi tunnel survey as an example, this research can provide detailed geophysical basis for the identification of magmatic rock and metamorphic rock in highway tunnels, as well as the geological survey and design of highway tunnels.

scholarly journals A Study of the Effects of Geological Conditions on Korean Tunnel Construction Time Using the Updated NTNU Drill and Blast Prediction Model

2021 ◽  
Vol 11 (21) ◽  
pp. 10096
Author(s):  
Yangkyun Kim ◽  
Sean Seungwon Lee
Keyword(s):  
Rock Mass ◽  
Prediction Model ◽  
Rock Properties ◽  
Design Stage ◽  
Construction Time ◽  
Tunnel Support ◽  
Advance Rate ◽  
Rock Mass Quality ◽  
Geological Conditions ◽  
Drill And Blast

This paper analyses the construction time and advance rate of a 3 km long drill and blast tunnel under various geological conditions using an upgraded NTNU drill and blast prediction model. The analysis was carried out for the five types of Korean tunnel supports according to the rock mass quality (from Type 1, meaning a very good rock mass quality; to Type 5, meaning a very poor rock mass quality). Four kinds of rock properties, as well as the rock mass quality, for each tunnel support type were applied to simulate different geological conditions based on previous studies and the NTNU model. The construction time was classified into five categories: basic, standard, gross, tunnel and total, according to the operation characteristics to more effectively analyse the time. In addition, to consider the actual geological conditions in tunnelling, the construction times for the three mixed geological cases were analysed. It was found that total construction time of a tunnel covering all the operations and site preparations with a very poor rock mass quality was more than twice that of a tunnel with a very good rock mass quality for the same tunnel length. It is thought that this study can be a useful approach to estimating the construction time and advance rate in the planning or design stage of a drill and blast tunnel.

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