A study on the establishment of Tunnel Contour Quality Index considering construction cost

Kim, Yangkyun; Bruland, Amund

doi:10.1016/j.tust.2015.07.010

Cited by 15 publications

(5 citation statements)

References 2 publications

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“…e drill-blast method has been extensively applicable in rock tunnelling owing to its flexibility and compatibility under complicated geological conditions. In the case of drill-blast excavation, the opening tunnel contour and damage caused by blasting will affect not only the cost and advancement rate of tunnelling but also the stability of surrounding rocks [1][2][3][4]. In view of this, the smooth blasting technique, as a protective controlled blasting method, has been increasingly employed to minimize the magnitude of overbreak or underbreak and thus to reduce the blastinginduced cracking in the surrounding rock masses [5,6].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Influential Factors for Quality of Smooth Blasting in Rock Tunnels

Zou

Wang

et al. 2020

Advances in Civil Engineering

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The quality of smooth blasting including the volume of over-/underbreak and blasting-induced damage of surrounding rocks has been extensively considered to be highly correlated to both the cost and advancement rate of rock tunnelling excavated by the drill-blast method. A general control strategy for smooth blasting is too difficult to be available due to the uncertainties and complexity of rock masses, as well as the varying blasting operations. As prerequisite for the evaluation of the blasting quality, effective identification of the influential factors affecting smooth blasting usually plays a significant role in the improvement of smooth blasting design. Compared to the expensive and time-consuming experiments including physical modelling and field tests, numerical modelling, as a cost-efficient approach, offers an attractive alternative to investigate the influential factors in terms of weight, which might be more applicable and reliable for the optimization of smooth blasting parameters. In this case, the dominant factors and secondary factors can be quantitatively identified. Considering the dominant factors often orient the development of things; in this work, a numerical-based approach was proposed to quantitatively identify the dominant factors influencing the quality of smooth blasting. Proposed 3-dimensional blasting modelling was based on LS-DYNA to simulate the occurrence of smooth blasting in rock masses, and the erosion algorithm was also employed to determine the fracturing of jointed rocks. The orthogonal experimental design method was utilized to optimize the experimental arrangement. Seven factors with 4 levels including the perimeter hole spacing, line of least resistance, charge concentration, charging explosive, type of rock mass, detonation velocity, and drilling deviation were taken into account. The geological setting and project background of a real rock tunnel served for the Chengdu-Chongqing high-speed railway were selected as the site conditions to perform the numerical investigation. Calculated area and distance of overbreak as the observed parameters indicating the quality of smooth blasting were utilized to determine sensitivities of factors based on the range analysis of orthogonal experiments. The results suggested that the type of rock mass has the greatest influence on the blasting quality, whereas the charge concentration and detonation velocity can be considered as the secondary factors under the specific site conditions. The proposed numerical approach for assessing influential factors of quality of smooth blasting under specified geological conditions is expected to improve the parameter design and operation of smooth blasting in practical applications.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Influential Factors for Quality of Smooth Blasting in Rock Tunnels

Zou

Wang

et al. 2020

Advances in Civil Engineering

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“…It appears that the aforementioned contact phenomenon is important for the safety of the structure [28]. Thus, apart from the economic aspect [29], the TCI can also potentially become a useful tool for evaluation of the geotechnical and safety aspects of the structure.…”

Section: Using the Tci In The Engineering Practicementioning

confidence: 99%

Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data

Dybeł

Cieślik

2021

Studia Geotechnica Et Mechanica

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The Tunnel Contour Quality Index (TCI) is an index established by Kim and Bruland for an effective management of a tunnel contour quality. It is estimated on a basis of measurements of two contour profiles within a single blasting round, using a laser profiler. However, the representativeness of measurement results obtained that way for the assessment of a contour quality of the entire blasting round is disputable. Terrestrial laser scanning (TLS) technology, combined with available numerical surface modeling tools, enables development of three-dimensional models of a monitored surface. The article reports results of TCI calculations based on TLS data. The presented TLS technique is based not only on selected cross-sections of the tunnel contour but also on the description of the morphology of the tunnel contour surface. The case study concerns measurements of the “Mały Luboń” tunnel niche, located in Naprawa, Poland. The TCI values for three blasting rounds were determined in accordance with Kim and Bruland's guidelines and were compared to TCI values determined with the proposed TLS technique. On a basis of this comparison, it can be concluded that the results obtained with the TLS technique are more reliable and representative for description of the contour quality of the entire blasting round than results obtained with the laser profiling technique.

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“…If the autocorrelation coefficients on the graph gradually decays to zero, it is regarded as stationary time series. If the time series is not smooth, you need first to sequence extraction cycle trend item or items, so the sequence becomes stable, then for subsequent analysis [3].…”

Section: Time Series Prediction Theorymentioning

confidence: 99%

Research on Prediction of Architectural Engineering Cost based on the Time Series Method

Zhang¹

2015

Proceedings of the 2015 3rd International Conference on Machinery, Materials and Information Technology Applications

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Cost plays a very important role in architectural engineering, and the methods to predict the cost rapidly and accurately are needed. On the basis of the valuation mode of quantities bill, this paper proposed the time series method for predicting project cost. According ti the theory of test, modeling and prediction, the paper carried out time series analysis, taking steel price for example. It withdrew the steel price tendency item, then conducted modeling using the price residual item, finally established the model of steel price. In line with the model, the steel price of the first quarter in 2014 was forecast. By comparing with the real price, it shows that the error was in 5 percent, which proves the model is correct and the time series method based on the valuation mode of quantities bill can be adopted widely to predict manufacturing cost.

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A study on the establishment of Tunnel Contour Quality Index considering construction cost

Cited by 15 publications

References 2 publications

Numerical Investigation on Influential Factors for Quality of Smooth Blasting in Rock Tunnels

Numerical Investigation on Influential Factors for Quality of Smooth Blasting in Rock Tunnels

Evaluation of Tunnel Contour Quality Index on the Basis of Terrestrial Laser Scanning Data

Research on Prediction of Architectural Engineering Cost based on the Time Series Method

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