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Appendix 2.2 Tunnel Construction Methods EPD

2010-8-6  2.2 Drill and Blast This tunnelling method involves the use of explosives. Drilling rigs are used to bore blast holes on the take longer time than the drill-and-blast tunnelling method. Appendix 2.2 Tunnel Construction Methods . Consultancy Agreement No. NEX/2301 South Island Line (East) Environmental Impact Assessment

Drill and Blast Method rail system

Drill and blast method is mostly used method for the excavation throughout the world. The method can be used in all types of rocks and the initial cost is lower than the mechanical method like TBM. This tunneling method involves the use of explosives. Compared with bored tunneling by Tunnel

(PDF) Drilling and blasting as a tunnel excavation method

Tunnel boring machine (TBM) can be used for soft rock, in the event of hard rock drill and blast method might be a better choice. Drill and blast method destructive ability often

Drill and Blast Tunneling Practices CTT consulting

2019-8-29  Drill and Blast Tunneling Practices Gerhard Girmscheid1 and Cliff Schexnayder, F.ASCE2 Abstract: High-performance drill and blast methods for tunnel construction require that each of the individual working elements that constitute the construction process are optimized and considered as a system of sequential and parallel activities.

Tunnel Construction Methods and Tunnel Construction

The West Island Line tunnel between Sai Ying Pun and Kennedy Town is constructed with the Drill and Blast method. Bored Tunnelling is a method used for long stretches of tunnel. A Tunnel Boring Machine (TBM) is used to drive and cut through the rock– the waste material is

Excavation methods: let’s compare TBM and Drill & Blast

2018-4-18  In the world of underground construction, there are two main methods for the excavation of tunnels in rock: conventional excavation methods and mechanized excavation methods. The former includes the powerful Drill & Blast technique, while the latter is best known for excavation by way of impressive Tunnel

SEMINAR ON Drill & Blast Tunnelling Safety

2017-4-5  The drill and blast method is the common construction method for tunnel project in Hong Kong. However, the safety concerns are totally difference between substructure and basement projects. It is not only based on the site enviroment, ground conditions, time frame/programme but also the budget.

Determination of the Construction Method for the Young

with a TBM than with drill and blast. 6. Conclusion : 1) A risk assessment method has been developed and applied to make a quantitative and objective assessment of the construction methods of Young Dong Tunnel. 2) The risk assessment results show that the drill and blast method would be a relatively low risk approach, whereas a shielded TBM

(PDF) Drilling and blasting as a tunnel excavation method

The drill and blast method is not only economical in comparison to mechanical methods like tunnel boring machine, road header, etc., but it can also be used to obtain varying tunnel profiles

SEMINAR ON Drill & Blast Tunnelling Safety

2017-4-5  The drill and blast method is the common construction method for tunnel project in Hong Kong. However, the safety concerns are totally difference between substructure and basement projects. It is not only based on the site enviroment, ground conditions, time frame/programme but also the budget.

Tunnel Construction Methods Civil Wale

2020-6-27  Tunnel Construction Methods Cut and cover method: The cut and cover method are used for the construction of a small or shallow tunnel. For that, a trench is excavated and the tunnel is constructed (base and side walls are made and it is roofed by concrete slabs) and cover it up.

Drill and Blast an overview ScienceDirect Topics

Construction of an almost 14 km long railroad tunnel began later that same year to extend this rail line northward beneath Lotschen Pass and onto Bern. The tunnel would be excavated from both portals using drill-and-blast methods to excavate a 2 × 2 m pilot bore, which was enlarged to a 9 m diameter twin track

Drill and Blast gold.constructionworld.in

2015-7-1  CW introduces Equipment Apps, a knowledge-sharing platform that presents case studies of construction methods and showcases application-centric equipment deployed for the same. This inaugural column focuses on the drill blast method of tunnelling in consultation with Hindustan Construction Company (HCC) Ltd.

Vibration Control in Urban Drill and Blast Tunneling

2019-7-5  most used method for tunneling in Scandinavia. Drill and blast method is a cyclical method which involves several different stages. In excavation, -the main stages are drilling, charging and blasting, venti-lating, mucking and measuring. Support methods will add some stages more. Figure 1. Cycle of drill and blast tunneling (1)

Case Study Tunnel Drill and Blast Feasibility

2011-8-4  the tunnel at up to 5.3 metres per blasted round. Such round lengths for the drilling and blasting would deliver excellent tunnelling rates that would minimise the construction time of the tunnel. Table 1 shows the predicted advance per blasted round for two possible blasthole diameters and two explosive densities that

Annex 13 Case study on tunnels Europa

2018-8-8  Conventional Tunnelling (Drill & Blast and Sequential Excavation found in very complex tunnel construction cases. Overall, the analyses and the literature review supported with conventional construction methods. Nonetheless it has to be considered that the cost-efficiency of each construction method depends on the conditions of the

Determination of the Construction Method for the Young

with a TBM than with drill and blast. 6. Conclusion : 1) A risk assessment method has been developed and applied to make a quantitative and objective assessment of the construction methods of Young Dong Tunnel. 2) The risk assessment results show that the drill and blast method would be a relatively low risk approach, whereas a shielded TBM

SELECTION OF CONSTRUCTION METHODS IN ROCK

2017-12-11  selecting the construction method. NATM is a very flexible method with respect to excavation (drill&blast or mechanical excavation), means of rock support, face support and required auxiliary measures. Excavation sequences, enlargement of excavation profiles

What is Drill And Blast Tunneling? Definition from

2017-5-24  Drill and blast tunneling is a method of excavation involving the controlled use of explosives to break rock. It was the primary means of tunneling through rock prior to the advent of tunnel boring machines. Like trenchless construction and horizontal directional drilling, drill and blast tunneling is a form of subsurface construction.

SEMINAR ON Drill & Blast Tunnelling Safety

2017-4-5  The drill and blast method is the common construction method for tunnel project in Hong Kong. However, the safety concerns are totally difference between substructure and basement projects. It is not only based on the site enviroment, ground conditions, time frame/programme but also the budget.

[PDF] Drill and Blast Tunneling Practices Semantic Scholar

High-performance drill and blast methods for tunnel construction require that each of the individual working elements that constitute the construction process are optimized and considered as a system of sequential and parallel activities. The advantage of integrating the logistic backup systems facilitates an increase in performance. To achieve increased production, it is necessary to improve

Drill and Blast Tunnelling Handbook of Tunnel

2013-10-23  The hardness, toughness and strength of the rock to be drilled determine the requirements for the drilling tools. In drill and blast tunnelling, clearance of the muck lies on the critical path, which means that each minute saved here shortens the round cycle and thus the overall construction time.

Vibration Control in Urban Drill and Blast Tunneling

2019-7-5  most used method for tunneling in Scandinavia. Drill and blast method is a cyclical method which involves several different stages. In excavation, -the main stages are drilling, charging and blasting, venti-lating, mucking and measuring. Support methods will add some stages more. Figure 1. Cycle of drill and blast tunneling (1)

Drill and Blast gold.constructionworld.in

2015-7-1  CW introduces Equipment Apps, a knowledge-sharing platform that presents case studies of construction methods and showcases application-centric equipment deployed for the same. This inaugural column focuses on the drill blast method of tunnelling in consultation with Hindustan Construction Company (HCC) Ltd.

Case Study Tunnel Drill and Blast Feasibility

2011-8-4  the tunnel at up to 5.3 metres per blasted round. Such round lengths for the drilling and blasting would deliver excellent tunnelling rates that would minimise the construction time of the tunnel. Table 1 shows the predicted advance per blasted round for two possible blasthole diameters and two explosive densities that

SELECTION OF CONSTRUCTION METHODS IN ROCK

2017-12-11  selecting the construction method. NATM is a very flexible method with respect to excavation (drill&blast or mechanical excavation), means of rock support, face support and required auxiliary measures. Excavation sequences, enlargement of excavation profiles

Determination of the Construction Method for the Young

with a TBM than with drill and blast. 6. Conclusion : 1) A risk assessment method has been developed and applied to make a quantitative and objective assessment of the construction methods of Young Dong Tunnel. 2) The risk assessment results show that the drill and blast method would be a relatively low risk approach, whereas a shielded TBM

Tunnel construction SlideShare

2019-12-18  DRILL AND BLAST 1.Before the advent of tunnel boring machines, drilling and blasting was the only economical way of excavating long tunnels through hard rock, where digging is not possible. 2.Even today, the method is still used in the construction of tunnels. 24. HOW DRILL AND BLAST IS BEING DONE. 25.