The different types of controlled blasting techniques are presplitting, smooth blasting, line drilling, perimeter blasting, and cushion blasting. The drill and blast method is when a small drill is used to make bore holes where the explosives are inserted to blast away the material. Bored tunnelling is a method used for long stretches of tunnel. It also points out that shock absorption should be adopted in the construction. The second technique, shown in the diagram below, is the topheading and bench method. For example, in central stockholm blasted tunnels are being constructed presently for both road and rail use. Nonetheless it has to be considered that the costefficiency of each construction method depends on the conditions of the ground as well as on projectdesign features. It puts forward the construction control measures of overexcavation and undercut in process of construction with drilling and blasting method of multiarch tunnel, and analyzed the effect of the blasting vibration to middle wall and supporting structure. Many methods followed the traditional quantity takeoff format termed. Handbook of tunnel engineering, volume i structures and methods. Preliminary ventilation and cooling during the construction. The use of tunnel form produces high quality monolithic structures. Study and quantification of tunnel works by drilling and blasting method. Drill andblast method the advancement of long tunnels through hard rock well before tunnel boring machines tbms were invented relied entirely on the drill andblast method.
It involves cutting rock by a full face boring machines. In tunnel construction, we differentiate between two excavation methods. The drill and blast tunnel method is not always considered to be an option. Drilling and blasti ng is the controlled use o f explosiv es and ot her meth ods such as gas pre ssure bla sting pyrotechnics, to break rock for excavation. Tunnel construction methods and tunnel construction projects in hong kong. Explosives and timed detonators delay detonatorsare then placed in the blast holes. Tunnelling machines for partial face roadheader are also used for rock excavation. Different procedures exist, from manual to completely mechanised. The basic principles of blasting method, blasting geometry, charge structure, drill andblast parameters of. Uralasbest when blast holes are drilled with rollertype drill rig. Drill and blast method is a widely used method in tunneling. The conventional tunneling method is a cyclical process of tunnel construction that involves excavation by drilling and blasting or by mechanical excavators except the fullface tunnel boring machine tbm. Drilling and blasting hard granite at upper beaconsfield duration.
Further, the drill and blast method is characterized by a short mobilization time requirement due to the use of standard equipment. Excavation process drilling, blasting, excavation youtube. Tunnel lining assembled by precast segments tunnel boring construction method what is a tbm. In the last chapter a few challenging tunnelling projects with good vibration control practises are presented. Tunnels constructed with tbm tend to be slightly higher in cost than those constructed with conventional construction methods. Potential environmental impacts that could result from its construction, as well as mitigation measures to lessen their effects, are discussed in subsequent technical chapters. Tunnel excavation was specified as the hand mined method using controlled drilling and blasting.
This paper based on a highway reconstruction projects. A tunnel boring machine tbm is used to drive and cut through the rock the waste. The basic principles of blasting method, blasting geometry, charge structure, drillandblast parameters of. Bradshaw construction used the drill and blast hand mine method to successfully install a combined spill way. It was the primary means of tunneling through rock prior to the advent of tunnel boring machines. Drill and blast this tunnelling method involves the use of explosives.
Description of construction methods and activities. The field work conducted at three sites along the proposed tunnel line involved the firing of 46 individual charges below the ground and had masses between. This is followed by application of an appropriate primary support. Furthermore, the affect of the swell factor of soil. Drill and blast method is mostly used method for the excavation throughout the world. A summary of environmental merits and demerits associated with these methods are also given. Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for excavation. Shafts are also used in civil construction projects. Estimation model for advance rate in drill and blast tunnelling. Tunnel boring machine tbm a tunnel boring machine tbm also known as a mole, is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. For the drill and blast method, the study shows increased performance for two simultaneously drilled tunnels when compared with a single one. Program summaru the program reported herein is a study of an unusual spiral tunnel face geometry, conceived to permit continuous drill and blast tunneling progress. Types of tunnels shallowburiedtunnel or soft soil tunnel.
Tunnel construction and tunnel engineering is considered to be one of the most sophisticated and specialized art in the field of civil engineering. The choice of excavation method depends on various factors e. Hardrock tunnel boring machines wiley online library. A tunnel construction is an underground passage provided beneath earth surface or water. These are conventional drill and blast and fullface boring, tbm. Although tbms are mostly used in tunnel construction, there are those who think. In the past, the blast engineer went up and down to the face with the drill plans, said johan jonsson of atlas copco. It involves drilling charge holes advancing into rocks and using explosives to blast the rocks. This study has been done for one of boliden mineral abs mines in sweden. In 1976, after the successful completion of the first section of the main sewage tunnel system lysaker majorstua, the tender documents for the.
Senior construction advisor, atlas copco rock drills ab. Tunnel form construction technique was invented over 50 years ago. Oct 05, 2012 practical tunnel construction is an important resource for students, construction managers, tunnel designers, municipal engineers, or engineers who are employed by government agencies or corporations that are exploring the feasibility of planning and designing or building a tunnel. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction. The total labor cost for drill and blast tunneling is high, but the total investment cost is less as. During the construction of the brenner base tunnel, the transportation of the. The drill and blast method is used in hard rock where boring with a tbm is difficult. Typical blasting methods for structural engineering. After discussing the processes of drilling, blasting and mucking, and highlighting the effects of blasting on the surroundings. A tunnel boring machine tbm is used to drive and cut through the rock the waste material is transported to the back of the tbm for disposal. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road con struction. It eliminates the use of any subsequent wet trades plastering etc.
Tunnel construction methods and their comparison mining and. Seminar on safety in tunnelling using drillandblast method. Mar 19, 2018 isometric explainer animation for drill and blast tunneling method. We offer extensive experience in shaft sinking and tunnel excavation and have an intimate knowledge of a wide range of excavation techniques, including the new austrian tunneling method sequential excavation method natmsem, tunnel boring machines tbm and conventional drill and blast techniques. Cost against diameter for cut and cover and drill and blast methods. Description of construction methods and activities a. The construction of a new utility tunnel associated with its hospital operations at the mcgill universitys downtown montreal campus that started in may 2014 and finished in april 2015 was carried out using drill and blast method. Ppt study and quantification of tunnel works by drilling. The choice of tunnelling method may be dictated by. Models for the analysis of tunnelling construction processes 3 of drill jumbos, number of platform trucks, and number of excavators. The program consisted of a feasibility study of the spiral blast. Tunnels, shaft and development headings blast design introduction tunnels, shafts, and raises are developed for a variety of purposes. Pdf drilling and blasting as a tunnel excavation method. Pdf on jan 1, 2000, ozgur satici and others published drilling and blasting a s a tunnel excavation method find, read and cite all the research you need on researchgate.
Tunnel construction by a tbm begins with the excavation, then disposal of cuttings from the tunnel face, tunnel lining, and finally extending the services and rail tracks. Traditionally, atbmwillbenamedafter lady tunnel boring. In this report, an effort has been made to examine and evaluate the current tunnel construction technologies employed in different mediums. Base data essential base data of ventilation cooling design. Technical memorandum california highspeed train project. Jul 28, 2014 practical tunnel construction fills a void in the literature for a practical guide to tunnel construction. Today, the drill andblast method is still widely practiced and used in building tunnels through hard rock where the use of tunnel boring machines is not. Vibration control in urban drill and blast tunneling. The main factors in choosing method are the hardness of the rock and rockmass properties. Highperformance drill and blast methods for tunnel construction require that each. Fullface boring is when a single large bore drills a tunnel with the same dimension as the bore head. Tunnel construction methods and tunnel construction projects.
Pdf estimation model for advance rate in drill and blast. Stability analysis and support design of glandroud coal mine tunnel. This will alter depending on the type of tunnel, the ground conditions, the tunnel length required and the project time pressures. The goal of the course is to give the students further knowledge and understanding of different factors which influence the efficiency, quality, hes and economy of drill and blast tunnelling. The method can be used in all types of rocks and the initial cost is lower than the mechanical method like tbm. Compared with bored tunneling by tunnel boring machine, blasting generally results in higher duration of vibration levels. Models for the analysis of tunnelling construction processes. Drill and blast tunneling practices ctt consulting gmbh. Compared with bored tunneling by tunnel boring machine, blasting generally results in higher. Simulation and study of strength properties of rocks by measuring. Compared with tbm technology, the performance rate of advance for drill and blast excavation is lower in most cases. This tunneling method involves the use of explosives.
Demolition dave drilling and blasting 19,634 views. Introduction this chapter describes the construction process for the second avenue subway. The outcome of this thesis was to translate the standard of each country to english and to compare them with an example cases. For various reasons, drillandblast was usually not the method of first choice in these projects, and because the tunnels were long, the tbm method was chosen. Lecture 4 drifting, drilling, blasting and scaling. Drill and blast tunneling is a method of excavation involving the controlled use of explosives to break rock. For instance, an early 20thcentury blasting manual compared the effects of.
After discussing the processes of drilling, blasting and mucking, and highlighting the effects of blasting. Jul 27, 2011 tunnel construction methods and their comparison. Blast plan a written procedure that details the methods and manner by which a project blaster will comply with pertinent laws, rules, regulations, and contract documents. Furthermore, the simulation runs have estimated the total tunnel development times for the specified development lengths. This is most suitable for tunnels passing through strong ground or for building smaller tunnels. The west island line tunnel between sai ying pun and kennedy town is constructed with the drill and blast method. Practical tunnel construction civil engineering community. Reducing risk in long deep tunnels by using tbm and drilland. Different methods of tunnel construction and their details are discussed. Tunnel construction methods and tunnel construction. Mar 16, 2017 today, in tunnelling projects, especially those in urban areas, there are differences in the cross section.
Lives have been lost in several deep tbm tunnels in the last 20 years, and continue to be lost even in the last few years. Depending on the length of the tunnel, the rock conditions and the proximity to critical structures, tunneling by drill and blast hand mining can be accomplished as safely as the tbm method yet can be more economical. Manual for design and construction of road tunnels. Like trenchless construction and horizontal directional drilling, drill and blast tunneling is a form of subsurface construction. In most of the cases tunnel construction is expensive but it saves time and provides comfort. Tunnel construction methods and their comparison mining. The method of tunnel construction adopted for a project depends on various factors. Excavation sequences, enlargement of excavation profiles for allowing displacement of the.
October 2010, so any quantity takeoff backup provided for a line item unit price had to be taken at. With our dynamic tunnelling package, the drill plan is generated on the drill rig and at the tunnel face. The tunnel passes directly beneath and adjacent to build. Isometric explainer animation for drill and blast tunneling method. The other method is mechanical tunneling which can be separated in full profile excavation and partial face excavation. By taking the reader through a brief introduction and history to a comprehensive discussion of how the geological factors affect tunneling, the author covers the stages and technology that are common today without using complex equations.
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. Complete list of different methods of tunnel construction. The construction method drill and blast method, cut and cover method, tunnel boring or immersed tube tunnel to be adopted will depend on various factors, such as topography and geology, etc. Construction project management for highway tunnels. The drill and blast method is not only economical in comparison to mechanical methods like tunnel boring machine, road header, etc. Construction control technology of drilling and blasting. Most of the openings were developed by the drill and blast method, but the lower 50 m of the main tunnel approx. The drill and blast method is the most widely used technique for rock excavation in tunnelling and underground projects. The opinion is that the drill and blast method offers a higher flexibility and consequently better opportunities to cope with unforeseen conditions. National seminar on construction industry inspiring through practice 154 construction of tunnel by conventional method in bhutan ugyen gyeltshen, general manager, hydropower construction division, cdcl abstract all large hydropower projects in bhutan constructed and those under construction have the components of underground excavation works.
Practical tunnel construction fills a void in the literature for a practical guide to tunnel construction. Drill and blast tunneling practices gerhard girmscheid1 and cliff schexnayder, f. Mechanical excavation and drilling and blasting springerlink. The res ult of roc k blasting is often known as a rock cut. Drill and blast method is mostly used method for the excavation throughout the. This will influence the selection of the route for the tunnel and whether it is economical or feasible to construct where there may be poor conditions or defects in strata. Controlled blasting is a technique of blasting, which is used to reduce the amount of over break and to control ground vibrations. Move your cursor over different colour sections to view more details of the construction methods. The variation in tunnelling speed when excavating in favourable versus unfavourable ground conditions is also less for the drill and blast than the tbm method.
Tunnels in many countries routinely use this method of excavation. Unpredictable ground conditions, environmental requirements and geological factors makes tunneling a challenging job. Only years later did mechanisation take off again, permitting simultaneous working. Its suitability for medium to hard ground conditions has been well recorded 1. Drilling and blasting an overview sciencedirect topics. In the world of underground construction, there are two main methods for the excavation of tunnels in rock. The technique consists of the drilling of boreholes in the rock, the placing of explosives and blasting to properly fragment the work section. In the fullface method, they excavate the entire diameter of the tunnel at the same time. At frontierkemper we are skilled at conventional drillandblast excavation as well as the shotcrete method also known as the sequential excavation method or new austrian tunneling method highway tunnels are often large in crosssection and require conventional drillandblast excavation methods. Drilling rigs are used to drill blast holes on the proposed tunnel surface to a designated depth for blasting.
Mtr shatin to central link construction construction. Click download or read online button to get practical guide to grouting of underground structures book now. They can bore through hard rock, sand, and almost anything in between. Highperformance 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. Practical guide to grouting of underground structures. Blast pattern the plan view of the drill holes as laid out for blasting. This site is like a library, use search box in the widget to.
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