Calculation of ground surface settlements design of face pretreatment in difficult ground conditions selection among alternative methods sensitivity analyses. Existing tunnel was classified as aa in the manual mentioned in 9. The initial design for underground excavation considered the use. Part iii hydraulic design was first published in 1968.
Karnchang lao company limited, vientiane, lao pdr 3 nam ngum 2 power company limited, vientiane, lao pdr abstract the design of the pressure tunnel is. Guidelines or the structural detailing of the tunnel lining and national recommendations on tunnel design are also given. The headrace tunnel carries water from intake to the power house by connecting the desilting chamber to the surge shaft, from where water is further carried to. Part 3 design and detailing ezekiel enterprises, llc. I consent to receive emails with offers, news, surveys and contests, regarding head groups product range and services. All other model parameters including in situ stresses. Practices in planning, design and construction of head race. The hydropower station with a super long headrace tunnel is a. In hydroelectric project hepss, monitoring and upkeep of hrt head. This water has served its purpose, and leaves the power generation unit or water wheel area. Approved continuing education for licensed professional engineers design and construction of road tunnels. Mrt nel c706, design of bored tunnels along race course road. The project consists of two interconnected reservoirs on rangpoand rongli rivers with an installed capacity of 99mw. There are different definitions for headrace tunnel hrt used at different scenarios.
To give the future hydropower system the flexibility and behavior required to serve the demand from market, grid, bilateral power cables, new industry, new materials and advances in turbine and generator design, tunnel systems and penstocks must be designed different from the state of the art technology. During the first filling of the shaft and the tunnel, increasing leakage through a micaschist layer was observed. There are different definitions for headrace tunnels hrt used in different scenarios. Criticalities encountered in construction of hrt head. Part 2 methodology and excavation support ezekiel enterprises, llc course description. Flyer 5 cu inch class hydroplane race craft 14 scale frame plans. With this, 92% of the total work of the project is completed. The tunnel passes 380 m 1,247 ft below the jhelum river and through its bend.
In stage i of modelling, the modulus of elasticity of the material to be excavated from the tunnel is reduced by the ratio established above. Svrt design ground motion pga for the tunnel segment. Headrace tunnel takes water from connecting channels and convey it to the fore bay or directly to the penstock provided with surge shaft depending upon the project and site requirements some times also known as power tunnels. Featuring the latest technologies, superb design and delivering the best performance in all conditions, this is where your ultimate skiing experience begins. Design discharge is the amount of water to be carried by the headrace tunnel of specific diameter with a pre defined longitudinal slope, greater the slope more will be the velocity of water through headrace tunnel and hence more will be head losses. Head race tunnel is also dependent on the sediment concentration. The project has two intakes each with a storage reservoir and a head race tunnel, both joining together to a common large headrace tunnel, an. While the tunnel boat derives much of its high performance from air lift, it depends at the same time on its planing interaction with the water to maintain a stable and controlled flight. Pdf ground response studies for the design of head race. Design of concrete lining for head race tunnel using. A norwegian firm completed the feasibility study and detailed design of. Design of a throttled surge tank for refurbishment by. Prediction of tunnel deformation in squeezing grounds. Twin 10 km long parallel headrace tunnels were excavated as part of the head race tunnel system for the neelum jhelum hydroelectric project.
Design of reinforced concrete linings of nn2 headrace tunnel. Kong ap design, mwh australia pty ltd, level 3, 35 boundary street, south brisbane, qld 4101, australia w. Filling and pressurizing of the headrace tunnel for the. Building a closedcircuit tunnel, however, would have exceeded my space and monetary constraints, so i opted for an opencircuit design. The glendoe tunnel collapse in scotland springerlink. The steellined part of the pressure shaft starts at an altitude of 1,040 m a. Todays design, construction and operation of unlined pressure tunnels and shafts are.
General layout and profile of a high head diversion canal development the main parts of a high head diversion canal type plant are. Pdf ground response studies for the design of head. Abstract an investigation of the engineering geological properties and geotechnical parameters of rock masses along a horseshoeshaped head race tunnel hrt in the teesta stageiii hydroelectric project, sikkim, india, was carried out to analyze the rock mass. Ground response studies for the design of head race tunnel hrt. Selection and design of the support system are only two of many interrelated factors in the overall design of a serviceable and economical tunnel.
Design and construction of cast insitu steel fibre reinforced concrete. The basics documents for tunnel design should include or cover. The course is designed as a distance learning course that enables the practicing professional engineer to understand the planning process of a road tunnel project. Empirical and numerical analyses for support system design in head race tunnel.
A tunnel hull design that is easy to build, no prop shaft or universal joints to buy a great project if you have little time to spare. Drawings of plan and profile of main civil structures headrace tunnel, surge tank. Criticalities encountered in construction of hrt head race. Challenges of design and construction of a highway tunnel. The tunnel has been designed using the natm concept. This thesis is to focus on the two head race tunnels within the melado hpp, which together account 16. Whether race, piste or freeride, beginner or professional, the head ski collection has something for you. Practices in planning, design and construction of head. Headrace tunnel of upper tamakoshi hydroelectric project.
Tunnel design shall follow the above dimensions and clearance in height for the traffic is determined as 5. Design, dimensions, and operating characteristics of the. The overhead valve pushrod engines competed for space with the intake ports. The glendoe headrace tunnel is part of the works associated with the. The water conductor system conveys water to penstock. Layout of hydropower scheme waterway highlighted blue. Headrace tunnels definition, uses and types of headrace. The course is designed as a distance learning course that enables. Water conductor system water conductor system consists of head race tunnel of suitable size. Headrace tunnel anchor block surge tank penstock inlet valve tunnel inlet trashrack tunnel inlet anchor block exp. Pervious pressure tunnel overburden and lateral extens.
The quiz may be taken as many times as necessary to successful pass and complete the course. The geotechnical report on site investigations, including the interpretation of the results of site and laboratory tests. The principle the water conduits of a traditional high head power plant. Jul 18, 20 the head race tunnel faced severe squeezing due to above mentioned geological conditions. Water conductor system may consist of tunnel, channel, cut and cover as per the topography involved. The chuzachen hydroelectric power project is located in sikkim state in northeastern part of india. Urban tunnel design using numerical analysis tunnel excavation and support is traditionally an empirical art numerical analyses are useful in the following cases. Part 1 planning course satisfies five 5 hours of professional development. Water filling in head race tunnel of neelum jhelum hydropower project starts on march 1, 2018. In order to execute the river crossing of rep, a diversion tunnel. Engineering geological and geotechnical investigations along.
Conventional design places the pushrods along side a rectangular shaped intake port. Segmental tunnel linings steady development in shielded tunnel excavation rates. On paper this combination of the head design with the new 4 bolt main 302, looked unbeatable. The dam diverts up to 280 m 3 s 9,888 cu fts of the neelum southeast into a 28. Abstracta channel tunnel, which carries the water to the penstockpressure shaft is called head race tunnel hrt. Practices in planning, design and construction of head race tunnel of a hydroelectric project. The course is designed as a distance learning course that enables the practicing professional engineer to identify and handle many of the hurdles encountered during tunnel construction. A closedcircuit design minimizes the energy requirement and hence cost of operating a tunnel and, at least in principle, makes it easier to achieve uniform flow. Since the tunnel lining is subjected to combination of axial force and bending moment, the design is conveniently carried out using the capacity interaction curve, also called the figure 4. Part 2 methodology and excavation support course satisfies five 5 hours of professional development. Design of reinforced concrete linings of nn2 headrace tunnel aphichat sramoon1, parin mruetusatorn1, beni lekhak2, rawee sittipod3 1 geotechnical and foundation engineering co. Geotechnical risk is dealt with contractually in designbidbuild contracts by.
The project will geerate n 161 mw of firm power with an annual energy generation benefit of 3592 mu in a 90% dependable year. Pdf groundwater ingress in head race tunnel of tapovan. Lacsd clearwater tunnel will have posttensioned segments for internal pressure in soft ground, which will be the first application of this type in usa. Water filling in head race tunnel of neelum jhelum hydropower. The tunnel was supported with steel ribs at 1 m spacing c. For all recreation, performance family hulls, utilityfishing hulls, race hulls or even rc models. Definition, uses and types of headrace tunnels aboutcivil. The headrace tunnel runs 26 km 16 mi under the fofa mountain and at its end, it converts into a penstock with a 500 m 1,600 ft drop. The geological report presenting the results of the geological and geophysical survey. Design and evaluation of a lowspeed windtunnel with.
The tunnel is expected to pass through muree formations of the himalayas which are influenced by regional and local faults and shear zones. The gilgel gibe ii consists of a power station on the omo river that is fed with water from a headrace tunnel and sluice gate on the gilgel gibe river. Race tunnels is a critical task for proper operation and safety of the plant especially in. Design and construction of tunnel through such a complex and varying geology with a rock cover of more than m is a difficult and challenging taks. The tunnel layout presented below is the result of adapted design to the ground findings from investigations, together with the project specific minimum requirements. Read this article to learn about the following six components of hydro power plant, i. For an open channel, the headrace crosssection could be.
This water has served its purpose, and leaves the power generation unit or water wheel area in hydroelectric dams, the tail race is at a much lower level than the height of the. Design and construction of under river crossing of head race. Headrace tunnel stability in the neelumjhelum hydroelectric. The water in this channel has already been used to rotate turbine blades or the water wheel itself. The headrace tunnel is a major part of the hydropower project as it connects the reservoir to the power station. Tunnels shorter than 500 m are designed with an emergency lane along its total length, and tunnels longer than 500 m are designed with laybys at a maximum distance of m instead. Pdf design of concrete linings of pressure tunnels and. Impact of construction method and ground composition on. This is one of the longest head race tunnels in india with maximum overburden height of mountain above tunnel of 1470 m, claims hcc. Geological section of kaligandaki a headrace tunnel. Engineering geological and geotechnical investigations. When the water reaches the power station, it powers four pelton turbines that operate four 107 mw. Water filling in head race tunnel of neelum jhelum. Design and construction of under river crossing of head race tunnel rampur hydro electric project 412 mw.
Headrace tunnel takes water from connecting channels and convey it to the fore bay or directly to the penstock provided with surge shaft depending upon the project and site requirements some times also. Segmental concrete tunnel liners tunneling short course. This revision has bccu taker up with a view to keeping abreast with the technological developments that have taken place in the field of tunnel design and con. Ksb offers a broad range of pump types to meet the most varied requirements. Three main types of high head power developments may be discerned. The design of unlined hydropower tunnels and shafts. Mrt nel c706, design of bored tunnels along race course. Problem statement in hydroelectric project hepss, monitoring. Pervious pressure tunnel overburden and lateral extension. Thus, the total width of the tunnel is about 12 m and the height is about 7 m. Part 4 obstacles and mitigation course satisfies five 5 hours of professional development. Intake gate intake trashrack headrace tunnel anchor block surge tank penstock inlet valve tunnel inlet trashrack. The project consists of two interconnected reservoirs on rangpoand rongli rivers with an. Anticipated tunnel execution technology is natm new austrian tunnel method.
Preliminary design for road tunnels on transeuropean vc. Aside from reducing the user load on the larger mtl wind tunnel by. Numerical verification of empirically designed support for a. The most advanced publication on tunnel hull design, how a tunnel hull works, and detailed explanation of design and setup for tunnel boats, power cat, or modified vee hulls. It is necessary to know the general topography, geology of the area, state of stress and other mechanical properties of the strata. This interdependence of hydrodynamic and aerodynamic design is the key to the approach to tunnel design. After five years since its initiation, the headrace tunnel of the upper tamakoshi hydroelectric project uthep has been completed. Hydraulic design of surge shaft definition and design of. Oskar sigl and georg atzl, c706 design of bored tunnels along race course rd. The empirically designed support was installed in the model prepared in the.
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