Under high groundwater table condition, the seepage situation becomes more complex and it is more difficult to control the leakage of groundwater to flow into a tunnel. Asce has been approved as an authorized provider by the international association for continuing education and training iacet, 1760 old meadow road, suite 500, mclean, va 22102. Groundwater control techniques for tunnelling and shaft sinking. Preexcavation grouting for groundwater ingress control in tunneling auckland, new zealand. Risk control at the design of a km long railway tunnel. Dewatering for tunnels and shafts groundwater engineering. Optimizing the grouting design for groundwater inrush control in completely weathered granite tunnel. This established professional guide covers the design, construction and environmental management of groundwater control and dewatering works for construction projects. Ground settlement during tunneling in groundwater drawdown.
Modern preexcavation grouting technology peg has been adopted to control the groundwater ingress during tunnelling. The seepage control of the tunnel excavated in high. Processes free fulltext the seepage control of the tunnel. For the mined sections of tunnels and other excavations, the drawdown associated with construction would be shortterm and groundwater levels would recover after tanking of the structures at the end of construction. Dewatering control of groundwater construction of buildings, powerhouses, dams, locks and many other structures requires excavation below the water table into waterbearing soils. However because of the rapid rate of development in tunnel design, currently employed methods may no longer be the most efficient. Pdf groundwater control and curtain grouting for tunnel.
Tunnelinginduced groundwater drawdown has been known to induce associated. Much of the tunnel is dry long reaches have no waterbearing fractures 5. Providing well drilling, pumping tests, intunnel probing and design. Pdf during tunnel construction, groundwater inrush from completely weathered granite strata is a significant challenge to geotechnical. Ground classification systems in tunnel construction. Water leaking into a tunnel or vertical shaft will greatly decrease standup time, causing the excavation to become unstable and risking collapse. Dewatering of access shafts, penetrations, and starter tunnels. In the paper, a multiple times grouting method is proposed. Estimation methods steve macklin principal engineering geologist ghd melbourne. Technology department tunnel investigation and groundwater control5 the results from this programme have provided new information about methods to improve tunnel planning and construction, and is especially important to areas where lowering of the groundwater table may cause severe damage to the surface and manmade structures. Apart from the double track tunnel in this section. The most common way to control groundwater is to install dewatering pipes into the ground and to simply pump the water out.
The vulnerability of the environment, especially related to changes in the groundwater table caused by the tunnel construction, is. The prediction of groundwater inflow into a tunnel is an important issue in tunnel engineering. He is widely published on dewatering and groundwater control and is the author of the uk industry guidance on dewatering ciria report c515 groundwater control design and practice as well as a dewatering text book groundwater lowering in construction. However, modern geotechnical techniques can allow groundwater to. Pdf the seepage control of the tunnel excavated in high. Slurry tbms as well as earth pressure balance epb tbms are used. Groundwater ingress control for deep subsea tunnels under urban. 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. One of the major case studies concerning excessive ground surface settlements during tunneling is the romeriksporten tunnel construction in norway, where more than 1 m of ground subsidence occurred due to groundwater drawdown during the construction of a highspeed railway tunnel. Section 02310 tunnel groundwater control city of san diego, cwp guidelines. Groundwater control is very important in tunnel construction. Such excavations require lowering the water table below the slopes and bottom of the excavation to prevent raveling or sloughing.
Groundwater control and curtain grouting for tunnel construction in completely weathered granite article pdf available in bulletin of engineering geology and the environment january 2017 with. Introduction this course is to be taken in conjunction with the opensource dod handbook ufc 322005, dewatering and groundwater control. This publication should be downloaded and easily available to. Controlling of disturbances due to groundwater inflow into. Seepage force acting on the support structure and the tunnel surface cannot be negligible. Second is face instability due to groundwater seepage.
Groundwater control in urban areas designing buildings wiki share your construction industry knowledge. Working below groundwater level can be difficult, as the excavation is at risk of instability and inundation. Temporary groundwater control for construction of railway tunnels in copenhagen igs 339 ngm 2016 proceedings quality measurements in residential basements. Dewatering and groundwater control tm %3185afm 885, chapter 6navfac p418, 15 november 1983 is changed as follows. The ground conditions, the tunnel length required and the timings of the project. Groundwater inflow into a tunnel can lead to problems during construction. Full text of groundwater control in tunneling see other formats.
The chapter is based on the impact assessment presented in technical appendix o groundwater. Wj uk are the construction dewatering and groundwater management partner of choice. Summary outline construction dewatering and groundwater control design and application ceuspdhs. Groundwater control services from groundwater engineering. Tunnel investigation and groundwater control statens vegvesen.
Groundwater control describes the engineering techniques used to allow engineering excavations and mines to be constructed below groundwater level in workably dry, stable and safe conditions. Construction for tunneling ground improvement grouting methods for groundwater control obstructions and mixed face tunneling case histories tunnel planning and minimization of risk investigation and pre planning method and equipment selection performance envelopes for various tunnel specification preparation for tunneling. Wj offer a complete construction dewatering and groundwater control service, ranging from design, installation, testing, monitoring and management of both temporary and permanent dewatering solutions to a wide range of customers. Tunnels are dug in types of materials varying from soft clay to hard rock. Original paper groundwater control and curtain grouting for tunnel construction in completely weathered granite jinquan liu1,2 weizhong chen1,3 jingqiang yuan1 changjun li1,2. The present study is a part of the groundwater control project which. Groundwater causes extreme geotechnical problems in excavations such as sand running for most of construction projects such as tunneling.
Our complete dewatering solutions include design or dewatering systems, well drilling and installation, pumping tests, equipment sales and rental, monitoring systems, onsite operation and maintenance. Groundwater inflow to tunnels breakthroughs in tunneling boulder, colorado. First is flooding or inundation of the tunnel by groundwater inflow. Interaction between groundwater and tbm tunnel boring machine. This would include the development of a dewatering strategy and the implementation of groundwater control measures. The planning will help to see depending on the type of tunnel. Diverse problems there is an important distinction between two different types of problem caused by groundwater. Recommended practice a manual containing case specific information on control of groundwater both during construction and in completed tunnels. Therefore, the hats 2a project has been designed with emphasis on adapted and adequate groundwater control as an integral part of the tunnelling process. Tunnelling on ground groundwater and control measures 1. View enhanced pdf access article on wiley online library html view.
The work of this section includes designing, furnishing, installing, maintaining, operating. The stress distribution around the tunnel will be changed greatly when tunneling under high groundwater table. Water control in underground mines grouting or drainage. All relevant references are provided in technical appendix o. Volume 1 discusses methods for controlling groundwater during construction of. Optimizing the grouting design for groundwater inrush.
Dewatering and groundwater control for soft ground tunneling. The bored tunnels are proposed to be tanked as the tbms progress, so inflows would be negligible during construction and operation. Groundwater control techniques for tunnelling and shaft. Another typical way of assuring groundwater control is by artificial. Controls on damage zone asymmetry of a normal fault zone. Hats 2a has implemented groundwater control by preexcavation grouting peg as an integral part of the underground construction process. Construction dewatering and groundwater control is an indispensable tool for all engineering and construction professionals searching for the most uptodate coverage of groundwater control for various purposes, the modern ways to identify and analyze sitespecific situations, and the modern tools available to control them. Construction dewatering and groundwater control design and. Part 4 obstacles and mitigation course satisfies five 5 hours of professional development. This paper presents a coupled seepageerosion water inrush model to investigate the characteristics of seepageerosion properties. The size and length of the tunnel will determine the equipment is necessary for mucking out debris. Subsequently, updating and calibration of a numerical 3d groundwater model, designed to assess the different strategies, and provide the optimal design of the system, was undertaken.
Groundwater control and curtain grouting for tunnel. Excavation works for underground infrastructure such as deep basements or tunnels often encounter groundwater. Groundwater can cause many hazardous problems when a tunnel is excavating. To facilitate tunnel works construction, techniques that incorporate in situ ground treatment, groundwater control, installation of temporary and permanent supports, and so on, are adopted to stiffen and strengthen the ground and to reduce its permeability.
Dewatering and groundwater control for soft ground. An experimental and field investigation weihua zheng 1, dengwu wang 2, guijin li 1,3, lin qin 4, kai luo 2 and jinquan liu 3,5, 1 jiangxi vocational and technical college of. Preexcavation grouting for groundwater ingress control in. Contract requirement on residual groundwater inflow. For example, route design and tunnel construction are largely dependent on geological considerations. In the molasse formation the confined groundwater is situated in a depth of 1,5 m to 20 m below surface mainly. Groundwater engineering have decades of experience in groundwater control projects around the world, and provide a complete design and installation service. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management. During tunnel construction, groundwater inrush from completely weathered granite strata is a significant challenge to geotechnical engineers. Up to the present, prevention of water inrushing hazards is almost exclusively based on the experience of engineers. Dewatering differences preene groundwater consulting. Groundwater control in urban areas designing buildings wiki.
1049 1086 234 151 1484 700 1477 1304 1194 733 1103 566 1388 187 38 600 258 1245 523 1104 801 1499 827 9 1016 1141 976 156 255 1497