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Papers from WTC and ITA conferences have been made available as PDF documents.
ProceedingsThere are 1984 documents.
List of endorsed conferences
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WTC
World Tunnelling Congress
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Dynamic response of tunnel portals in mountainous areas with High seismic activities
Abstract: Many portal structures of tunnels in mountainous area have been severely damaged during strong earthquakes in recent years, especially in the Wenchuan earthquake. This paper analyzes the dynamic responses of tunnel portal structures using three dimensional (3D) Finite Difference Method (FDM) for a real highway tunnel in Wenchuan area. The deformation characteristics and stress behaviour of the...
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Water ingress and groundwater control in double shield TBMs at the Follo Line Pro ject - Norway
Abstract: Tunnel projects in Norway run the risk of high water ingress during construction phase, resulting in pore pressure reduction in both rock and soil above the tunnel. This is due to risk of settlement in sensitive clay sediments and draining wetlands. Thus it is crucial to identify areas sensitive to pore pressure reduction above the tunnel alignment during the design phase. As a result of the...
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Vulnerability of shotcrete on tunnel walls during construction blasting
Abstract: Detonation of explosives during excavations of tunnels and underground spaces give rise to stress waves that transport energy through the rock and these may, depending on the magnitude of the waves, cause severe damage to permanent installations and support systems within the rock, such as shotcrete. Today there are no reliable and established guidelines for when blasting can be allowed close...
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Vehicular Tunnel Networks for Sustainable Cities
Abstract: In the past few decades, urbanization is in rapid progress in many cities over the world. The concentration process of population and demand for goods to the cities has placed enormous pressure on the transportation networks in the cities. To relieve the pressure, expanding the capacity of the transportation networks is one of the key measures. Highways and bridges are built to handle this...
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Variations of Atterberg Limits of Clays and Their Chemical Mechanism Due to Soil Conditioning
Abstract: To determine of ideal type and content of soil conditioners for earth pressure balance (EPB) shield tunneling in clayey ground, this study investigates effects of soil conditioners on Atterberg limits of clays and conditioning mechanism based on their chemical effects. The applicability of soil conditioners (including foam and dispersant) was determined based on the changes of Atterberg limits...
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Unrelieved Spesific Energy Estimation from PLCM and FLCM Linear Rock Cutting Tests and Comparison with Rock Properties
Abstract: Estimation of laboratory specific energy values from mechanical rock properties to predict the efficiency of mechanical miners (tunnel boring machines, roadheaders, continuous miners, shearers, etc.) is the basic aim of this study using laboratory linear rock cutting devices. Specific energy is defined as the amount of energy required to break a unit volume or weight of rock expressed in kWh/m3...
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Uneven settlement induced by a curved shielding tube
Abstract: Settlement induced by a curved tube is different from that in straight tube case. The field test on a metro project in Malaysia has been conducted,which contains several curve portions. Five observation sections at varing alignment radius are arranged.The in-site surface settlements on those sections are well fitted by two separate Peck formulas with the tube centerline as the axis.And the...
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Underground Structure arrangement and layout of Kaligandaki Koban Hydroelectric Project at different stages.
Abstract: Kali Gandaki Koban Hydroelectric Project is located in the Koban and Lete Village Development Committees (VDCs) of Mustang District in Nepal, between 83 35’ 00”E to 83 41’ 21” E and 28 36’ 15” N to 28 38’ 40” N. The headworks is planned at Kalopani 0f Dhampu village, whereas powerstation site is about 6 km further downstream at the village of Ghasa.The world’s 10th and 7th highest mountains,...
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Two-way Conveying in Tunneling Projects
Abstract: In tunneling projects underground space is limited, accidents are to be avoided and material logistics for mucking and aggregates transport has to be efficient, clean and reliable.Using specially designed conveyors for drill and blast operation as well as for TBM tunneling instead of wheel based transportation systems improves air quality, heavily reduces ventilation costs, decreases accidents...
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Tunnel segmental ring system and geometry - optimized design recommendations
Abstract: Segmental tunnel linings installed in the rear of the TBM shield are generally in the shape of circular rings. Size of the ring is defined by the internal diameter, thickness, and length of the ring. These three major geometrical parameters are discussed in details. First, the dimensions of the tunnel inner section are discussed considering the internal space required during the service, which...
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Tunnel Portal Construction using sequential excavation method: A Case Study
Abstract: Portal excavation in soft rock is one of the most challenging tasks in the construction of underground facilities. Significant convergence, collapses and surface settlement are usually associated with portal construction. Alluvium is loose unconsolidated material and most often tunnels constructed through tend to destabilize. In this study, portal excavation design has been analyzed using the...
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Tunnel excavation through a building piled foundation
Abstract: The main problem addressed in this paper is a methodology to assess the effects of tunnel excavation passing directly underneath piled buildings, truncating several of the foundation piles, evaluating the effects on the structures as well as the corresponding risk level. In any case, it must be taken on account that any disruption in the normal life of the installations will not be permitted...
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Tunnel and Underground Risk in Hydro power – a Lender’s Technical Advisor’s Perspective
Abstract: This paper explores the role of the Lender’s Technical Advisor (LTA) in identifying and mitigating risks in hydropower projects on behalf of the project lenders, in particular for the tunnel and underground aspects. It describes the typical services required to manage the four key phases of: due diligence, prefinancial close, construction financing and operational financing for hydropower...
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Three different techniques to build a shaft: the DSSI-MTS01 project, case study in Doha, Qatar
Abstract: As part of the Doha South Sewage Infrastructure Project, Contract MTS01- (DSSIMTS01), in Doha (Qatar), 11 shafts need to be excavated, whose depths range from 21m to 43m and diameters vary between 8m and 15m. The hydrogeological configuration of the Qatar peninsula is composed of, from top to bottom, Simsima limestone, Midra shale and Rus calcareous / gypsum formation, with two independent...
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ADECO and NATM comparison: the case of Višňové Tunnel
Abstract: The paper presents the application of the “A.DE.CO-RS Approach” for the construction of “Višňové Tunnel” in D1 Motorway. It is a double lane tunnel of the D1 Motorway “Lietavská Lúčka – Višňové – Dubná Skala”, about 7450 m length. It’s located in the Žilina district of Slovakia. In a Yellow FIDIC contract, the JV Salini Impregilo–DUHA proposed to the Client a variation of the excavation...
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The Use of Numerical Analysis in Rehabili tation of Baltimore Howard Street Tunnel
Abstract: This paper discusses the use of numerical modeling for optimization of tunnel rehabilitation scheme to improve the clearance of the Howard Street Tunnel in Baltimore, MD. With a total length of approximately 8,700 feet, the Howard Street Tunnel consists of three sections: concrete box section, original cut-and-cover section, and original mined section. The Howard Street Tunnel currently has a...
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