... ABSTRACT: In conventional elasto-plastic numerical analyses of underground structures, such as tunnels, caverns, shafts and trenches at a great depth, the structures never collapse, even though large plastic zones appear around the openings. In reality, however, tunnel crowns often collapse...

... bearing element is completely unaddressed in the Eurocode. On the other hand, the Guidelines for the geotechnical design of underground structures, published by the Austrian Society for Geomechanics represent a sound and practically tested design methodology. However, the issue of proofing that the chosen...

... of explosive will be blasted for a burden of 3.5 m having hole diameter ranging from 57 mm to 165 mm. Both static and dynamic loads along with mass extraction of ore adversely affect the stability of underground structures. A 3D finite element analysis is carried out to examine the stability of transverse...

... ABSTRACT: The underground facilities are used for a wide range of civil and military applications (railways, highways and material storage). These underground structures are constructed in different possible ground conditions ranging from soft ground to massive jointed rock. Generally...

... feedback defined by accurate means. Results show that rock joints can significantly affect the transmission and the attenuation of shock waves, and can therefore influence the stability of the adjacent underground structures. The spacing of joint set can also remarkably affect the propagation process...

... of the formation surrounding an underground structure. The algorithm is first tested using a synthetic case of a tunnel excavation. In this case, different scenarios are considered through a parametric study. Then the algorithm is tested using real data from the excavation of an underground structure built...

... Understanding time-dependency of rock is indispensable for geotechnical applications to estimate long-term deformation and stability of underground structures. In previous studies the authors investigated the time-dependent behaviors of rock such as loading-rate dependency of strength (Hashiba et al. 2006...

... Artificial Intelligence criteria discontinuity classification system outdated natural language underground structure tunnel design requirement rock mass Palmström machine learning Engineering Rock mechanics hazard excavation tunnel text classification empirical method...

... Abstract The geotechnical design of underground structures deals with the interaction between the ground and the structure. The key element of this behavior is the potential failure mode of the ground, which mainly depends on the ground conditions including ground parameter, water and primary...

... Current (DC) electrical survey and a seismic surface wave survey to investigate the underground structures of the beachrock in Yagaji Island, Okinawa, Japan. In order to estimate the effectiveness of the geophysical surveys, we conducted laboratory tests to measure the resistivity, the shear wave velocity...

... for the machine cavern is 27.6*46.6*92.5mand 18.1*30.9*112.6m for the transformer cavern. The machine cavern also hosts three upstream spherical valves, where else the three butterfly valves are situated in the transformer cavern. All access tunnels to the underground structure are connected to the existing...

... in an appropriate sense. For dynamic analysis study revealed that a ubiquitous joint model is more appropriate for dynamic analysis of underground structures in rock. 1 INTRODUCTION Rock masses often contain natural discontinuities and joints which makes the task of their modelling quite challenging. This has...

... The paper presents a brief analysis into the main issues related with the safety control of old railway tunnels, with special emphasis to the maintenance of these underground structures. The paper also refers to the most important aspects associated with the application of the knowledge-based...

... LEP underground structures but will also require substantial new surface and underground facilities. The two new detectors, the ATLAS at Point 1 and the Compact Muon Solenoid (CMS) at Point 5, will be larger and more complex than any built to date. The new detectors, weighing up to 15.000 tons...

... appropriate underground structures. This particularly applies to large cities situated along the Adriatic coast (Rijeka, Split, Dubrovnik, Šibenik). From the engineering-geological and geotechnical standpoint, the rational and cost-effective design and construction of underground structures must be based...

.... The experimental results are used to set up a non standard elastoplastic model dealing with instantaneous mechanical behaviour of rocksalt. Numerical implementation of the proposed model allows to demonstrate damage evolution for 2D simplified underground structures. RÉSUMÉ: L'initiation de l'endommagement est...

... is based on mathematical modeling the interaction of the underground structure and the surrounding rock mass as ele- ments of a united deformable system undergoing the actions of the rock's own weight, internal water head and external ground water pres- SUre. For the analysis of the lining stressed state...

... ABSTRACT: An analysis of the calculation methodologies followed in the structural design of underground structures in hydroelectric projects is presented, as well as the numerical models usually adopted. Some applications of computational mechanics to the Alto Lindoso hydroelectric power...

... ABSTRACT: The Castelo do Bode tunnel is part of the water system to the Lisbon area and is located immediately after the Castelo do Bode reservoir. Particular importance was given to the verification of the safety and serviceability of this important underground structure. Loading tests were...

... Abstract: The stability of underground structures is the most important and complicated concept in rock engineering. There is no explicit way to evaluate the stability of a structure in rock. For this reason implicit methods accounting for the stability through exploration and analysis of rock...