... Abstract The catastrophic Vajont landslide was preceded by a long creeping phase concentrated in a clay basal layer. Recent experimental investigations performed at high velocities under both dry and wet conditions contributed to the understanding of the friction degradation experienced...

... Abstract The scenario of deepwater exploration under large thick salt formation is challenger and motivates the development of new technologies to deal with costs, safety and environmental issues. This paper deals with the mechanical characteristic of strong creep behavior of salt rocks...

... Abstract Coal permeability is the key factor which determines the effectiveness of coal-bed methane (CBM) exploitation. In the CBM production cycle, the long-term high temperature and stress to make the seepage paths in coal with time. In this paper, the seepage evolution in coal creep under...

... of stress and relative humidity thresholds from which the creep of this chalk starts, (b) the flooding at the last levels of stress and hygrometry leads to an accelerated creep causing the ruin of samples without transient phase. 1 Introduction Chalk rocks have been used for centuries as building...

... to study the evolution of fracture friction under holding and sliding processes. Limestone fracture shows time-dependent behaviors in SHS tests, friction drops (creep) gradually during hold periods, and recovers (healing) after re-slide. Frictional healing and creep increment are proportional with hold...

...-continua. This paper reports on an integrated modelling approach allowing for the variable stiffness behaviour of reinforced concrete at different stages of flexural cracking and the effects of creep in interaction with discontinuous rock surround. The concrete behaviour model was implemented...

... ABSTRACT The present paper deals with the time – dependent rock deformation during tunnelling, and more particularly, its association with the related phenomenon of creep in its viscoelastic form, as well as the numerical evaluation of it. Initially, a brief introduction of these two phenomena...

... Upstream Oil & Gas damage growth plane excavation structural geology deep geological environment experiment creep reservoir geomechanics brittle failure Inada granite differential stress granite time-dependent damage growth Reservoir Characterization wave velocity tertiary...

... of salt (creep, damage) as well as transfer processes of this material are presented. The influence of these aspects on the long term evolution of abandoned salt mines is then analysed. ZUSAMMENFASSUNG Der Artikel bezieht sich auf zwei bedeutende Aspekte beim Salzabbau: Das langsfristige Risiko zur...

... on strength, stiffness, chemical shrinkage as well as microcracking and creep are accounted for. For the description of the mechanical behavior of the ground, a multi-surface plasticity model is employed. The performed analyses of the excavation process provide insight into the influence of each phenomenon...

... Abstract A three-dimensional elastic constitutive model for rock salt is proposed. This stress strain law takes into account the three phases of creep (transient, steady state and accelerated creep), dilatancy, as well as the failure and post failure behaviour. The model was implemented...

... efficiency of the system. Reservoir Characterization viscoplastic behaviour identification relaxation test stress Redistribution Upstream Oil & Gas monotonic quasistatic test dilatancy damaging process proceedings creep excavation damage zone rupt underground waste depository cavity...

... of the slopes in the database have exhibited tertiary (accelerating) creep leading to collapse. Analysis of the displacement records is carried out, with discussion on limits for total displacement and displacement rate. Assessment is made of the mathematical form of the tertiary creep curve and the likely...

... ABSTRACT: An experimental program aimed at characterizing the variation of the elastic parameters in uniaxial short-term creep tests of rock salt has been performed. The experimental technique used is based on the measurement of the travel time of the longitudinal and shearing, elastic waves...

... ABSTRACT: In this study, a series of creep and fatigue tests are carried out on soft and hard rocks in Japan. These tests are performed by means of both the conventional loading procedure and a newly developed procedure, which we have named the "creep/fatigue loading and after load increase...

...: A threedimensional elastic/viscoplastic constitutive model for rock salt is proposed. This stress strain law takes into account the three phases of creep (transient, steady state and accelerated creep), dilatancy, as well as the failure and post failure behaviour. The model was implemented into a finite element...

... may be altered by fluid pore pressure. The coupling is especially significant in the halitic material which contains the Waste Isolation Pilot Plant (WIPP) due to salt creep into the open excavations. This work focuses on developing a coupled fluid-flow and mechanical model which includes...

... theory plane contact problems with the linear heridatory rock creep to be taken into account. RESUME: On examine la simulation mathematique de l'interaction des blindages des tunnels avec la massif et les methodes de calcul analytique des constructions souterrain. On prend en considerationles forces...

... ABSTRACT: In order to determine the "global" short term constitutive behavior of a viscous and homogeneous rockmass, we propose a new approach, based on a cross identification of paramaters on two complementary laboratory tests, relaxation on cylindrical samples and radial creep on thick...

... ABSTRACT: Water based drilling muds influence on the mechanical properties of shales. Through experiments it is shown how the creep properties of shales from a North sea well, are altered due to the exposure to drilling fluids. The experiments were carried out in a specially designed, self...