... the economical down side related to the ore write offs in pillars. reservoir geomechanics Raasakka ore domain Modeling & Simulation Finland Johansson excavation Tampere stress measurement Reservoir Characterization Upstream Oil & Gas stability extension pillar international symposium...

... Abstract In situ rock stresses are directly associated with the stability of underground openings and thus the state of in situ rock stress is a crucial factor for the design of underground excavations. The consequences of the rock stresses are rock deformation and rock failure. Concerns have...

... Abstract At Outokumpu Chrome Oy Kemi chromite Mine, Finland rock mechanical problems caused by rock stress occur in unfavorable geotechnical conditions. Maximum rock movements are about 10 to 20 cm. This has led the need to repair the rock support and re-excavation. A research program...

... Abstract The construction of the Romaine-3 surface powerhouse requires an important excavation of approximately 98 m (left to right bank direction) by 64 m (upstream-downstream direction) and 80 m deep in the rock mass. The water intake tunnel as a length of approximately 1.8 km including...

... zones intersect the planned station. These pose interesting challenges in the project that were dealt with rock mechanical analysis including the study of the effect of the stress state and excavation sequencing. The analysis were used to guide, and advise the engineering design and layout planning...

... Abstract Excavation of long deep tunnels through adverse ground conditions by shielded TBMs requires thorough rock stability analyses to evaluate the possibility of entrapment of the machine. This refers to the assessment of ground pressure and displacement in tunnel walls. For this purpose...

... Abstract A method to back calculate stress state change was developed in Dynamic Control of Underground Mining Operations (DynaMine) research project. The purpose of this method is to provide real-time estimates of the stress state change caused by excavation. In this paper the method...

... Abstract Rantatunneli is a project of moving highway 12 into a tunnel in the city of Tampere. The excavation work was finished in the summer 2015. The tunnel will be operational in 2017. The twin tunnel will be the longest highway tunnel in Finland with the length of 2.3 kilometres...

... in the vicinity of existing underground caverns, which have to be adequately considered in order to estimate the natural state of stress. 1 INTRODUCTION Release of the state of stress is often the most relevant action during the excavation of an underground work, and it can affect the location and orientation...

... for reasonable geostress field for excavating simulation and analysis on stability of the underground workshop of Wendeng Pumped storage power station. 1 INTRODUCTION The initial stress field of rock (or geostress field) is the necessary condition for rock engineering numerical simulation and the stability...

.... (Peng, 2006 & Hartman 1988). strength chain pillar excavation Reservoir Characterization Longwall Mining extraction stress concentration longwall panel reservoir geomechanics coal metals & mining formula tailgate stress distribution barrier pillar bulk modulus vertical...

... to the notice that an optimistic assessment of in-situ stresses may result into costly design surprises during the excavation stage. Consideration of incoherency in the computed in-situ stress magnitudes and orientation resulted into lowering of the caverns level farther 5 m from the surface than the design...

... prediction slenderness bologna university structural geology rockburst strength value loading University Rock mechanics specimen excavation Carrara marble Italy exploitation Rock Stress and Earthquakes Xie (ed.) © 2010 Taylor & Francis Group, London, ISBN 978-0-415-60165-8 Studies...

... ABSTRACT: The Skaland mine is a graphite mine in Senja island, North of Norway. The mine is located in a granite rock (possibly be Migmatite). The owner of the mine – Leonard Nilsen and Sons (LNS) – plans for a new excavation profile, and the stability of the excavation needs to be checked...

... rock stress may bring forth additional difficulties in rock support design. It is crucial to take into account the in-situ rock stress in designing of the shape and orientation of underground works and selecting of excavation methods and rock support. With a number of examples of real projects...

... ABSTRACT: The changes of in-situ stress magnitude and directions caused by the excavation disturbance effect of pilot tunnel are usually neglected. Firstly, the surrrouding stress field of pilot tunnel was inversed finely by multiple linear regression inversion anlaysis in the local mesh model...

... be obtained by interpretation of these phenomena disclosed during the excavation of the auxiliary tunnels and the underground testing sites. Based on these data, the multi-methods integration analysis is carried out to estimating the regime, orientation and magnitude of the in-situ stress at this site...

.... Hast) first carried out the work of earth stress measurements in the Scandinavian Peninsula. Reservoir Characterization lithosphere back-analysis method application structural geology displacement earthquake prediction excavation stress measurement Upstream Oil & Gas calculation...

... ABSTRACT: During the excavations of the Qinling extra-long tunnels, severe rockburst occurred in several sections, where the initial subhorizontal stress is about 20MPa–30MPa and the overburden is no less than 1000 m. The magnitude of the in situ stresses are related to the rock mass's...

... ABSTRACT: The variability of in situ rock stress is discussed in relation to different scales: the tectonic/regional scale, site scale, excavation scale, borehole/measurement scale, and microscopic scale. The factors causing the stress variability are rock inhomogeneity, rock anisotropy...