... borehole seismic imaging technologies with increased focus on the regions of increased stress can greatly improve the assessment of high risk mine subsidence areas. Upstream Oil & Gas surface subsidence investigation velocity range Reservoir Characterization claystone floor borehole...

... and shear) and poro-elastic consolidation of the intact rock matrix equally contribute to the observed magnitudes and shape of the surface subsidence trough. RÉSUMÉ Des tassements aux dessus de massifs cristallins sont rarement observes et par le passe les geotechniciens ne prevoyait pas de subsidence...

... largely ignored. Some ten to twenty years on, excessive surface subsidence is occurring over workings designed to be long-term stable. UNSW research outcomes into the geotechnical behaviour of the mining environment are reviewed in this paper especially in respect of soft strata. BACKGROUND A typical...

... ABSTRACT: There are unconsolidated layers with more than 100 m thickness of Cainozoic era vastly existed in Huang-Huai plain of China. Deformation and subsidence of the unconsolidated strata are major causes of not only surface subsidence in cities such as Shanghai, Hangzhou, Tianjin etc...

... influences on the ground surface. Consider an extreme case where the underground excavation has totally collapsed. The maximum ground surface subsidence will be reached after an infinite time following the total collapse. In this case the elementary subsidence we induced by the elementary excavation can...

... an effect. In addition to the underground stress effects, the condition (failed or intact) of the sill dominates the magnitude of surface subsidence. In general, the magnitude of subsidence in South Africa is about half of the mining height where the sill is either absent or where it fails. Where the sill...

... ABSTRACT: It is known that pumping of deep groundwater which contains natural gas has caused surface subsidence. And, houses, roads, bridges etc. on the ground have been often damaged. Surface subsidence in natural gas fields has been caused by extensive decline in water level(piezometric head...

..., and converg.nce, 0.0 0.25 0.50 1200 O"MQX /q1.0 SP"lQX 1M Z ,/ /1 // i1 ,/ , ;fc 0.:5 o o 200 I./M/M sM/M O"M/q 400 600 Figure 3. Normalized maximum (i.e. at the center of the panel) convergence, sm/M, surface subsidence, w./M, and goaf pressure, 0m/q, as functions of panel span, 2L. w/w eon""genu (s/ P ur...

... semi-empirische Modelle und deren Verwendung besprochen und an Hand eines Beispieles veranschaulicht. 1. INTRODUCTION There are essentially two procedures for the prediction of mining induced surface subsidence. The first of these is entirely empirical, being based on a large body of field...

... of this behaviour on fluid production, compaction and surface subsidence are illustrated. RESUME: Une serie de tests sur le fluage à ete realisee sur des carottes ayant ete extraites d'un gisement geothermique profond sous pression geostatique. Sous l'effet de l'application de contraintes hydrostatiques et de...

.... Artificial Intelligence surface subsidence metals & mining Upstream Oil & Gas Reservoir Characterization Modeling & Simulation element model extraction prediction eastern australia discontinuity subsidence geotechnical model reservoir geomechanics colliery mesh test result...

... twin tunnel clay layer perimeter trough Upstream Oil & Gas Thickness tunnel structure surface subsidence prediction cohesive soil centerline construction technology shield determination settlement clay cover soil condition tunnel intensity deformation ANALYSIS...

... coalbed methane drilling operation metals & mining complex reservoir influence factor coal bed methane Directional Drilling Simulation horizontal displacement mined space mean depth precalculation limit angle coal seam gas relative position surface subsidence subsidence dip...

... of a dyke or dykes bounding or in the proximity of the area that was being depil- lared, the draw towards them at the surface could be delayed for some time subsequently to be extended to the line of dyke. Such extension of surface subsidence occurred after 2 to 2 1/2 years of the first break. (iii...