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Keywords: stress measurement
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Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-616
... excavated by a Tunnel Boring Machine (TBM). A comprehensive analysis of all results from rock stress measurements performed to date at Äspö HRL has been done. The magnitudes of rock stresses obtained from overcoring were higher than those predicted by hydraulic fracturing. Statistical analyses of the...
Proceedings Papers

Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-582
... ABSTRACT: The impact of stress on the performance of underground excavations is well understood and widely accepted. A large database of direct in situ stress measurements now exists in Australia for both complexly folded and faulted hard rocks and flat lying sediments. The paper draws on...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-181
... oil sand complex reservoir minimum principal stress bitumen Upstream Oil & Gas wellbore storage breakdown pressure kPa Drillstem Testing pressure data Workshop Injection Rate principal stress interpretation fracture micro-frac test stress measurement hydraulic fracturing...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-118
... great depth situ stress limestone stress measurement Haimson ABSTRACT: The effect of injection-fluid flow through the borehole wall on hydraulic fracture breakdown pressure was studied theoretically and in the laboratory, for both low and high permeability rocks, under initially dry or...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-124
... Mikrorissen. Laborversuche an Hohlzylindern wiesen ein anisotropes Verformungsverhalten des Granits nach. ABSTRACT: In the course of a cooperation between NAGRA, BGR, and GSF, the BGR has been working on the research project "Rock Stress Measurements" at the Grimsel Test Site (Switzerland). A vertical...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-125
... ABSTRACT: In situ stress measurements made between 1200 and 1500 meters depth at Minnova Inc.'s Ansil deposit resulted in highly unusual in situ stress tensors seemingly unrelated to the normal regional field stresses observed in the Canadian Shield. Further analysis of the field and numerical...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-117
... Upstream Oil & Gas borehole primary crack Injection Rate fracture hydraulic fracturing alo direction borehole wall axial fracture configuration wellbore wall orientation experiment Crack pattern dip angle tensile strength fracture initiation stress measurement stress field...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 12–16, 1988
Paper Number: ISRM-IS-1988-019
... several in situ stress measurements have been carried out in Spain by overcoring and fault or focal mechanisms. Empirical relationships have been investi- gated between the main contributing factors to the rock stresses and conceptual mathematical models, in order to find a simple empirical function appli...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-025
... INTRODUCTION This paper describes an instrument called the Auckland New Zealand Soft Inclusion (ANZSI) cell that was developed to measure in situ stress in coal. The instruments mode of operation is described together with the advantages that it offers for in situ stress measurements and stress change...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-045
...Proceedings of the International Symposium on Rock Stress and Rock Stress Measurements/Stockholm/1-3 September 1986 An interpretation of highly scattered stress measurements in foliated gneiss A.M. RICHARDSON Colorado School of Mines, Department of Mining, Golden, Colorado, USA S.M. BROWN Golder...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-005
..., Canadian, Indian). A comparison of stress measurement data obtained by various workers in different folded areas of the world showed close agreement with the data obtained from mountain areas of Tian-Shan and Pamir. RESUME: Cette communication présente l''état de contraintes naturelle des massifs...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-030
..., the potential for estimating stress magnitudes through analysis of the breakouts will be discussed. Breakouts reported in the Kola Penninsula hole in the Soviet Union will be analysed and the magnitudes of in-situ stresses estimated to depths of 11.6 km. Finally, a new stress measurement method will...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-015
... ABSTRACT: The use of a multiprobe unit for ground stress measurement is suggested in this paper. The working principle is analysed in detail and two fundamental formulas are derived there from, one for absolute and the other for relative stress measurements, which give the relationship between...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-026
... recent advances concerning apparatus, testing and result interpretation. A synthesis of the data collected by the LNEC about the initial stress fields in rock masses is presented, as well as some significant applications of rock stress measurements in the design of structures. RÉSUMÉ: La détermination...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-041
... & mining Lorraine statistical approach Statistic analysis Reservoir Characterization orientation Cerchar roadway Upstream Oil & Gas calculation procedure stress measurement interpretation hypothesis validity Rock Stress Measurement estimation reservoir geomechanics criterion...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-036
..., makes conventional hydraulic fracturing stress measurement difficult to carry out. The depth, coupled with the high temperatures, produces conditions too severe to use the borehole tools necessary for finding and isolating unfractured intervals as is conventionally done (e.g. Bredehoeft et aI, 1976...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-016
... ABSTRACT: The classical interpretation of hydraulic fracturing test results for in situ stress determination relies on a priori assumptions--assumptions that cannot always be justified. A brief description of the hydraulic fracturing stress measurement method is given, the assumptions made are...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-022
... ABSTRACT: For rock stress measurement, a borehole is commonly drilled and sensors, composed of photo elastic borehole plugs, flat jacks, vibrating wire gauges or load cells, are inserted. Conventional sensors generally suffer the shortcoming of being expensive and difficult to install and use...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-012
... impure salt, geologic structures and other heterogeneities. The inferred near-hydrostatic stress condition in salt domes is based on detailed integrated analyses of six different types of evidence -- in situ stress measurements; deformational behavior on sample, borehole and mining scales; salt...
Proceedings Papers

Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-007
... ABSTRACT: In situ stress measurement is one of the important methods for studying the recent tectonic stress field and the stress state in upper crust. Based on the data of in situ stress measurements, the author analyses the characteristics of recent tectonic stress field within China...

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