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Keywords: vertical stress
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Proceedings Papers
Numerical Modelling Of Rock Loaded To Failure Above Underground Cavities
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Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-545
... Waltham strength Nottingham mechanical property failure load cavity roof situ test triassic sandstone stability cavity underground cavity vertical displacement vertical stress numerical model failure mechanism 1 SChEME, University of Nottingham, University Park, Nottingham, NG7 2RD (UK) 2...
Proceedings Papers
Vertical Stresses Around A Drift Excavated In Sedimentary Rock Determined By The Acoustic Emission Technique
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Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-612
...VERTICAL STRESSES AROUND A DRIFT EXCAVATED IN SEDIMENTARY ROCK DETERMINED BY THE ACOUSTIC EMISSION TECHNIQUE Masahiro Seto1, Nobuyuki Maeda2 and Kikuo Matsui3 ABSTRACT In this paper we evaluate the possibility of the acoustic emission (AE) technique to measure in situ vertical stresses around...
Proceedings Papers
Resilient Modulus Of Eps Material Used As A Pavement Subgrade
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Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-068
... and holding an axial static load on the specimen, then applying cycles of loading and unloading of the specified vertical stress (defined as dynamic stress). For this reason, the deviator stress in the above equation equals the dynamic stress. The loading profile is illustrated in Figure 1. (a) (b) Figure 1...
Proceedings Papers
Behaviour Of Anisotropic Clays Inside The State Boundary Surface
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Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-191
.... Horizontal stresses h are smaller than vertical stress during deposition. Material properties such as stiffness, strength and hydraulic conductivity are different in the vertical and horizontal directions, but are essentially constant in all horizontal directions. This leads to the particular form...
Proceedings Papers
K0 Development In Kaolin-Bentonite Mixtures
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Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-209
... hydraulic gradient of 0.2 kPa/mm in a purposely built consolidometer and measurements from flush diaphragm transducers gave the total vertical stress and total lateral stress on the sample. The equipment used has previously been described in Ting, Sills and Wijeyesekera (1994). Experimental observations...
Proceedings Papers
Compressibility Of Auckland Residual Soil
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Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-220
... and Operations compressibility oedometer test auckland site kPa vertical stress triaxial test Auckland compression COMPRESSIBILITY OF AUCKLAND RESIDUAL SOIL Michael J. Pender1,3, Laurence D. Wesley1, Graeme Twose2, Graeme C. Duske1 and Satyawan Pranjoto1 ABSTRACT This paper presents compressibility...
Proceedings Papers
Some Remarks On The Shear Strength Of Neapolitan Pyroclastic Deposits
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Paper presented at the ISRM International Symposium, November 19–24, 2000
Paper Number: ISRM-IS-2000-506
... were carried out. It was observed that a rise of saturation degree (wetting) always leads to a contraction of the sample, no matter what the applied net vertical stress. Therefore these soils are known as collapsible. Furthermore the material behaviour is work hardening, showing a clear peak at low...
Proceedings Papers
Design For the Rehabilitation of a Concrete Lined Shaft Damaged By Plastic Deformation
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Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-007
... of 2.5 months. Upstream Oil & Gas concrete lining Reservoir Characterization steelwork shaft column MPa metals & mining operation shaft pillar strength lining design limit shaft pillar Anchor lava deformation excavation vertical stress plastic deformation level station...
Proceedings Papers
In Situ Stress Determinations In Mines Located In Two Major Structural Domains In South Africa
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Paper presented at the ISRM International Symposium, September 10–12, 1990
Paper Number: ISRM-IS-1990-023
... stress field structural domain Magnitude namaqualand metamorphic complex South Africa deposit carolusberg vertical stress province principal stress Broken Hill Reservoir Characterization Situ stress Determination stress determination Upstream Oil & Gas sigma 1 reservoir...
Proceedings Papers
Fracturing Gradient, Sonic Compaction And Related to Undercompaction Pressure Relationships In Clays And Shales
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Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-184
... be made between the shales sonic compaction value (T) and the fracturation gradient to vertical stress ratio (FG/σ1). This ratio tends to 1 upwards, above 500 m. At top of undercompaction, this ratio exceeds always 0.8. Within the undercompacted zone, the FG/σ1 ratio increases with the formation pressure...
Proceedings Papers
Rock Mechanics of the Deep Borehole At Gravberg, Sweden
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Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-109
... to the surface both the maximumand mi.nimumhorizcntal stresses, ~ and ~ respectively, are larger than the assuned vertical stress, where the vertical stress is calculated fran the weight of the ove.rb..1rden. The orientaticn of the maximumhorizcn- tal stress at StajsAs as inferred fran strikes of vertical...
Proceedings Papers
Investigations Into Foundation Failure Mechanisms of Hard Rock Squat Rib Pillars
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Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-067
... be seen in this figure, the changes in vertical stress and displacement along a horizontal line 100 m above the reef are insignificant compared to those along the reef horizon. Furthermore, horizontal symmetry conditions occur along the vertical centrelines of the pillars. For modelling purposes...
Proceedings Papers
An Interpretation of Highly Scattered Stress Measurements In Foliated Gneiss
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Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-045
... representing the average stress tensor. Brown and Hoek (1978) and others have shown that the vertical stresses in any region fall close to the level required for equilibrium of the overburden stress, whereas the horizontal stresses only rarely comply with elastic solutions based on no lateral strain...
Proceedings Papers
Rock Stress Determinations With the STT And SFJ Techniques
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Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-026
... tensor tube Reservoir Characterization rock stress determination stress determination rock mass interpretation reservoir geomechanics vertical stress initial state horizontal stress stress measurement STT Alto Lindoso strata tunnel Proceedings of the Intemational Symposium on Rock Stress...
Proceedings Papers
Changes of Ground Stresses With Depth In the Canadian Shield
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Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-006
... Abstract: In the Canadian shield a "normal" and an "extreme" population has been observed during the analysis of 54 ground stress tensors. For the "normal" population the vertical stress components are close to overburden load, whereas the "extreme" population shows vertical stresses far...
Proceedings Papers
Three-dimensional Finite-element Analysis of Crustal Stress Field On a Global Scale
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Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-014
... not only along the earth''s radius but also along the tangent of its meridian circle is considered in the calculation. The gravity (including the gravitation and the centrifugal inertial force) is taken for external load. As a result, the regularity that the horizontal and vertical stress varies with depth...
Proceedings Papers
Hydraulic Fracturing Testing Method For Rock Stress Measurements In Italy
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Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-034
... cavity rock specimen vertical stress tunnel Italy Proceedings of the Intemational Symposium on Rock Stress and Rock Stress MeasurementsiStockholrn/I-3 September 1986 Hydraulic fracturing testing. method for rock stress measurements in Italy G.BARLA Polytechnic of Turin, Italy P. BERTACCHI...
Proceedings Papers
Measurement of In Situ Stress In Coal
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Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-057
.... The measured stresses are characterised by a near vertical principal stress equal to the overburden pressure, and two horizontal stresses of different magnitudes both less than the vertical stress (except at very shallow depths). Alignment of measured stresses with cleat in the coal, local and regional...
Proceedings Papers
In-situ Stress Measurements of Rock By Stress Relief Method At Some Locations In Korea
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Paper presented at the ISRM International Symposium, August 31–September 3, 1986
Paper Number: ISRM-IS-1986-059
... current information on stress measurements in Korea. We have studied the variation of average horizontal and vertical stresses with depth in various geologic conditions and calculated the ratio of maximum to minimum principal stresses. We also discussed the relation between the principal stresses...
Proceedings Papers
Settlement Analysis of Foundations On a Complex Geological Profile
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Paper presented at the ISRM International Symposium, September 21–24, 1981
Paper Number: ISRM-IS-1981-110
... or settlement may be estimated from the expression: 677 (1) where mv is the coefficient of volume compressihility (=l/F), ~ne fiq is the change in vertical stress with ~enth. Experimental studies hy Sowers and Vesic (1962) have indicated that there are limi- tations to the applicahility of the theor- etical...