2 edition of Stress Determination From Strain Relief Measurements on the Ends of Boreholes found in the catalog.
Stress Determination From Strain Relief Measurements on the Ends of Boreholes
Canada. Dept. of Energy, Mines and Resources. Mines Branch.
|Series||Canada Mines Branch Reprint Series -- 110|
|Contributions||Gray, W.M., Barron, K.|
It is Stress and Failure of Inclined Boreholes. Stress and Failure of Inclined Boreholes listed as SFIB. Stress and Failure of Inclined Boreholes - How is Stress and Failure of Inclined Boreholes abbreviated? Ends with; Text; A; A; A; A; Language: stress and strain; Stress and Volume Testing; Stress Assessment Battery; stress axis. L. Teufel, “Determination of in situ stress from partial anelastic strain recovery measurements of oriented cores from deep boreholes,” in Proceedings of the 34th US Rock Mechanics Symposium on Short Course Modern In Situ Stress Measurement Methods, pp. 27–30, June View at: Google Scholar.
stress with depth within individual boreholes provides some constraint on the average shear stress in the brittle crust and on far-field loading mechanisms [McGarr, , ' Zoback et al., ' McGarr et al., ]. In order to obtain the direct stress measurements needed to resolve the magnitude of the. The determination of the true stress-strain curve using hardness indentations Graduate report Carel ten Horn Supervisors: measurements. The stress-strain curve is usually obtained by a tensile test. In order to perform a tensile test a large amount of material is needed. Moreover expensive equipment is .
Strain concentrationfactor.-The strains er, ee,and 7 are, found the stressesthroughthe stress-strain.-> The strainsare: 7= At the hole where Ue-— % E.— 2.e Es 3T “7=— Es relations (“a2 cm ES $+ —— — as 2 + (Es)w 2 m the strainconcentration ‘==’ “,+2!*2! (Es)m crm/(Es) ‘ES? a, 7(/2 w The. Shear stress Technical summary: Hole drilling is a method for determination of near-surface residual stress in a material. The method can be applied to quantify the average residual stress over the depth of the hole (appx. mm) or incremental hole drilling can be performed to determine the distribution of residual stress versus depth from.
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Int. Rock Mech. Min. Sci. Vol. 5, pp. Pergamon Press Printed in Great Britain DETERMINATION OF THE STRESS IN ROCK UNAFFECTED BY BOREHOLES OR DRIFTS, FROM MEASURED STRAINS OR DEFORMATIONS Y.
HIRAMATSU and Y. OKA Department of Mineral Science and Technology, Kyoto University, Kyoto, Japan (Received 25 August ) Abstract--The Cited by: The elastic stress- strain relationship on the end face of the borehole in any given radial direction r can be written, for plane stress conditions: E, E = a, --/z or0 (8) RELIEF MEASUREMENTS IN HEMISPHERICALLY ENDED BOREHOLES where E is Young's modulus, tz again is Poisson's ratio and g0 is the stress normal to or, in the borehole by: 2.
Determining residual stresses in materials (e.g. during casting, welding and forming processes) becomes easy with HBM's special strain gauges.
These special strain gauges for residual stress analysis are available for precise and safe high-speed drilling (in combination with the MTS drilling device from our partner company Sint Technology). strain cell assembly used to obtain the strain measurements from which the in situ stresses can be stress relief in boreholes progressed during the s with the development of a variety of different instruments (LeemanHastObert, et al., ).Cited by: 1.
boreholes is also impeded by the difficulty of setting up cables for sensors (Yao ). In summary, advancements are still needed in areas including the determination of stress directions, measurements of lower depths, reducing complexity of the process, and generally realising the in situ stress measurementsAuthor: Chuanying Wang, Zengqian Han, Yiteng Wang, Jinchao Wang.
Stress field determination from local stress measurements by numerical modelling Article in International Journal of Rock Mechanics and Mining Sciences 46(1) January with Reads. Borehole Breakout And Stress Measurements.
and magnitude of in situ stresses and of strain–stress measurements in laboratory tests. of great stress concentrations at the ends of a.
The successful interpretation of stress relief tests depends to a great extent on the ability (1) to establish a stress—strain (or displacement) relationship for the rock, (2) to be able to determine rock mass properties from tests on samples and (3) to have instrumentation sensitive enough to capture small strains or displacements.
STRESS MEASUREMENT: THE GRC PERSPECTIVE These methods range from small scale strain relief and back analysis techniques, such as relief methods that can be applied at surface or in boreholes (e.g., see Chapter 5 in Amadei and Stephansson, ); in this paper, the focus is on the use of the thin-walled Commonwealth Scientific and.
The Borre probe is a unique tool for overcoring stress measurements. It allows three-dimensional stress determination in deep ( m or more), water-filled boreholes. The probe has been used extensively worldwide for the last 25 years, and has proven to be a reliable tool for measurements in both shallow and deep boreholes.
In this paper, the present version of the Borre probe and the. for estimating stress from core and boreholes as practiced in open-hole scientific drilling is reviewed and some recent experiences in stress determination shared.
This review focuses on core fractures, borehole imaging, and hydraulic fracturing and as such because it reflects the author’s experiences cannot be. residual stress is the hole-drilling strain-gage method of stress relaxation, illustrated in Figure 1.
Briefly summarized, the measurement procedure involves six basic steps: • A special three- (or six-) element strain gage rosette is installed on the test part at the point where residual stresses are to be determined.
Engelder, T., and M. Sbar: Determination of the regional stress patterns in New York State and adjacent areas by in situ strain relief measurements. Annual Tech. Rept. for New York State Energy Res.
& Development Authority, by Lamont-Doherty Geol. Observatory, Columbia University, Residual stress measurements by the The hole-drilling method: our solution The hole-drilling method allows accurate experimental stress analyses at moderate costs.
It consists in drilling a small hole (typically – mm) which changes the initial deformation allowing redistribution of the residual stresses locked in a material). : Analysis of accuracy in the determination of the ground-stress tensor by means of borehole devices (Reprint series): W.
M Gray: Books. Overcoring stress measurements in boreholes DBT-1 and DBT-3 were conducted within the construction area of the Forsmark Power Plant, and during the period of to The measurements were part of a research program, aimed primarily at testing the method of measuring rock stresses in deep, water-filled boreholes, developed by Vattenfall (the.
T1 - CONSTITUTIVE EQUATION FOR NONLINEAR STRESS-STRAIN CURVES IN ROCKS AND ITS APPLICATION TO STRESS ANALYSIS AROUND A BOREHOLE DURING DRILLING. AU - Morita, Nobuo.
AU - Gray, K. PY - Y1 - N2 - The stress-strain behavior of Berea, Ohio, and Pecos sandstone was measured intensively under triaxial loading paths. The hole-drilling method allows accurate experimental stress analyses at moderate costs.
It consists in drilling a small hole (typically – mm) at very high speed to induce an alteration in the stress state involving a change and a redistribution of forces within the structure. “ Stress perturbations associated with active faults penetrated by boreholes: Possible evidence for near-complete stress drop and a new technique for stress magnitude.
Only uniform stress measurements are specified for thin workpieces, while both uniform and non-uniform stress measurements are specified for thick workpieces. Stress Measurement Range: The hole-drilling method can identify in-plane residual stresses near the measured surface of.
z/D =only about 13 percent of the strain relief is caused by the stress in that depth increment. In the average stress method, the concept of an equivalent uniform stress that produces the same strain increment as the real nonuniform stress field implies that stresses at all given depth increments.Stress Concentration Produced by Holes and Notches By A.
M. WAHL1 a n d R. BEEUWKES, Jr.,2 EAST PITTSBURGH, PA. The problem of stress-concentration effects, produced by holes and notches in bars under tension is, of interest to machine designers.
The present paper describes photo elastic tests and strain measurements to determine these.Geostress measurements near fault areas using borehole stress-relief method testing system was introduced to conduct in-situ geostress measurements at three sites and nine points by the borehole stress-relief method.
The results of strain−confining pressure curves show that rock masses at the three measuring sites exhibit comprehensive.