Results 211 to 220 of about 83,864 (261)

Advance of In-Situ Stress Measurement in China

Journal of Rock Mechanics and Geotechnical Engineering, 2011
In-situ stress is an essential parameter for design and construction of most engineering projects that involve excavation in rocks. Progress in in-situ stress measurement from the 1950s in China is briefly introduced. Stress relief by overcoring technique and hydraulic fracturing technique are the two main techniques for in-situ stress measurement in ...
Meifeng Cai
exaly   +2 more sources

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In‐Situ Stress Measurements in Singapore

Chinese Journal of Geophysics, 2012
AbstractIn the year 2008 and 2009, in‐situ stresses were measured in 18 boreholes by the hydraulic fracturing method to determine the present‐day stress state of the shallow crust in Singapore, which provide key parameters for the design and construction of underground tunnels and data for the study of world stress environments.
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In Situ Stress Measurements in Italy

1980
Most of the in situ natural state-of-stress measurements have been carried out in Italy at the sites of large underground hydroelectric powerhouses and at the sites of important mines. The method successfully used was in all cases based on the measurement of the deformations caused by the stress release on the bottom of boreholes.
Sandro Martinetti, Renato Ribacchi
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The in situ measurement of the intrinsic stresses in nanofilms

Nanotechnologies in Russia, 2010
A method for the in situ measurement of intrinsic stresses in nanofilms is described. It is based on measuring the cantilever beam deflection during the vacuum deposition of thin films. Magnetron sputter deposition is used in this work. In order to determine the cantilever beam deflection, the capacity of a capacitor composed of a stationary plate ...
G. P. Egorov, A. A. Volkov, A. L. Ustyuzhaninov   +2 more
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Deep in-situ stress measurements by hydrofracturing

Tectonophysics, 1975
Abstract Hydrofracturing is a recently developed in-situ stress-measuring method. It consists of hydraulically pressurizing a sealed-off interval inside of a borehole until fracture initiates. The fracture is then extended by additional pumping of fluids from the surface.
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In-Situ and Ex-Situ Measurement of Stresses in Environmental Barrier Coatings

Volume 2: Ceramics and Ceramic Composites; Coal, Biomass, Hydrogen, and Alternative Fuels
Abstract Ceramic Matrix Composites (CMCs) offer a step improvement in temperature capability over the current best high temperature super alloys for gas turbine applications. Silicon Carbide (SiC) based CMCs react with water vapor at temperature and therefore need an Environmental Barrier Coating (EBC) for protection against the water ...
Hans Hudyncia, Jun Shi, Weizhou Li, Xiaodong Li   +3 more
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In-situ stress measurements of sputtered multilayers

SPIE Proceedings, 2010
The mechanical stress induced during the growth of thin films and multilayers is a critical parameter for the fabrication of reflective x-ray optical elements. Strong stress can cause deformation of the optical surface, de-lamination of the respective coating, or even breaking of the underlying substrate. In order to characterize stress in a growing
Ch. Morawe, J.-Ch. Peffen, K. Friedrich
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17. Measurement of in situ Stress

1987
Publisher Summary The state of stress in situ is the result of the superposition of a number of stress fields. This chapter describes the major methods of in situ stress measurement. They have been arranged in three groups: surface, near-surface, and deep methods. Surface measurements of in situ stress are those conducted directly on the free surface
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In-Situ Stress Measurements During Drilling

Journal of Petroleum Technology, 1986
Summary This paper describes the results of six microfracturing experiments in a gas well in south Texas. The experiments were conducted in open hole and during the drilling operations. Microfracturing consisted of pumping very small volumes of drilling mud (tens of gallons) at very low rates (3 to 30 gal/min [189 ...
A.A. Daneshy, G.L. Slusher, P.T. Chisholm, D.A. Magee   +3 more
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Analysis ofin-situ stress measurements

Geotechnical and Geological Engineering, 1997
In order to analysein-situ stress measurements two approaches are discussed. These are eigen-value analysis and statistical techniques such as Arnold, Fisher and Bingham distributions. When these techniques are applied to field data, the results are quite consistent.
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