Notes on flat jack test in rock mechanics
WebOct 23, 2010 · Large flat jack tests are used to assess rock mass deformability in the design stages of large projects. The paper introduces a methodology for interpretation of the … WebThe Flat Jack method is a “cancellation” in-situ stress test method, in which a thin slot is cut into the rock surrounding an underground opening and a pressure gage is inserted into …
Notes on flat jack test in rock mechanics
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WebAug 17, 2024 · The test is used to measure the acting stresses or mechanical parameters of structures. It's based on the stress release in a small area of a structure by cutting on a plane perpendicular to the …
WebSep 21, 1981 · The flat jack test offered an approach in which, by testing rock deformability parallel to the rock surface, the tendency to rock disturbance may be less than for loading … WebSep 1, 2015 · The Flat Jack method is a “cancellation” in-situ stress test method, in which a thin slot is cut into the rock surrounding an underground opening and a pressure gage is inserted into the slot (Fig. 1a). The pressure in the flat jack is increased until the recorded strain relaxation of the sidewall is cancelled (Fig. 1b).
WebFinally, equilibrium is restored by inserting a device such as a jack in the slots. Then the jack is pressurized until all deformations have vanished. One of the most widely used jacking … WebOnePetro October, 2014. The deformability tests conducted by using plate jacking test, plate loading test, Goodman jack test and laboratory test show the comparison among different measurements and scale effects on deformability of rock mass. Plate load test, flat jack test and Goodman jack test give values of modulus of deformation which are 2 ...
WebJan 1, 2024 · The flat jack test is one of the oldest and simplest in situ stress measurement techniques that has generally fallen out of favour in current rock engineering practice.
WebSep 21, 1981 · The flat jack test offered an approach in which, by testing rock deformability parallel to the rock surface, the tendency to rock disturbance may be less than for loading tests perpendicular to the surface, because of restraint by in situ stress. cryptonight forksWebMay 1, 2004 · The NX borehole jack test is the most widely used method to determine the deformation modulus of rock mass in the field. The common borehole jack, also known … dutch apple dinner theater 2020WebJan 1, 2015 · Large flat jack test 1. Introduction In any analysis of rock mass mechanics, the deformation modulus is an important input parameter. The modulus of deformation describes the relationship between load (applied stress) and resulting deformations (strain) that include elastic and inelastic behaviour. dutch annexation of german territoryWebJul 31, 2024 · The flat jack test is mostly used today for in situ rock mass modulus measurements (ISRM 2007) and also for other in situ testing where pressure is applied to a large block, such as for in situ direct shear testing or other similar tests. cryptonight disable gpusWebIn-situ stress measurement test conducted in Khewra salt mine using Flat jack stress measurement technique. dutch apple bundt cake recipeWebApr 1, 1986 · ISRM: DEFORMABILITY-LARGE FLAT JACK TECHNIQUE Suggested Method for Deformability Determination Using a Large Flat Jack Technique 133 SCOPE 1. (a) This test method is intended for the assessment of the in situ deformability modulus of rock masses using flat jacks in slots which are cut in the rock mass with a disc saw or by line drilling a … dutch apple cakeWebAug 25, 1976 · A non-dimensional set of results is given which enables one to use the jack with confidence, in rocks of various stiffnesses. N. Current techniques to measure the deformability of rocks in place are the plate bearing test (references 1,3,6,16,22), the borehole jack test (7,10,11,12,15), the flat jack test (1), and the dilatometer test (7,18,21). dutch apple dinner theater 2020 schedule