Frictional instabilities in rock

Frictional instabilities in rock

51A Comparison of a simulated homogeneous deformation of an oohUc hmestone w~th experimentally deformed samples has shown that the typical patterns an...

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51A Comparison of a simulated homogeneous deformation of an oohUc hmestone w~th experimentally deformed samples has shown that the typical patterns and problems associated with the commonly used strata analysis methods may be the result of strata heterogeneity

842092 Composite flow laws derived from high temperature experimental data on limestone and marble Ferguson, C C

Teetonopkysics V95, N3-4, 10 June 1983, P253-266 The high temperature deformauon of Solnhofen hmestone and Carrara marble produces results that, when plotted as isothermal points on a log stress-log strain rate plot, fit two or more strmght hne segments instead of a single straight line It is suggested that constant strata rate data are best fitted by a single composite flow law formed by the addition of two power laws w~th the strain rate contnbuuons of the two components changing m response to stress Mlcrostructural evidence supports th~s composite flow law approach

842093 Analogies between the high-temperature deformation of polyphase rocks and the mechanical behavior of porous powder metal Tharp, T M

Tectonophysics V96, N3-4, 20 July 1983, P T I - T l l In some rock types one or more mechamcaily s~mdar mmerals may consmute a load-carrying framework, while other subordinate phases carry httle load If incompetent phases are more than one or two orders ofmagmtude weaker than the competent phases, the load-carrying framework behaves like a porous sohd The deformaUon propertms of porous powder metal can represent this because (1) the yield strength is analogous to the power law flow stress for rock deformed at high temperatures and (2) the correspondence pnnc~ple relating elastic and wscoelast~c deformation may be used to relate the Young's modulus of porous powder metals to the flow stress for Nabarro-Herrmg creep m rock

842094 Design and construction of a Block Test in closely jointed rock Cramer. M L. Black. M T

Proc 24th US Symposium on Rock Mechanics, College Station. Texas. 20-23 June 1983 P265-266 Publ AEG. 1983 An abstract of a paper presented at the Symposium A large scale Block Test has been developed as part of the Basalt Waste Isolation Project Design features include location o f the test block I 5m back from the tunnel face to avoid blast damage, installation of fiat jacks in grout boxes to allow removal and replacement m case of failure, use of a 275 ton capacity cable system to allow loading perpendicular to the tunnel face. and mstallatton of an electro-optical deformauon measurement system able to measure to an accuracy of 30 m~crons

842095 Rock mass deformational properties from a large scale Block Test Cramer. M L. Cunnmgham. J P. Klm. K

Proc 24tk US Symposium on Rock Mechanics, College Station. Texas. 20-23 June 1983 P267-270 Publ AEG. 1983 An abstract of a paper presented at the Symposium A large scale Block Test is being conducted as part of the Basalt Waste Isolation Project The primary measurement system to determine the rock deformauonal properties is the electro-optmal Basalt Deformauon Measurement System (BDMS) The deformauon moduh and Poisson's ratio have been determined at

ambient temperature at various confining stresses apphed m different onerltauons.

842096 Potential applications of the corejacking test to characterize the mechanical behavior of rock masses Blankenshlp. D A. Amadei. B. Suckney. R G

Proc 24th US Symposium on Rock Mechanics, College Station, Texas, 20-23 June 1983 P335-342 Publ AEG. 1983 Laboratory tests on small rock specimens to determine deformabdlty ofthe rock mass are generally inadequate m sltu tests are reqmred to understand the true nature of the rock mass Many m situ static tests already exist to determine rock mass deformability These include plate beanng tests, fiat jack tests. boreholejack tests and dllatometer tests A new static test called the corejackmg test has recently been developed The test is easily adapted for rock masses that can be ideahzed as homogeneous, hnearly elastic continua that exhibit ~sotroptc. transversely tsotrop~c, or orthotrop~c deformation characteristics

842097 Time dependent crack growth and failure in brittle rock Costm. L S, Mechoisky. J J

Proc 24th US Symposium on Rock Mechanics, College Station, Texas. 20-23 June 1983 P385-394 Publ AEG. 1983 An experimental study was earned out to relate stress corrosion crack growth to the ume dependent fadure of brittle rock. Subcnhcal crack growth studies were performed to relate crack growth velocity to the apphed stress and environmental cond~uons (temperature and water content) Umaxml compression tests were also performed The results of both sets of tests were analysed using a recently developed model The model was then used to predmt the results of the umaxml compression tests from the results of the crack growth tests

842098 Specified strain path testing of geologic materials Bogart. J A. Schatz. J F

Proc 24th US Symposium on Rock Mechanics. College Station. Texas, 20-23 June 1983 P473-477 Publ AEG. 1983 A techmque has been developed to produce a specified diametrical strain versus axml strata curve m a geologm material The techmque is able to produce strata path tests m a routine manner by using a digital computer directing a servo-controlled trmxml test apparatus Successful strata path tests have been performed on polycrystalhne hahte and tuff S u r f a c e properties

See also 842023. 842063 842099

Frictional instabilities in rock Teufe[, L W Proc 24th US Symposium on Rock Mechanics, College Station, Texas, 20-23 June 1983 P479-480 Publ AEG, 1983 An abstract of a paper presented at the Symposmm Examines the phenomenon of rock friction and the transmon from stable shdmg to st~ck shp, using laboratory friction experiments

8421OO Experimental and theoretical approach to friction in rocks at high pressure and temperature Alhetd. H J; Moehnng-Erdmann. G. Rummel. F Proc 24th US Symposium on Rock Mechanics, College Station. Texas. 20-23 June 1983 P481-488 Publ /IEG. 1983