~A

811039

8110hO

811041

between predicted and field equilibrium void ratios for available data on papmrmill sludge. ComBining initial and final effective over- burden ~essures with existing mrganlc fr~tions pete.its prediction of void ratios needed for ~ett!ement prediction using conventional soil mechanics theory.

811037 HYPOTHESIS FOR PROGRESSIVE FAILURE IN A ~ARL Cavot~zldis, S; SotiropotLlos, J Geotech Engng Div ASCE, V106, NOT6, June

i~0, P6~9-671

Discusses the phenomenon of an interm~ate ~tep sit~ated between peak and residual in the stress-strain dda~ram. This behaviour was observed in s1~-~ard direct shear and triaxial tests. The iml~licatiOn fc~ the progressive failure of slopes is explored and compared with field evidence.

811038 CYCLIC A~ STATIC LABORATORY TESTS ON DR~N CLAY

Andersen~ K H; Pool, J H; Brown, S F J Geotech Engng Div ASCE, VI06, NGT~, May

198o, ~99-~9

The pro~ect cam~rised 129 triaxial and 103 simple shear cyclic and static tests on plastic Drammen clay. The clay was preconsolidated above the in-sitU stresses to a vertical pre- consolidation stress of ~OOkN/sq m and unloaded to various consolidation stresses in order to produce overconsolidation ratios ranging from 1 to 50. Both static a~d cyclic test results are presented. All cyclic tests w~e after ter- mination of cyclic io~ding sUbjected to static loading. Apart from some special tests to study the effect of preshearing, the tests were run under undrained conditions.

EKPERIT..~ENTAL FOLDING OF ROCKS UNDER CONFININ~ PRESSURE, PART 8..=r~CED FOLDING OF UNCON- SOLIDATED SAND AND OF LUBRICA'..~O LAY~S OF LIMESTONE AND SANDSTONE

Friedman, M; Hugman, R }~ H; Haz*iln, J Geol Soc Am Bull, Part 1, Vgl, N~, May 1980,

P307-31~

Reports a study of experimental, faulted, drape folds in veneers of loose, dry, umcon- solidated sand and in multilithologlc layered sequences with lubrlca~ed interfaces produced under confining pressures up to 20OMPa at 2~d.-g C. The study addresses the questions of the litholcgic control and the Impor~anae of the process of bed~ir~ plane :~l'p.

VELOCITY CHA~ES ASSOCIATED WITH GENERALIZED TRIAXIAL DEFO~ATION OF PYROPHYLLITE

Sond~geld, C H; Gettlr~, I C; Spetzler, H A Pure AI~I Geo;hys, Vll8, N~, 1980, F97~-~89

P and S wave velocities ~ere meas~ed in dry and we% samples and the variation is discussed in terms of crack development during dilatancy. The orientatlc~ ard development of t h e failure plane was cor~cinuously observed with laser holo~al~. The study relates %o %he defcrma- tlon of fault got~e and gc~e-llke materials.

ED(PER!MENTAL DEFOR4ATION OF PARTIALLY ~ELTED GRANITE ROCKS AT 600-~OOD~ C AND 250MPa CONFINI~D PRESSURE

Paquet, J; Francois, P Tec%onOl~hyaics, V68, NI-2, i0 Sept 1980,

~131-1~6

8110h2 LOCKED IN S~I~LEsSES, CREEP A~D DILAT~-NCY OF ROCKS, AND CONST.ITI~ E~AT!ONS

Tan~ T K; Mang, W F ROck Mech, VI3, NI, Aug 1980, I~-22

A micro-theological analysis is presented of the defc~matlon characteristics of rocks based on the min~-sl and crystalline structure of igneOus metamorphic and some sedimentary rocks. The poly~ramalar structure of sandstone-type rocks is also considered. Torsional creep test results on Ichang sandstone are presented and analysed. A new method of testir~ is Ir~uced whereby the sample is subjected to a step wise loadlr~ fumctlon and the def~matlon measured as a fuz~tiO~ of t h e t~me. Tn %hls career creep as a fttr~tlo~ of stress ar~ time can be c~rtalr~ ed from tests on only one sample. A hy~esis is presented on the origin and formation of 'locked in' stresses. The release of internal strain energy is cOnsiderecl ~Ith reference %o published results, On ~he basis of experimental results and physical reasonir~ cOnstitutive equations are set up, which are three dimension- al gmneralisations of the ex~erlmental Grigga equation.

8110~3 DATA AC~JISITION UNIT FOR TRIAXIAL CC~SSION TEST MEA~%VI~S AND ALTERNATING SHEAR TEST MEASUREMENTS (IN FRENCH)

HulO, Y; Derva~x, 14 Bull Liaison Lab Ponts Chaussees, ~D_07, May-

June 1980, P93-I00

The equipment includes a microprocessor which accepts data from four tri~xial cells (or ~wo triaxial cells and two shear boxes) displaying results in tabular form and also producing punched tape, from which a com!m~cer can supply gral~hical outfit and intrinsic parameters for the soll under test.

811044 ROCK B~VIOUR DURING FAILURE: APPLICATION TO TEE INTERPRETATION OF TESTS ON T~ICK TUBES (IN FRENCH )

B~est, P; Bergues, J; ~DD'en Minh Duc Rev Fr Geotech, Ng, Nov 1979, I~12

DiscUSses the limitations of the Mohr-Coulcmb failure curve and PrOPOses a concept of strain softening be~viour, with a simple rheol~Ic mOdel to explain experimental data. The concepts are used to consider more complex lo~din~ ~rOblems. An urde~round cavity is modelled by ~onsiderir~ %he loading of a thick-walled rock cylinder.

81~0~ ~icT~oN ~ n FO~ ~ - m E ~ D!~ON

Boulon, M; Daz~e, F; FlavigDy, E Roy Fr Oeotech, Ng, Nov 1979, F27-~0

An incremental theological model for predictir~ the tundrai~i hehavlo~r of a hcm~ra~o%~ sa te - rated sample of sand or clay is ~n'esented, in- volving effective stresses amd inte~ranular prol~ies. Calculations are compared with trl- axial results for sands. A method for estimatir~ pare pressure d~stribution in earth structures with tundralnel co~itlons is developed and ~ 0 field applications are given.

8110~6 STRESS-STRAIN RE~!ONSHIP OF SOILS AS ANISO- TROPIC BC~ES UND~ THREE DIFFERENT PRINCIPAL STRESSES

Yoahida, S Soils FoI~, V20~ NT, March 1980, PI-II