Geotechnical Properties of a Very Dense Glacial Till

Radhakrishna, H.S.; Klym, T. W.

doi:10.1139/t74-040

Cited by 24 publications

(8 citation statements)

References 2 publications

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“…In a survey of dense till, Radhakrishna and Klym (1974) found that the undrained shear strength, as obtained by pressuremeter and plate loading tests, averaged around 1.6 MPa, while the values from triaxial tests ranged between 0.75 and 1.3 MPa. The average values of the initial modulus of deformation were around 215 MPa which was approximately twice the laboratory value.…”

Section: Glacial Deposits Tillmentioning

confidence: 99%

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Engineering geology of Quaternary soils: I. Processes and properties

Culshaw

Cripps

Bell

et al. 1991

EGSP

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Section: Glacial Deposits Tillmentioning

confidence: 99%

“…However, Saxena et al (1978) reported that the upper part of the varved clay of Hackensack Valley, New Jersey was highly overconsolidated.…”

Section: Fluvio-glacial Deposits; Stratified Driftmentioning

confidence: 99%

Engineering geology of Quaternary soils: I. Processes and properties

Culshaw

Cripps

Bell

et al. 1991

EGSP

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“…It is possible to determine the modern rheological characteristics of tills by conducting laboratory shear-strength tests (Radhakrishna and Klym, 1974). However, measured shear strength may differ from the original shear strength, as post-depositional weathering or cementation of Pleistocene tills can substantially alter their original rheological properties (Sladen and Wrigley, 1983).…”

Section: Till Yield Strengthmentioning

confidence: 99%

Modeling the Influence of Till Rheology on the Flow and Profile of the Lake Michigan Lobe, Southern Laurentide Ice Sheet, U.S.A.

Begét

1986

J. Glaciol.

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The late Wisconsin Shelbyville till was deposited in southern Illinois c. 20 000–21 000 year B.P. and records the maximum southern advance of the Lake Michigan lobe of the Laurentide ice sheet. The yield strength calculated for a representative till debris flow found just south of the ice margin is 8 kPa (0.08 bar), and probably approximates yield strength of basal Shelbyville till. An ice-profile model assuming plastic behavior in basal till suggests the southern Lake Michigan lobe may have been unusually thin. Reconstructed Laurentide glacier profiles from the south-west and western Great Plains (South Dakota, Alberta, Minnesota, and Montana), and the MacKenzie Delta, N.W.T., are similar to those inferred for the southern Great Lakes area, and much thinner than those of most modern ice sheets. The Pleistocene Laurentide ice sheet may have been asymmetric: thicker in the east than in the west. Glaciers resting on weak sediments can move both by subglacial sediment deformation (creep) and sliding at the sediment–ice interface. Till rheology is complex; shearing of till by over-riding glaciers would increase porosity and further reduce yield strength.

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“…First, if the agglomerated till is of too small a size or becomes rapidly dilatant (Radhakrishna and Klym, 1974), thus again increasing its pore-water content, the till will be eroded or fluidized and removed . Secondly, if the agglomerated till is large enough to withstand the shear stresses applied by the ice and does not rapidly become dilatant, the till may remain in position.…”

Section: The Proto-drumlinmentioning

confidence: 99%

The Mechanics of Drumlin Formation with Particular Reference to the Change in Pore-Water Content of the Till

Menzies

1979

J. Glaciol.

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ABSTRACT. M ost drumlins a re composed of till tha t a ppea rs simil a r in all cha racteristics to non-d rumlin till . Ev idence, h owever, in the fo r m of till layer seq uences and from palaeomagnetic K oenigsberger ratios in dicate tha t d rumlin t ill may have a slightl y higher pore-water content a t the time of lodgemen t than nond rum lin till. I n order that d eposited till remains at the ice-glac ier-bed interface to initia te dru mlin fo r mation, it m ust undergo rapid geotechni cal changes where by its pore-water content is d iss ipa ted thereby increasing the shear strength of the till. Two mech an isms of pore-water removal a re possibl e. F irstl y, pore water may be removed from localized pa tches withi n a mobile layer of till at the ice-glacier-bed interface, thus creati ng nuclei of higher-strength till a rou nd which deforming till may adhere. Secondly, removal of wa ter initially from the thin water film a t the base of a glacier may r esult in increased pressure mel ting of the ice leading to till m el t-out and subsequent loss of pore wa ter from the d eposited till. The loss of wa ter at the glacier bed may be either via permeabl e subglacial deposi ts or bedrock, or within subglacial depressions.R ESUME . L a micanique de la formation des drum lins avec une rifirence particulitre cl la teneur en eau capillaire de la moraine. La plupa rt des drumlins son t composes de materia ux morainiques qui paraissent semblables dans toutes leurs caracteristiques a ux materiaux mora iniq ues hors d rum lins. Des preuves cepend a nt ti rees de la for me d es sequences d es ni veaux morai niques et des rapports paleomagnetiques de K oenigsberger, montren t q ue la mora ine des drumlins peut avoir ete legerement plus rich e en eau capill a ire a u moment d e sa formation que la mora ine hors drumlin. Pour q ue la mora in e deposee reste a I' interface glace-lit rocheux pour entamer la forma tion de drumlins, elle doit su bir d e rapides cha ngements geotech niq ues qui lui fassent perdre sa teneur en eau capillai re ce qui accroit sa resista nce a u cisaillement. D eux mecanism es d e p erte de capacite capillaire sont possibles . T out d'a bord , I'eau d'i mbi bation peut d isparaitre pa r des cheminements localises da ns un niveau mobil e de moraine a I' interface glace-lit rocheux crean t a ins i des noyaux de moraine d e plus forte res.istance a uxquels la moraine en cours de deforma tion p eut adherer. Ensuite, la d ispa rition de I' eau qui constituait le m ince fi lm d'eau a la base du glacier peut provoq uer un accroissement du point de fusion de la gl ace conduisant a la fusion dans la moraine et par co nseq uent a la perte de capacite capilla ire d e la morain e deposee. La perte d 'eau le long du li t r ocheux peut se produire soit a travers de depots permeables sous glaciaires, ou le long du lit, ou a I' interieur d es depressions sous glacia ires. ZUSAMMENFA SSUN G. D er M echanismus der D rumlin-Bildung lmter besollderer B eriicksichtigung diS W eehsels imPorenwassergehalt des Sehuttes. Di...

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Geotechnical Properties of a Very Dense Glacial Till

Cited by 24 publications

References 2 publications

Engineering geology of Quaternary soils: I. Processes and properties

Engineering geology of Quaternary soils: I. Processes and properties

Modeling the Influence of Till Rheology on the Flow and Profile of the Lake Michigan Lobe, Southern Laurentide Ice Sheet, U.S.A.

The Mechanics of Drumlin Formation with Particular Reference to the Change in Pore-Water Content of the Till

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