Triaxial Compression and Extension Tests on Remoulded Saturated Clay

Abstract

Synopsis A series of drained and undrained, compression and extension tests have been carried out on Weald Clay, using the triaxial cell. The soil was remoulded at a high water content and normally consolidated or overconsolidated before testing. It is shown that the stress-strain and volume-change characteristics depend upon the overconsolidation ratio, the nature of the external stress change, and the drainage conditions. The effective stress Mohr failure envelopes and Hvorslev parameters are, for practical purposes, independent of the type of test. A limited number of drained and undrained compression tests on London Clay showed, in general, similar behaviour to compression tests on Weald Clay. On a fait une série d'essais drainé et à teneur en eau constante, de compression et de dilatation sur de l'argile du Weald en utilisant la cellule triaxiale. On a conditionné le sol à une teneur en eau constante élévée, et on l'a consolidé et surconsolidé avant les essais. On s'apperçoit que les caractéristiques de tension-déformation et de changement volumétrique dépendent de l'indice de surconsolidation, de la nature du changement de tension externe et des conditions de drainage. Les enveloppes de tension de rupture Mohr effective et les paramétres Hvorslev sont, au point de vue pratique, indépendant du genre d'essai. Un nombre limité d'essais de compression drainés et à teneur en eau constante sur de l'argile londonnienne ont montré, en général une maniére de se comporter semblable à celle des essais sur l'argile de la Weald

Degradation in Cemented Marine Clay Subjected to Cyclic Compressive Loading

“…It can be seen that the samples tested at higher cell pressure have failed before reaching the failure envelope plotted and extended from the tests with lower cell pressures. The results of a series of compression tests on weald clay, reported by Parry (1960), show a similar phenomenon, and this can be seen from these reported results reproduced in Figure 3. The parameters defining the critical state line were therefore determined using the normally consolidated soil samples and were found to be…”

Crack initiation in clay observed in beam bending

“…Early work on triaxial extension tests was performed by Parry (1960) on saturated Weald clay. This work demonstrated that the failure points of saturated clay in both drained extension tests and undrained extension tests (in which the back-pressure had been elevated to maintain positive pore water pressures) satisfy Hvorslev's failure concept (Hvorslev, 1937).…”

An improved version of barodesy for clay

“…The model provides realistic results, as compared with experimental results of various clay types. Mašín [18], data by Parry [22]) and numerical simulation with barodesy. The consolidation pressures are r 2 ¼ À69:45 kPa and r 2 ¼ À206:2 kPa with the initial void ratios eini ¼ 0:572 and eini ¼ 0:622. e 1 versus q plot in a, e 1 versus e vol plot in b Fig.…”

“…The major (a) (b) Fig. 6 Undrained triaxial compression of Weald clay (according to Mašín [18], data by Parry [22]) and numerical simulation with barodesy. The initial states of the normally consolidated and overconsolidated samples are e 0 ¼ 0:622 and e 0 ¼ 0:572.…”