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• W2000237580 abstract "Experiments were undertaken to verify, under high pressures, the linear relation postulated by Terzaghi between the equilibrium voidratio (∈) of a sediment and the logarithm of the applied pressure (p). Samples of Gault, Oxford Clay, Keuper Marl, Globigerina Ooze and Terrigenous Mud were subjected to maximum pressures between 250 and 840 kg/cm2. Certain departures were found from Terzaghi's relation. However, they do not appear to be such that large errors would arise in assuming the validity of Terzaghi's relation up to, say, 1 000 kg/cm2. The void-ratio at unit pressure (∈1) was found to be proportional to the compression index (the coefficient of the logarithmic term in Terzaghi's relation). This suggests that if sediments reach a state of no voids, the pressure at which it is reached is the same for all of them. From the data obtained in the present experiments a pressure of about 2 500 kg/cm2 is estimated for this state. Casagrande's suggestion that if an undisturbed pre-stressed sample of a sediment is re-subjected to pressure, the slope of the ∈-p curve would show a discontinuity at the pre-stress value was verified under high pressure. An estimate of the overburden eroded from the top of the Athleta zone of the Oxford clay is made from such experiments. Depth-density curves for the sediments concerned in the above experiments are presented. These calculations show that where compaction following Terzaghi's relation is the only process involved, the state of no voids is reached at about 10 000 m depth of burial. Theoretical calculations of the heat conductivity of a mass of porous sediments are given in the paper. It is shown that the conductivity of the first 10 m of Globigerina Ooze, a typical deep sea sediment, should be expected to be reduced to two-thirds that of the constituent grains, owing to the presence of the water-filled voids. The mechanism of compaction is discussed. An expression similar to Terzaghi's relation has been derived from certain considerations involving the energy needed to break the bonds between grains. The approach suggests that it should be possible to calculate the value of the compression index theoretically for a clay of known lattice structure." @default.
• W2000237580 created "2016-06-24" @default.
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• W2000237580 date "1960-03-01" @default.
• W2000237580 modified "2023-10-17" @default.
• W2000237580 title "The Compaction of Sediments and its Bearing on some Geophysical Problems" @default.
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• W2000237580 doi "https://doi.org/10.1111/j.1365-246x.1960.tb00062.x" @default.
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