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Showing 1 to 10 of 10 for “"stiff clays"”.
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Pressuremeter testing in miocene stiff clays
… difficult to obtain reliable soil parameters for stiff clays. Laboratory testing results are often scattering due to the fissures and slickensides in these soils. Alternatively, in situ techniques offer a means to test the soils in place. This study focuses on in situ testing in Miocene stiff …
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Mechanisms of strength loss in stiff clays
On September 14, 1981 a major slide was discovered in the upstream slope of San Luis Darn, located about 100 miles southeast of San Francisco, California. The slide occurred at the end of a period of rapid drawdown of the reservoir. Although this was the longest and fastest drawdown in the life of …
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Movement of landslides in stiff clays and clay shales
… test data on undisturbed and remolded soft- to stiff- clays, reported in the literature, were analyzed. An empirical correlation for secant residual friction angle for a wide range of clay compositions with plasticity index in the range of 10 to 250%, was extended to 8 different effective normal …
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Drained shear strength of stiff clays for slope stability analyses
… involving previous and no previous sliding in stiff clays, and develop empirical relationships that describe the stress-dependent nature of the residual and fully softened shear strengths in terms of soil index properties. To investigate the drained residual strength, a Bromhead ring shear …
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Determining parameters for stiff clays and residual soils using the self-boring pressuremeter
As testing stiff soils in the laboratory often leads to information which is not consistent with field performance, research was undertaken to determine in situ the soil properties. Among the devices which generated interest is the self-boring pressuremeter (SBPM). In this research, two stiff soils …
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Meaning, measurement, and field application of fully softened shear strength of stiff clays and clay shales
… remolded, normally consolidated specimens of 15 stiff clay and clay shale compositions. The fully softened shear strength data interpreted from laboratory tests reported in the literature on reconstituted, normally consolidated specimens prepared from 71 materials, including soft to stiff clays, …
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Movement of Reactivated Landslides
… slow"" moving reactivated landslides in stiff clays and clay shales, is typically controlled by fluctuations in piezometric levels; the relations between rate of movement and piezometric levels and factor of safety (proportional to inverse of shear stress level) are investigated. For the …
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Use and Measurement of Fully Softened Shear Strength
… Back-analyses of first-time failures in cuts in stiff-fissured clays and embankments constructed of fat clays have shown that, over a long period of time, the shear strength gets reduced from what is measured in the laboratory using undisturbed samples to the fully softened shear strength. These …
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Lime treatment to improve frictional resistance and stability of stiff clay slopes
… of first-time or reactivated landslides in stiff clays and shales, permanent changes in the size and shape of clay particles must be realized to increase drained frictional resistance. Lime-soil reactions that may produce less platy and larger soil particles begin and continue with time …
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Prediction of instability and ground movements during tunnel construction in non-homogenous conditions
… i) undrained failure in low permeability clays with continuous and discontinuous (mixed face) strength profiles; and ii) drained shearing in high permeability sands above and below the water table, where the closed-face conditions at the tunnel face provide an impermeable membrane. The …