Residual Strength Of Clay And Clay Shales By Rotation Shear Tests
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| Author | : Daniel P. LaGatta |
| Publisher | : |
| Total Pages | : 234 |
| Release | : 1970 |
| Genre | : Clay |
| ISBN | : |
The objectives of this investigation were to develop a rotation shear machine to measure the residual shear strength (constant shearing resistance at which material undergoes continuous deformation under a constant state of effective stress) of clays and clay-shales; investigate testing errors; and measure residual shear strengths of representative types of highly plastic clays and clay-shales. In the rotation shear test, torque is applied to the bottom of the specimen and two force transducers measure the couple necessary to maintain the upper half of the specimen stationary. Disc-shaped or annular specimens with thicknesses from 0.1 to 2.5 cm and outside diameters of 7.11 cm can be tested. Variations in residual shear strength were investigated for normally consolidated versus overconsolidated specimens, for specimens sheared at different rates of peripheral displacement, and for specimens prepared by several different remolding procedures. (Author Modified Abstract).
| Author | : Daniel P. La Gatta |
| Publisher | : |
| Total Pages | : 204 |
| Release | : 1970 |
| Genre | : Clay |
| ISBN | : |
| Author | : Frank C. Townsend |
| Publisher | : |
| Total Pages | : 130 |
| Release | : 1974 |
| Genre | : Clay |
| ISBN | : |
This report compares various laboratory procedures and equipment used for determining the residual strength of clay shales. The effects of testing apparatus, specimen type, normal load, and rate of displacement on the residual strength of various clay shales were evaluated by relations between residual strength and Atterberg limits, grain size, and mineralogy were examined. (Modified author abstract).
| Author | : PA. Gilbert |
| Publisher | : |
| Total Pages | : 23 |
| Release | : 1976 |
| Genre | : Annular shear tests |
| ISBN | : |
This investigation was an examination of the effects of testing apparatus, specimen type and density, normal stress, and sequence of loading on the residual strength of various clays and clay shales. Annular shear and repeated direct shear tests were conducted on intact shale specimens with precut failure planes, while comparison rotational shear tests were conducted on the same shale material subjected to various degrees of remolding. Test results indicate that comparable residual strengths can be obtained, regardless of equipment type and procedure or degree of remolding. Supplemental annular shear tests on residual clay and silty sand show that precutting of the failure plane or the specimen density has no effect on the ?r' value. The residual friction angle is independent of stress history and normal load [when greater than 2 kg/cm2 (1.96 x 105 Pa)].
| Author | : Daniel P. LaGatta |
| Publisher | : |
| Total Pages | : 35 |
| Release | : 1971 |
| Genre | : Clay |
| ISBN | : |
Rotation shear tests were performed with a device developed to measure residual shear strengths of clays clay shales, on annual specimens of remolded Bearpaw shale and remolded London clay. Rates of displacement in comparative tests, are expressed in peripheral velocities of the annular specimens. (Author).
| Author | : Ramond Nen Yong |
| Publisher | : ASTM International |
| Total Pages | : 721 |
| Release | : 1981 |
| Genre | : Shear strength of soils |
| ISBN | : |
| Author | : |
| Publisher | : ASTM International |
| Total Pages | : 353 |
| Release | : 1976 |
| Genre | : Soils |
| ISBN | : |
| Author | : William C. Haneberg |
| Publisher | : Geological Society of America |
| Total Pages | : 160 |
| Release | : 1995 |
| Genre | : Technology & Engineering |
| ISBN | : 0813741106 |
Ten papers address both empirical and analytical aspects of clay and shale slope instability. Among the topics discussed in detail are: limit equilibrium stability analysis, shear strength of clay and clayey colluvium, use of triaxial test data to evaluate viscoplastic slope movements, numerical modeling of pore pressure distribution in heterogeneous soils, rational analysis of rainfall and landslide movement patterns, the effects of hydrothermal alteration on slope stability, mudrock durability and stability considerations, and regional clay and shale slope stability problems in Italy.
| Author | : Don Charles Banks |
| Publisher | : |
| Total Pages | : 562 |
| Release | : 1975 |
| Genre | : Clay |
| ISBN | : |
Prepared for Office, Chief of Engineers, U.S. Army, Washington, D.C. and the Panama Canal Company
| Author | : William Heley |
| Publisher | : |
| Total Pages | : 116 |
| Release | : 1971 |
| Genre | : Clay minerals |
| ISBN | : |
