scholarly journals Are corestones due to weathering and/or tectonism? Problems and suggestions

2020 ◽  
Vol 42 ◽  
pp. 29-52
Author(s):  
Charles Rowland Twidale ◽  
Juan Ramón Vidal Romaní
Keyword(s):  
Deformation Structure ◽  
Stiff Clay

Many of the so-called corestones have been developed from rocky blocks that have been apparently affected by subsurface physicochemical weathering that results in lamination, granulation, and eventually a puggy or stiff clay. The truth is that weathering takes advantage of a previous deformation structure and does not create it by weathering.

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

Inner soil heave of stiffened caisson during installation in soft-over-stiff clay

2021 ◽  
Vol 138 ◽  
pp. 104336
Author(s):  
Qi Wang ◽  
Xiaowen Zhou ◽  
Mi Zhou ◽  
Yuxia Hu
Keyword(s):  
Stiff Clay

Undrained bearing capacity of spudcan in soft-over-stiff clay after penetration

2021 ◽  
Vol 235 ◽  
pp. 109369
Author(s):  
Junhwan Choi ◽  
Beom-Seon Jang ◽  
Hanbaek Ju ◽  
Sungkon Han
Keyword(s):  
Bearing Capacity ◽  
Stiff Clay

Zoned Excavation of an Oversized Pit Close to an Existing Metro Line in Stiff Clay: Case Study

2015 ◽  
Vol 29 (6) ◽  
pp. 04014158 ◽  
Author(s):  
Yong Tan ◽  
Xiang Li ◽  
Zhijun Kang ◽  
Junxi Liu ◽  
Yanbing Zhu
Keyword(s):  
Stiff Clay

A Carbon Black Structure-Concentration Equivalence Principle. Application to Stress-Strain Relationships of Filled Rubbers

1971 ◽  
Vol 44 (1) ◽  
pp. 199-213 ◽  
Author(s):  
Gerard Kraus
Keyword(s):  
Carbon Black ◽  
Primary Structure ◽  
Equivalence Principle ◽  
Chemical Activity ◽  
Cross Linking ◽  
Surface Chemical ◽  
Deformation Structure ◽  
Carbon Blacks ◽  
Filled Rubbers ◽  
Dependent Factor

Abstract It is shown that various modulus values of carbon black reinforced rubber are functions of the product of the actual black loading and a structure dependent factor. The structure factor appears to be a linear function of the so-called 24M4 value of the dibutylphthalate absorption and is independent of elongation, temperature, and degree of cross-linking over the ranges covered by the data reported. An interpretation of the results is offered based on the idea of polymer occluded in the interstices of primary structure aggregates and thereby shielded from deformation. Structure-concentration equivalence can only be demonstrated with carbon blacks differing in (primary) structure alone. Deviations are observed whenever the carbon blacks compared vary significantly in specific surface area and surface chemical activity.

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