上総層群中部層シルト岩の強度・変形特性

概要

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The purpose of this paper is to investigate the strength and deformation characteristics of the Neogene siltstone sampled from middle formation of Kazusa group. The following results are obtained by triaxial compression tests on the variable confining pressure changed for wide range under undrained (UU and <CU>^^^-) and drained (CD) conditions. (1) The stress-strain curve in overconsolidation range shows clearly strain hardening-softening character regardless of undrained or drained conditions. And the curve shows strain hardening character under drained condition and strain hardening-softening character under undrained one in normal consolidation range. (2) Though the path of effective stress shows the peculier behaviour of soft rock in overconsolidation range, the path is recognized the same tendency as alluvial clay in normal consolidation range. (3) It is recognized that most of failure is brittle type in overconsolidation range, and "cast shape" failure or shear failure unless volumetric change depend on undrained or drained conditions in normal consolidation range. (4) The preconsolidation stress of Kakinokidai formation is assurned from 35 kgf/cm^2 to 40 kgf/cm^2 by the results of triaxial compression test and constant strain rate consolidation test.
一般社団法人日本応用地質学会の論文
1993-12-10