VARIABILITY OF PHYSICAL AND CONSOLIDATION TEST RESULTS FOR RELATIVELY UNIFORM CLAY SAMPLES RETRIEVED FROM OSAKA BAY

SOILS AND FOUNDATIONS

TOMOHIDE MURAKAMI¹  YOICHI WATABE²  MASANORI TANAKA²  YASUNORI SHIRAISHI³ 

[1] Saeki Kensetsu Kogyo Co., Ltd.;Port and Airport Research Institute;Nippon Koei Co., Ltd.

关键词: clay;    consolidation;    soil parameters;    variation;    (IGC: C6/D6);   

DOI  :  10.3208/sandf.47.701

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(18)Samples collected from both Holocene and Pleistocene layers in Osaka Bay were examined in this study. The objective of this study is to evaluate variations of soil parameters in a sample length of about one meter. The retrieved samples from EL. (elevation) −37.5 to −38.5 m and from EL.−125.5 to −126.5 m with a length of about one meter were divided into every 25 mm long to trim consolidation specimens. Variations of soil parameters obtained from laboratory tests were evaluated. Clay microfabric was also evaluated by scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). The clay layers are relatively homogeneous with variation coefficient CV in a range of 0.025 to 0.12 for the consolidation parameters (e, p′c, Cc and cv). CV of void ratio e is only 0.025 to 0.056. In contrast, CV values of the other consolidation parameters are significantly greater than this, but the average is less than 0.1. It can be concluded that CV of soil consolidation parameters for the homogeneous natural clay deposits dealt in this study is less than about 0.1. These variations are mainly influenced by sedimentary environment. Even the soil is said to be homogeneous, because the specimen size for the laboratory tests is sufficiently large in consideration of microscopic heterogeneity obtained from SEM and MIP.

【 授权许可】

Unknown