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三主応力下における有明粘土の強度変形特性


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Title: 三主応力下における有明粘土の強度変形特性
Other Titles: On the Strength.and Deformation Characteristics of Ariake Clay under Three-Dimensional Stress Conditions
Authors: 棚橋, 由彦 / 川口, 浩 / 持下, 輝雄 / 浅岡, 哲彦 / 吉良, 栄一
Authors (alternative): Tanabashi, Yoshihiko / Kawaguchi, Hiroshi / Mochishita, Teruo / Asaoka, Tetsuhiko / Kira, Eiichi
Issue Date: Jul-1986
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, 16(27), pp.165-174; 1986
Abstract: This paper presents an experimental study of the influence of the intermediate principal stress on the pore pressure, deformation and strength characteristics of normally consolidated undisterbed cohesive soil under undrained condition. Consolidated-undrained true triaxial tests with independent control of three principal stresses were performed on cubical specimens of Ariake Clay, i. e., alluvial marine clay, which is well-known as one of the most problematic soils in Kyushu District because of its high plasticity and high sensitivity. Forthermore, we compared with observed behavior and calculated one by some elasto-plastic model proposed previously. From the test results, we have clarified some characteristics of Ariake Clay as follows. 1) The pore pressure monotoniously increases with increasing shear loading and remains constant about 70% of the intial consolidated pressure. 2) The pore pressure at failure increases and is reached rapidly under shear stress with increasing b-values. 3) The plane strain condition may exist within the range 0.3 to 0.5 of b-value. 4) The strain-to-failure is greatest(18.8%) for triaxil compression(b=0), decreases with increasing b-values and is smallest (4.9%) for triaxial extension (b=1). 5) The directions of the strain increment vectors do not coinside with the directions of principal stresses, even from the early stage of shear loading. 6) The effective strength can be modeled fairly better by the failure criterion proposed by Matsuoka and Nakai rather than those by Lade and others.
URI: http://hdl.handle.net/10069/24217
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 16, No. 27

Citable URI : http://hdl.handle.net/10069/24217

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