Grant-in-Aid for Scientific Research (B)
|Allocation Type||Single-year Grants |
|Research Institution||ISHIKAWA NATIONAL COLLEGE OF TECHNOLOGY |
NISHIZAWA Tatsuo ISHIKAWA NATIONAL COLLEGE OF TECHNOLOGY, DEPARTMENT OF CIVIL ENGINEERING, ASSOCIATE PROFESSOR, 環境都市工学科, 助教授 (00143876)
KOYANAGAWA Masashi TOKYO UNIVERSITY OF AGRICULTURE, DEPARTMENT OF REGIONAL AND ENVIRONMENTAL SCIENCE, ASSOCIATE PROFESSOR, 地域環境科学部・生産環境工学, 助教授 (00175340)
KAMIURA Masaki HOKKAI-GAKUEN UNIVERSITY, DEPARTMENT OF CIVIL ENGINEERING, PROFESSOR, 工学部・土木工学科, 教授 (10305899)
MURAI Sadanori TOHOKU INSTITUTE OF TECHNOLOGY, DEPARTMENT OF CIVIL ENGINEERING, PROFESSOR, 土木工学科, 教授 (00111261)
HACHIYA Yoshitaka MINISTRY OF LAND, INFRASTRUCTURE AND TRANSPORT, NATIONAL INSTITUTE FOR LAND AND INFRASTRUCTURE MANAGEMENT, 土質部・滑走路研究室, 室長
TAKEUCHI Yasushi TOKYO UNIVERSITY OF AGRICULTURE, DEPARTMENT OF REGIONAL AND ENVIRONMENTAL SCIENCE, ASSOCIATE PROFESSOR, 地域環境科学部・生産環境工学, 講師 (90271329)
野田 悦郎 日本道路株式会社, 技術研究所, 主任研究員
高橋 修 運輸省, 港湾技術研究所・土質部・滑走路研究室, 主任研究官
|Project Period (FY)
2000 – 2002
Completed (Fiscal Year 2002)
|Budget Amount *help
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2002: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2001: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 2000: ¥2,600,000 (Direct Cost: ¥2,600,000)
|Keywords||PAVEMENT / GRANULAR MATERIAL / BASE COUSE / CONSTITUTIVE LOW / THREE DIMENSIONAL FINITE ELEMENT METHOD / STRUCTURAL DESIGN / PHOTO ELASTIC TEST|
Granular material layers have not been considered to have high structural quality in pavement structures. The object of this project is to develop new analysis and evaluation methods of granular materials in pavement structure. For this purpose, the investigators have been divided into five groups and conducted their studies in collaboration among these groups. Outcomes of each group are as follows. Name(s) in parenthesis is(are) investigator(s) :
Group A. Modeling granular base course (Nishizawa) : A program package for structural analysis of pavement based on three dimensional finite element analysis, Pave3D was developed. Extended SMP Criterion Modified Cam-clay model, which was developed by Group B, was incorporated into the Pave3D. Using the model, effects of permanent deformation of granular subbase in a concrete pavement was investigated. It was found that the permanent deformation of base course significantly increases concrete stresses.
Group B. Modeling mechanical behavior of g
ranular material (Koyanagawa, and Takeuchi) : Existence of permanent deformation of base course under concrete slab was confirmed from a repetitive loading experiment. Then to apply the Extended SMP Criterion Modified Cam-clay model to granular materials, triaxial compression test was conducted on a granular base course material and parameters required for the model were identified.
Group C. Micro-mechanics of granular material (Murai) : Visualization of stress transfer path in granular material under compressive and shear tests was tried using the two dimensional photo-elastic test. From the results, effect of gradation on stress transfer path was investigated.
Group D. Improvement of construction of granular base course (Hachiya) : New base course material was developed using reclaimed asphalt concrete stabilized with cement. Also, effects of water content, compaction degree and thickness on construction were investigated. The results revealed that the effect of water content is very small if compaction is sufficient.
Group E. Structural evaluation of granular base course (Kamiura) : In order to precisely evaluate mechanical property of granular base course, applicability of compact FWD and PS layer inspection method were examined. It was found that both methods can be used for the evaluation and the difference between those two methods is very small. Less