1989 Fiscal Year Final Research Report Summary
A SYSTEM OF SURVEY AND ANALYSIS FOR LARGE EXCAVATIONS IN JOINTED ROCK MASSES
| Project/Area Number |
62850090
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
基礎・土質工学
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| Research Institution | SAITAMA UNIVERSITY |
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Principal Investigator |
ODA Masanobu SAITAMA UNIVERSITY, FOUNDATION ENG., PROF., 工学部, 教授 (90008855)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAGAMI Saiichi KISOJIBAN CONSULT., DESIGN SECT., CHIEF ENG., 技術部, 主任
OOSAKA Hajime TAISEI CORP., DESIGN SECT., CHIEF ENG., 技術本部, 係長
KAMEMURA Katsumi TAISEI CORP., DESIGN SECT., CHIEF ENG., 技術本部, 設計長
KAWAKAMI Eiji SAITAMA UNIVERSITY, CONSTRACTION ENG., ASSO. PROF., 工学部, 助教授 (50125887)
YAMABE Tadashi SAITAMA UNIVERSITY, FOUNDATION ENG., ASSO. PROF., 工学部, 助教授 (40125894)
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| Project Period (FY) |
1987 – 1989
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| Keywords | Numerical study / Survey / Rock mechanics |
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| Research Abstract |
Experimental evidences strongly suggested that rock masses behave in a completely different manner from the solid matrix (rock itself) due to the presence of geological discontinuities such as faults an joints. A tensor (called the crack tensor) is introduced so as to be an index showing the geological characteristics of the geological discontinuities. Using crack tensor, any rock mass, which is discontinuous in nature, can be modeled as an anisotropic, elasto-plastic porous medium with the corresponding elastic compliance, yield function, plastic potential function and permeability tensor. That is, a hydro- mechanically equivalent to the discontinuous rock mass is defined in terms of the crack tensor. Using these constitutive equations, three types of numerical analyses were performed with great success; i.e., 1) three-dimensional elastic analyses for large underground excavations, 2) elastic-plastic analyses for jointed rock masses and 3) coupled stress and fluid flow analyses for jointed rock masses.
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