A SYSTEM OF SURVEY AND ANALYSIS FOR LARGE EXCAVATIONS IN JOINTED ROCK MASSES

节理岩体大型基坑勘察与分析系统

• 批准号: 62850090
• 负责人: ODA Masanobu
• 金额: $ 2.37万
• 依托单位: SAITAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62850090/
• 关键词: Numerical study; Survey; Rock mechanics; 調査・解析; 有限要素法; 不連続性岩盤

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.

实验证据有力地表明，由于断层和节理等地质不连续的存在，岩石的行为方式与固体基质(岩石本身)完全不同。引入了一个张量(称为裂隙张量)，作为反映地质不连续面地质特征的指标。利用裂隙张量，任何性质不连续的岩体都可以模型化为各向异性弹塑性多孔介质，并具有相应的弹性柔量、屈服函数、塑性势函数和渗透率张量。也就是说，根据裂隙张量定义了与不连续岩体的流体力学等价。利用这些本构方程，成功地进行了三种类型的数值分析：1)大型地下开挖的三维弹性分析；2)节理岩体的弹塑性分析；3)节理岩体的应力-流体耦合分析。

项目成果

Masanobu Oda: "Permeability of rock masses at great depth." Proc. of Int. Conf. on Rock at Great Depth. 449-455 (1989)

Masanobu Oda：“大深度岩体的渗透性。”

山辺正 小田匡寛: "Continuum Modelling of Rock Joints and Its Application to Three Dimensional Excavation Analysis" 印刷中.

Tadashi Yamabe 和 Masahiro Oda：“岩石节理的连续体建模及其在三维开挖分析中的应用”已出版。

小田匡寛: "A Method for Evaluating the Representative Elementary Volume Based on Joint Sunney of Rock Masses" Canadian Geotechnical Journal. 26. 440-447 (1989)

Masahiro Oda：“基于岩体联合阳光的代表性基本体积评估方法”加拿大岩土工程杂志 26. 440-447 (1989)。

M.Oda: Canadian Geotechnical Journal. 25. 440-447 (1988)

M.Oda：加拿大岩土工程杂志。

小田匡寛,他2名: "Numerical Experiments on Permeability Tensor and Its Application to Jointed Granite at Stripa Mine,Swedex" Journal of Geophysical Research. 92. 8037-8048 (1987)

Masahiro Oda 等 2 人：“渗透率张量数值实验及其在 Stripa 矿节理花岗岩中的应用，瑞典”地球物理研究杂志 92. 8037-8048 (1987)。