Establishment of fracture mechanics based design method for SFRC tunnel lining

基于断裂力学的钢纤维混凝土隧道衬砌设计方法的建立

• 批准号: 06555131
• 负责人: HORII Hideyuki
• 金额: $ 4.48万
• 依托单位: UNIVERSITY OF TOKYO
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555131/
• 关键词: Fracture mechanics; Tunnelling method; Extruded Concrete Lining Method; Design method; Cracking; Steel fiber reinforced method; Displacement field measurement; 掘削覆工併進工法; 高繊維補強コンクリート; 鋼繊維補強コンクリート

The validity of the developed analysis method for crack growth in concrete is clarified by comparing numerical results with experimental data. The main concern is to check weather the localization of distributed cracks into one major crack can be reproduced or not.Uniaxial tension tests and bending tests of steel fiber reinforced concrete are conducted. The surface displacements are measured with laser speckle method, and the distribution of cracks and crack opening displacements are obtained.The transmitted stress across the crack surface is estimated through the measured crack opening displacement and tension-softening curve.The tension-softening curves obtained from uniaxial tension tests and bending tests with back analysis method are in agreement.This implies that the tension-softening curve is a material property which does not depend on the testing method.The obtained tension-softening curve is used in FEM analysis in discussions for the design method.A design method of tunnel lining with SFRC (steel fiber reinforced concrete) is proposed. The cross-sectional capacity is estimated based on fracture mechanics of concrete. To show the validity of the design method. the estimated cross-sectional capacity is compared with the existing experimental results.

通过数值计算结果与实验数据的比较，阐明了所提出的混凝土裂纹扩展分析方法的有效性。为了验证钢纤维混凝土中分布裂缝的局部化是否可以再现，进行了钢纤维混凝土的单轴拉伸和弯曲试验。用激光散斑法测量表面位移，用反分析方法得到的拉伸软化曲线与单轴拉伸试验得到的拉伸软化曲线吻合较好，说明拉伸软化曲线与单轴弯曲试验得到的拉伸软化曲线吻合较好，说明拉伸软化曲线与单轴弯曲试验得到的拉伸软化曲线吻合较好，说明拉伸软化曲线与单轴弯曲试验得到的拉伸软化曲线吻合较好。软化曲线是一种不依赖于试验方法的材料特性，将得到的拉伸-软化曲线用于有限元分析，探讨了钢纤维混凝土隧道衬砌的设计方法，提出了钢纤维混凝土隧道衬砌的设计方法。基于混凝土断裂力学理论，对混凝土截面承载力进行了估算。验证了设计方法的有效性。估算的截面容量与现有的实验结果进行了比较。

项目成果

H.Yoshida, H.Horii and H.Uno: ""micromechancis-based continuum theory for jointed rock mass and analysis of large-scale cavern excavation"" Proceedings of Eighth International Congress on Rock Mechanics.Tokyo.Japan.1995.A.A.Balkema.Vol.2. 689-692 (1995)

H.Yoshida、H.Horii 和 H.Uno：“基于微观力学的节理岩体连续体理论和大型洞穴开挖分析”第八届国际岩石力学大会论文集。日本东京。1995.A.A.Balkema

H.Horii and Y.Okui: "Micromechanics-based continuum theory and numerical analysis of localization phenomena" Computer Methods and Advances in Geomechanics, Siriwardane & Zaman(eds).Proceedings of the eighth International Conference on Computer Methods and

H.Horii 和 Y.Okui：“基于微力学的连续介质理论和定位现象的数值分析”地质力学的计算机方法和进展，Siriwardane

H.Horii, P.Nanakorn and P.Kabele: "Application of Fracture Mechanics to Design of SFRC Tunnel Linings and Development of Strain hardening Comentitious Composites" Frocture Mechanics of Concrete Structures,Proceedings FRAMCOS-2,edited by H.Wittmann,AEDIFIC

H.Horii、P.Nanakorn 和 P.Kabele：“断裂力学在 SFRC 隧道衬砌设计中的应用和应变硬化 Comentitious 复合材料的开发”混凝土结构断裂力学，论文集 FRAMCOS-2，H.Wittmann 编辑，AEDIFIC

H. Yoshida, H. Horii and H. Uno: "Micromechanics-based Continuum Theory for Jointed Rock Mass and Analysis of Large-scale cavarn excavation" Proceedings of Eighth International Congress on Rock Mechanics, Tokyo, Japan, 1995, A. A. Balkema. Vol. 2. 689-692

H. Yoshida、H. Horii 和 H. Uno：“基于微观力学的节理岩体连续体理论和大型洞穴开挖分析”第八届国际岩石力学大会论文集，日本东京，1995 年，A. A. Balkema。

井上純哉.堀井秀之.: "熱力学的定式化に基づく変形の局所化の理論と解析手法" 構造工学論文集. 41A. (1995)

Junya Inoue. Hideyuki Horii.：“基于热力学公式的变形局部化理论和分析方法”《结构工程学报》41A。