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2002 Fiscal Year Final Research Report Summary

QUANTITATIVE EVALUATION OF THE BEARING CAPACITY OF SURROUNDING ROCK MASS AND THEORETICAL CONSTRUCTION OF THE CHARAVTERISTIC CURVE OF TUNNEL SUPPORT FOR NATM

Research Project

Project/Area Number 13650542
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionTOTTORI UNIVERSITY

Principal Investigator

KIYAMA Hideo  TOTTORI UNIVERSITY, FACULTY OF ENGINEERING, PROFESSOR, 工学部, 教授 (30026067)

Co-Investigator(Kenkyū-buntansha) NISHIMURA Tsuyoshi  TOTTORI UNIVERSITY, FACULTY OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (90189308)
FUJIMURA Hisashi  TOTTORI UNIVERSITY, FACULTY OF ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (30032030)
Project Period (FY) 2001 – 2002
KeywordsNATM / GROUND RESPONSE CURVE / ELASTIC THEORY / COMPETENT FACTOR / DEM
Research Abstract

Active mobilization of bearing capacity of rock mass surrounding an underground opening characterizes the NATM (New Austrian Tunneling Method) concept of supporting. There have been many attempts to give quantitative expressions for this capacity but no one has ever completely solved the question. In the first part of this paper theoretical relations between support pressure and tunnel wall displacements are briefly discussed. We derive a simplified solution of a circular lined-tunnel in an elastic ground under the plain strain for full-slip and no-slip conditions. These two conditions at the ground-lining interface make it possible to explain the effects of shear stress transmission and relative shear displacement. The lateral free-field ground stresses for this solution are restricted to a fixed value of the vertical stresses (σ_v* = -p, σ_H* = -kp). An actual tunnel opening is excavated and supported after the load corresponding to the free-field stresses. We introduce an assumption … More of the actual "excavation unloading" conditions that occur during tunneling. By advancing this derivation, the strict solution is utilized successfully to construct a theoretical characteristic curve of tunneling. The characteristic curve shows clearly the bearing capacities of a tunnel lining, the surrounding ground and the total by using an index "relative-support-stiffness".
The elastic theory of the stress distribution around tunnels demonstrates that the deviatoric stresses are maximum at the periphery of the excavation. Discussion here should include the dependence of the characteristic curve on the zone of yielded ground and the discontinuity in the ground. We have carried out numerical simulations for a discontinuous ground with Distinct Element Modeling. The realistic ground reaction curves by the analyses are examined with the theoretical solution derived above. We will learn that while the ground may work, more or less, as a load bearing structural component to the load corresponding to the free-field stresses, overestimation must be avoided. Less

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 木山英郎: "NATMのための地山支保力の定量化と支保特性曲線の構成-Fenner-Pacher曲線の極小点は周辺地山の破壊点なのでは?-"地盤と建設. 第19巻. 1-8 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 福田 毅, 木山 英郎, 西村 強, 風間 広志: "運動方程式の時間差分を利用した群杭井筒基礎の3次元数値解析法"地盤工学シンポジウム講演論文集. 第47巻. 263-270 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 谷口 洋二, 西村 強, 精山 誉志, 木山 英郎: "鳥取県西部地震で発生した落石と3次元個別要素解析例"岩盤力学に関するシンポジウム講演論文集. 第32巻. 401-406 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Nishimura, H.Kiyama, P.Egger, M.Hasegawa: "Numerical simulation for the stability of a stacked-drift-type tunnel"Proceedings of the 1^<st> UE Kyoto -Role of Geo-technology to the Underground Environment -. 第1巻. 269-274 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西村 強, 木山英郎: "2次元弾性解と個別要素解析によるトンネル支保特性曲線の考察"材料. 第52巻第5号(掲載決定). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KIYAMA Hideo: "Quantitative Evaluation of the Bearing Capacity of Surrounding Rock Mass and Theoretical Construction of the Characteristic Curve of Tunnel-support for NATM"Grounding Engineering. Vol.19, No.1. 1-8 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] FUKUDA Tsuyoshi, KIYAMA Hideo, NISHIMURA Tsuyoshi, KAZAMA Hiroshi: "3-D Numerical Modeling of the Stability of a Sheet-Pile Foundation using the Explicit-Finite Difference Scheme"Proceedings of the 47th Symposium of Geotechnical Engineering. Vol.47. 263-270 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TANIGUCHI Youji, MISHIMURA Tsuyoshi, KIYAMA Hideo, SEIYAMA Takashi: "Three-Dimensional Numerical Simulation for Rockfalls - Application to a Rockfall due to the Western Tottori Earthquake 2000 -"Proceedings of the 32nd Symposium of Rock Mechanics. Vol.32. 401-406 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] NISHIMURA Tsuyoshi, KIYAMA Hideo, EGGER Peter, HASEGAWA Makoto: "Numerical Simulation for the Stability of a Stacked-Drift-Type Tunnel"Proceedings of the 1st UE Kyoto - Role of Geo-technology to the Underground Environment -. Vol.1. 269-274 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] NISHIMURA Tsuyoshi, KIYAMA Hideo: "Two-Dimensional Elastic Analysis and Distinct Element Modeling for Characteristic Curves of Tunneling"Journal of the Society of Material Science, Japan (to be appeared). Vol.52, No.5. (2003)

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      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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