EXPERIMENTFAL STUDY ON THE ROLE OF SUPPORT IN THE MODERATE ROCK MASS

• NAKATA Masahiro

  JAPAN SOCIETY OF CIVIL ENGINEERS

• MITANI Koji

  JAPAN SOCIETY OF CIVIL ENGINEERS

• NAKAGAWA Koji

  JAPAN SOCIETY OF CIVIL ENGINEERS

Bibliographic Information

Other Title

• 比較的良好な地山での支保工の役割に関する実験的研究
• ヒカクテキ リョウコウ ナ ジヤマ デ ノ シホコウ ノ ヤクワリ ニ カンスル ジッケンテキ ケンキュウ

Abstract

We studied frequency distributions of horizontal convergences (the variation of length between two points on the sides) measured during construction of expressway tunnels The large part of these are small, less than 20mm and few supports are deformed. These facts suggest issues that vertical and horizontal convergences depend on the support effect or the properties of rock mass, and raise a question about what index we should use for support selection at site. Then we tried to reduce tunnel support in the moderate rock mess at 28 sites. We examined the difference in convergences and support stress in order to study the probability of reducing tunnel. support and the effect of it. Judging from this study, it is observed that convergences depend on the ground conditions and the role of support is not to control these displacements, but to prevent falling of rock blocks and loosening of rock mass.

Journal

• Doboku Gakkai Ronbunshu

  Doboku Gakkai Ronbunshu 1999 (623), 85-95, 1999-06-20

  Japan Society of Civil Engineers

Keywords

• NATM
• effect of support
• measurement
• convergence
• deformation
• standard tunnel support patterns

Details

• CRID: 1390001205308743424
• NII Article ID: 10002530391
• NII Book ID: AN10014020
• DOI: 10.2208/jscej.1999.623_85
• ISSN: 18827187
• ISSN: 02897806
• ISSN: http://id.crossref.org/issn/02897806
• NDL BIB ID: 4787441
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4787441
• Web Site: https://www.jstage.jst.go.jp/article/jscej1984/1999/623/1999_623_85/_pdf
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed