STUDY ON LINING BEHAVIOR OF CASTING SUPPORT TUNNELING SYSTEM USING TBM BY THREE DIMENSIONAL PHASE ANALYSIS

時系列三次元解析手法によるシールドを用いた場所打ち支保システムの一次覆工挙動の解明

Cast-in-place concrete lining system using TBM is called SENS. The characteristics of SENS is the construction method of the primary lining, that is, the cast-in-place concrete is placed at the space between inner form and ground; and the inner form ring is removed after the placed concrete is hardened. To clarify the lining behavior of SENS with the above mentioned unique construction process, a three-dimensional analysis model with phase analysis technique, which can take account of active earth pressure and construction process, was developed. The influence of ground and construction conditions on the displacement and sectional forces of lining were investigated by a parametric study on some properties, and the calculated results were compared with the site measured data. As a result, it was found that the proposed analysis method can represent the time dependent displacement and sectional forces of the lining of SENS reasonably. Furthermore, the influence of the ground and construction conditions on the lining behavior of SENS was made clear. シールドを用いた場所打ち支保システム(以下,SENSと呼ぶ)の一次覆工は,シールド工法とは異なり,内型枠と地山の間にコンクリートを打設し,その硬化後に内型枠を脱型することにより構築される.そこで,このような特殊な施工過程を有するSENSの一次覆工の挙動を解明するため,主働側の有効土圧と三次元で施工過程を考慮できる,SENSにおける時系列三次元解析手法を開発した.本解析手法を用いて,パラメータスタディを実施し,地盤条件および施工条件が一次覆工の変位と断面力に及ぼす影響について検討するとともに,得られた解析値を計測値と比較した.その結果,本解析手法でSENSの内型枠および一次覆工の時系列の変位と断面力を表現できること,地盤条件および施工条件が一次覆工の挙動に与える影響が明らかとなった.

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  • Accession Number: 01644725
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jul 20 2017 3:00PM