A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
DESIGN METHOD ACCORDING TO SEQUENTIAL EXCAVATION ANALYSIS OF MOUNTAIN TUNNEL
To provide a design method according to sequential excavation analysis of a mountain tunnel that reflects a real phenomenon in which sprayed concrete receives a load in a variable load state and receives gradual displacement accompanying tunnel excavation, considers creep and dry shrinkage deformation at extremely early ages, and has high analysis accuracy without applying an equivalent modulus of elasticity.SOLUTION: A design method according to sequential excavation analysis of a mountain tunnel includes: a step A of conducting a multi-stage stress relaxation test of loading gradually-changing displacement on a specimen for every elapsed time according to the material age of the specimen to specify the stress-time relationship of the specimen; a step B of executing reproduction analysis of reproducing the stress-time relationship to specify dynamic characteristics according to the material age of the specimen; and a step C of executing sequential excavation analysis of a tunnel by using sprayed concrete model having dynamic characteristics according to the material age and an analysis model including a ground model around the sprayed concrete model.SELECTED DRAWING: Figure 1
【課題】吹付けコンクリートが変位載荷的に荷重を受け、さらにはトンネル掘削に伴う段階的な変位を受けるといった実現象が反映され、極若材齢のクリープと乾燥収縮変形が考慮されるとともに、等価弾性係数を適用することなく、高い解析精度を有する、山岳トンネルの逐次掘削解析による設計方法を提供する。【解決手段】山岳トンネルの逐次掘削解析による設計方法であり、供試体に対してその材齢に応じた経過時間ごとに段階的に変化する変位を載荷する多段階応力緩和試験を行い、供試体の応力－時間関係を特定するＡ工程、応力－時間関係を再現する再現解析を実施し、供試体の材齢に応じた力学特性を特定するＢ工程、材齢に応じた力学特性を有する吹付けコンクリートモデルと、その周辺の地盤モデルを含む解析モデルを用いて、トンネルの逐次掘削解析を実施するＣ工程を有する。【選択図】図１
DESIGN METHOD ACCORDING TO SEQUENTIAL EXCAVATION ANALYSIS OF MOUNTAIN TUNNEL
To provide a design method according to sequential excavation analysis of a mountain tunnel that reflects a real phenomenon in which sprayed concrete receives a load in a variable load state and receives gradual displacement accompanying tunnel excavation, considers creep and dry shrinkage deformation at extremely early ages, and has high analysis accuracy without applying an equivalent modulus of elasticity.SOLUTION: A design method according to sequential excavation analysis of a mountain tunnel includes: a step A of conducting a multi-stage stress relaxation test of loading gradually-changing displacement on a specimen for every elapsed time according to the material age of the specimen to specify the stress-time relationship of the specimen; a step B of executing reproduction analysis of reproducing the stress-time relationship to specify dynamic characteristics according to the material age of the specimen; and a step C of executing sequential excavation analysis of a tunnel by using sprayed concrete model having dynamic characteristics according to the material age and an analysis model including a ground model around the sprayed concrete model.SELECTED DRAWING: Figure 1
【課題】吹付けコンクリートが変位載荷的に荷重を受け、さらにはトンネル掘削に伴う段階的な変位を受けるといった実現象が反映され、極若材齢のクリープと乾燥収縮変形が考慮されるとともに、等価弾性係数を適用することなく、高い解析精度を有する、山岳トンネルの逐次掘削解析による設計方法を提供する。【解決手段】山岳トンネルの逐次掘削解析による設計方法であり、供試体に対してその材齢に応じた経過時間ごとに段階的に変化する変位を載荷する多段階応力緩和試験を行い、供試体の応力－時間関係を特定するＡ工程、応力－時間関係を再現する再現解析を実施し、供試体の材齢に応じた力学特性を特定するＢ工程、材齢に応じた力学特性を有する吹付けコンクリートモデルと、その周辺の地盤モデルを含む解析モデルを用いて、トンネルの逐次掘削解析を実施するＣ工程を有する。【選択図】図１
DESIGN METHOD ACCORDING TO SEQUENTIAL EXCAVATION ANALYSIS OF MOUNTAIN TUNNEL
山岳トンネルの逐次掘削解析による設計方法
OSADA SHOHEI (author) / OTSUKA ISAMU (author)
2023-12-14
Patent
Electronic Resource
Japanese
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