Mechanical behavior of segment rebar of shield tunnel in construction stage

Abstract：In this paper, a 3D finite element (FE) program ADINA was applied to analyzing a tunnel with 9 segment rings. The loads acting on these segment rings included the squeezing action of tail brush of shield machine under attitude deflection, the jacking forces, the grouting pressure and the soil pressure. The analyses focused on the rebar stress in two statuses: (1) normal construction status without shield machine squeezing; (2) squeezing action induced by shield machine under attitude deflection.The analyses indicated that the rebar stress was evidently affected by the construction loads. In different construction status, the rebar stress ranges from -80 MPa to 50 MPa, and the rebar is in elastic status. Even some cracks appear on segments, the stress of segment rebar is still at a low level. It is helpful to incorporate a certain quantity of steel fiber to improve the anti-crack and shock resistance performance. 作者： Author： Jun-sheng CHEN[1]  Hai-hong MO[2] 作者單位： Department of Civil Engineering, South China University of Technology, Guangzhou 510640, ChinaState Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China 期 刊： 浙大學(xué)報（英文版）（A輯：應(yīng)用物理和工程）   ISTICEISCI Journal： JOURNAL OF ZHEJIANG UNIVERSITY SCIENCE A 年，卷(期)： 2008, 9(7) 分類號： U455 Keywords： Shield tunnel    Construction    Segment    Rebar    Finite element (FE) analysis    機標分類號： TQ3 TB3 機標關(guān)鍵詞： shock resistance    finite element    steel fiber 基金項目： Guangzhou Metro of China

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