引用本文摘 ? 要：為了解荷載對盾構隧道管片的影響，基于混凝土塑性損傷本構模型，考慮內置鋼筋、連接螺栓與管片間的非連續性接觸，進行了荷載作用下管片受力破壞全過程的有限元模擬分析，研究了管片混凝土、連接螺栓與內置鋼筋的力學性能變化，并探討了土體抗力系數對管片受力與變形的影響。結果表明：在荷載作用下，管片封頂塊與標準塊接頭內側張開外側壓緊，鄰接塊接頭外側張開內側壓緊，管片初始破壞位置處于拱底處內側，以縱向裂縫為主，最終形成網狀裂縫；管片受力與變形受土體抗力系數影響顯著，其橢圓度、接頭張開量、螺栓、鋼筋應力隨土體抗力系數的增大而減小。 Abstract： In order to study the influence of load on the existing shield tunnels, the plastic-damage model was adopted to represent the nonlinear characteristics between concrete, built-in steel bars and connectinh bolt. The finite element analysis of the whole failure process under the surface surcharge was carried out, the stress changes of segment concrete, connecting bolts and built-in steel bars were studied, and the influence of soil resistance coefficient on the force and deformation of segment structure was discussed. The results show that the joint between the key block and the standard block is expanded and compressed on the outside, the location of the initial failure of the segment is at the inner surface at the bottom of the haunch, mainly longitudinal cracks, and finally form network cracks. The force and deformation of shield tunnel structure are significantly affected by the soil resistance coefficient. The ellipticity, joint expansion, bolt and steel stress of shield tunnel structure decrease with the increase of soil resistance coefficient.
覃智澤,韋向高,許顯龍.荷載對盾構隧道管片力學性能影響的模擬分析[J].混凝土與水泥制品,2021(11):51-54. QIN Z Z,WEI X G,XU X L.Simulation Analysis of Influence of Load on the Mechanical Properties of Concrete Shield Segment[J].China Concrete and Cement Products,2021(11):51-54.