综合管廊变形缝抗剪锚筋受力性能分析

Mechanical Property Analysis of Shear Resistance Anchoring Bars in Deformation Joint of Utility Tunnel

结合鄂州东站交通配套综合管廊项目,采用ANSYS有限元软件,结合MPC算法建立双舱管廊计算模型,研究静力荷载作用下抗剪锚筋布设方式、抗剪锚筋直径、结构受力状态对节点抗剪力学性能的影响。结果表明:管廊在承受由不均匀地层所产生的附加荷载时,主要由顶板处的抗剪锚筋承担;管廊的抗剪能力与抗剪锚筋的截面面积呈现非线性特性,截面面积的增加对抗剪能力的提升效果逐渐降低,需改变变形缝构造、抗剪锚筋布设方式及采取其他抗剪结构等措施,提高管廊的抗剪能力。

In relation to the transportation supporting project of utility tunnel for Ezhou East Station,with the calculation model of double-cabin utility tunnel established by means of MPC algorithm,ANSYS finite element software was used to study how the layout,the diameter and the structural stress state of shear resistance anchoring bars impact the mechanical property of the joints under the action of static load.The result shows that,when the utility tunnel withstands the additional load caused by inhomogeneous soil strata,the shear resistance anchoring bars at the roof play the main role.The shear-bearing capacity of the utility tunnel and the cross section of the shear resistance anchoring bars present nonlinear characteristics and,as the cross section increases,the impact on the improvement of shear-bearing capacity gradually decreases,the measures,such as changing the structure of deformation joint,changing the layout of shear resistance anchoring bars,or using other shear resistance structures,are required to improve the shear-bearing capacity of utility tunnel.