预制管廊在断层错动下响应分析

Response Analysis of Precast Utility Tunnels Under Fault Movement

本文研究断层错动下预制地下管廊的变形规律及损伤机理。采用混凝土塑性损伤本构模拟管廊,非线性弹簧单元模拟企口接头和预应力钢绞线,基于ABAQUS软件,建立穿越断层预制双舱管廊三维壳-弹簧模型,进行断层错动下管廊响应分析并提出抗震措施。研究表明,45°正断层错动下管廊顶板易发生拉压损伤,侧板易发生受压损伤;45°逆断层错动下管廊侧板易发生受压损伤。在90°断层错动下,管廊结构变形更集中在断层附近,侧板易发生拉压损伤。提高钢绞线截面积和替换断层附近土体是抵御断层的有效抗震措施。研究结果对于断层错动下地下管廊的抗震设计具有一定参考价值。

To study the deformation law and damage mechanism of precast underground utility tunnel under fault movement,the concrete plastic damage constitutive model is used to simulate the utility tunnel,the nonlinear spring element is used to simulate the tongue joint with water-stop rubber and prestressed strands,3D shellspring model of the precast utility tunnel crossing a fault is established by using software ABAQUS,and the response of the tunnel is performed and relevant seismic measures are proposed.The results show that the top slab of the utility tunnel under 45°normal fault movement is prone to tension and compression damage,and the side slab is prone to compression damage;the side slabs of the utility tunnel under 45°reverse fault movement are prone to compression damage.When the fault dip is 90°,the deformation of the structure is more concentrated near the fault,and the side slabs of the utility tunnel are prone to compression damage.Both increasing the cross-sectional area of steel strands and replacing the soil near the fault with soft soil are effective in resisting larger fault distances.The results may provide reference for the seismic design of precast utility tunnel under fault movement.