铁道科学与工程学报2025，Vol.22Issue(10)：4610-4622,13.DOI:10.19713/j.cnki.43-1423/u.T20250107
内张钢圈加固盾构隧道管片接头破坏机制的精细模拟研究
Refined numerical simulation study on the failure mechanisms of segmental joints in shield tunnels reinforced by epoxy-bonded steel plates
摘要
Abstract
The mechanical behavior of longitudinal joints is a critical factor influencing the load-bearing capacity and durability of shield tunnel linings reinforced with internal prestressed steel rings.To deeply investigate the failure process and mechanical mechanism of reinforced segmental joints,a refined three-dimensional nonlinear finite element model of segmental joints reinforced with internal prestressed steel rings was established and validated through prototype joint tests.The load-transfer process and mechanical behavior of each joint component were analyzed systematically,and the mechanical mechanisms were summarized.Subsequently,parametric analyses were performed to clarify the effects of the epoxy adhesive interface,chemical anchors,and steel plate parameters on the macroscopic mechanical indices of segmental joints.The results indicate that the failure process of reinforced segmental joints consists of three stages:coordinated force-bearing,internal force redistribution,and ultimate failure.Steel plates are the primary load-bearing components before interface damage;after interface failure,internal forces rapidly decrease to residual values,which positively correlate with steel plate dimensions.The recommended thickness for steel plates ranges from 20 to 40 mm,and the width should approach the segmental ring width as closely as practically feasible.The epoxy adhesive interface undergoes tensile-shear composite failure under positive bending moments and compressive-shear composite failure under negative bending moments.The vulnerable locations are circumferentially near the joints and longitudinally near the steel plate ends.It is recommended that the epoxy adhesive interfaces possess a tensile strength greater than 1.5 MPa and a shear strength greater than 2 MPa.Chemical anchors provide anchorage after interface damage and separation,ultimately experiencing shear failure.The number of chemical anchors within a circumferential range of 20° near joints subjected to positive bending moments is recommended to be fewer than 12,while fewer than 16 anchors are advised under negative bending moments.The findings provide guidance for optimizing the design of shield tunnel linings reinforced with internal prestressed steel rings.关键词
盾构隧道/内张钢圈加固/管片接头/受力机理/数值模拟Key words
shield tunnel/epoxy-bonded steel plate reinforcement/segmental joints/force mechanism/numerical simulation分类
土木建筑引用本文复制引用
洪剑宇,甘海杰,柳献..内张钢圈加固盾构隧道管片接头破坏机制的精细模拟研究[J].铁道科学与工程学报,2025,22(10):4610-4622,13.基金项目
国家自然科学基金资助项目(52478409) （52478409）
