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预制拼装综合管廊承插式接头扭转力学性能

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为研究节段预制拼装综合管廊承插式接头扭转力学性能，利用ABAQUS有限元软件建立预制拼装管廊节段与土体纵向三维模型，对管廊正向扭转与反向扭转进行模拟，分析管廊扭转承插式接头应力分布规律，得到管廊承插式接头扭矩随横向差异沉降变化规律及管廊横向极限差异沉降量。研究结果表明:管廊节段正向扭转与反向扭转沉降量相同时，承插式接头应力、最大主应力与切应力分布规律基本相同。管廊扭转接头插口端侧壁应力较大，接头顶底板中间与腋角处应力较小，接头最大主应力集中在承口端侧壁距顶板外侧1 m处与插口端顶底板，接头切应力在顶底板中间与侧壁中间最小，向两侧逐渐增大至腋角处切应力最大。管廊承插式接头横向极限差异沉降为1。2 mm，管廊插口端极限扭矩与采用箱型截面计算的结果相差不大，工程实际中可采用箱型截面对管廊插口端抗扭设计。研究结果为预制拼装管廊安全运营提供科学依据。
Torsional mechanical properties of precast utility tunnel bell and spigot joint
To research the torsional mechanical properties of precast utility tunnel bell and spigot joint,the three-dimensional model of soil and utility tunnel was established by ABAQUS software,the stress distribu-tion of utility tunnel segment torsional deformation bell and spigot joint was analyzed,and the transverse ultimate differential settlement of bell and spigot joint and ultimate differential settlement were obtained.The results show that when the utility tunnel forward and reverse torsional settlement is the same,the bell and spigot joint of stress,maximum principal stress and shear stress distribution law is basically the same.The stress on the bell end wall is large but is small in the middle of the joint top and bottom plate and the axillary corner.The maximum principal stress is concentrated on the bell end side wall and the spigot top and bottom plate.The maximum principal stress at 1 m from top plate the side wall of the bell end to the outside is the largest.The joint shear stress is the smallest in the middle of the top and bottom plate and side wall,gradually increases to sides,and reaches the maximum shear stress at axillary corner.The bell and spigot joint transverse limit differential settlement is 1.2 mm,and there is little difference between the ultimate torque and the results calculated by using box section at the spigot joint;in engineering practice,the box section can be used for the spigot joint torsional design.The research results provide a scientific basis for the precast utility tunnel safe operation.

precast utility tunnelbell and spigot jointtorsional deformationmechanical property of jointultimate settlement

凌同华、余彬、黄阜、肖南

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长沙理工大学岩土与隧道工程系,410076长沙

长沙理工大学桥梁工程湖南省高校重点实验室,410076长沙

预制拼装综合管廊 承插式接头 扭转变形 接头力学性能 极限沉降

国家自然科学基金资助项目国家自然科学基金资助项目湖南省自然科学基金资助项目湖南省研究生科研创新项目桥梁工程湖南省高校重点实验室开放基金

52078061518780742021JJ30714CX2018B53118KA03

2024

10.11776/j.issn.1000-4939.2024.04.010

应用力学学报
西安交通大学

应用力学学报

CSTPCD北大核心
影响因子：0.398
ISSN：1000-4939
年,卷(期)：2024.41(4)