考虑环向接头影响的盾构管片受力特性试验研究  

Experimental study on the force characteristics of shield tube sheets considering the influence of annular joints

作　　者：周宇航 石钰锋[1,2] 钟广 时智广 刘浩晨 张涛 ZHOU Yuhang;SHI Yufeng;ZHONG Guang;SHI Zhiguang;LIU Haochen;ZHANG Tao(School of Civil Engineering and Construction,East China Jiaotong University,Nanchang 330013,China;Jiangxi Underground Space Technology Development Engineering Research Centre,Nanchang 330013,China;Nanchang Railway Transportation Group Co.,Ltd.,Nanchang 330199,China;Nanchang Orbital Housing and Bridge Building Materials Co.,Ltd.,Nanchang 330000,China;China Railway Second Institute East China Survey and Design Co.,Ltd.,Hangzhou 310004,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]江西省地下空间技术开发工程研究中心,江西南昌330013 [3]南昌轨道交通集团有限公司,江西南昌330199 [4]南昌轨道房桥建材有限公司,江西南昌330000 [5]中铁二院华东勘察设计有限责任公司,浙江杭州310004

出　　处：《铁道科学与工程学报》2022年第12期3758-3767,共10页Journal of Railway Science and Engineering

基　　金：南昌轨道交通集团有限公司科研项目(2020HGKYB009);国家自然科学基金资助项目(42177162)。

摘　　要：目前,国内外盾构隧道模型试验研究大多只将环向接头影响考虑为接头处的刚度折减,并未考虑管片在接头处的非连续性,然而相关研究表明,管片接头非连续性对盾构管片受力特性存在不可忽略的影响。为此提出一种“弹簧+螺栓型”接头模型,通过对该模型接头、原型管片接头、开槽型管片接头进行接头刚度折减、非连续性因素下的等效假设理论分析,开槽接头模型能准确代表接头刚度折减、设计接头模型能同时代表接头刚度折减以及接头非连续性的等效条件。在满足上述等效条件的情况下,分别对均质圆环隧道、开槽管片环隧道和设计管片环隧道进行覆土堆载试验,试验结果表明:接头刚度折减对管片结构收敛变形、截面弯矩极值及分布影响很大,但其对管片轴力影响很小;接头非连续性对管片结构收敛变形、截面弯矩极值有较大影响,但对管片截面弯矩分布和管片轴力影响较小。同时由试验数据分析可知,由于管片环向接头的存在使得弯矩分布重新调整,弯矩包络图呈现为“花生形”,且接头布置越密集调整得越厉害,这种情况使得部分管片区域及环向接头处弯矩降低,但管片最大弯矩值反而有所提高。Most of the experimental studies on shield tunnel models at home and abroad only consider the effect of the circumferential joint as a reduction in joint stiffness, without considering the discontinuity of the tube sheet at the joint. However, relevant studies have shown that the discontinuity of the tube sheet joint has a nonnegligible effect on the force characteristics of the shield tube sheet. A “spring + bolt” joint model was proposed,and the equivalent theoretical analysis of this model joint, the prototype joint and the slotted joint was carried out for the joint stiffness reduction and discontinuity factors. This resulted in a slotted joint model that accurately represents the joint stiffness reduction, and a design joint model that simultaneously represents the joint stiffness reduction and the equivalent assumption of joint discontinuity. The equivalence conditions for joint stiffness reduction and joint discontinuity were derived. Under the above equivalence conditions, overburden stacking tests were carried out on a homogeneous circular tunnel, a slotted tube sheet ring tunnel and a design tube sheet ring tunnel respectively. The discontinuity of the joint has a large influence on the convergence deformation and section moment extremes of the tube sheet structure, but has a small influence on the section moment distribution and the axial force of the tube sheet. Moreover, it can be seen from the analysis of the test data that due to the existence of the annular joints of the tube sheet, the bending moment distribution is readjusted and the bending moment envelope is “peanut-shaped”, and the denser the joint arrangement is, the more powerful the adjustment is, which makes part of the tube sheet area and the bending moment at the annular joints decrease, but the maximum bending moment value of the tube sheet increases.

关 键 词：盾构隧道 模型试验 环向接头 接头刚度 管片内力 等效假设 

分 类 号：U45[建筑科学—桥梁与隧道工程]