钢筋钢纤维混凝土盾构管片裂缝宽度计算方法  

Crack Width Calculation Method of Reinforced Steel Fiber Concrete Shield Segment

作　　者：周佳媚[1] 薛志斌 马敏 岳飞翔 崔凯琪 Zhou Jiamei;Xue Zhibin;Ma Min;Yue Feixiang;Cui Kaiqi(State Key Laboratory of Intelligent Geotechnics and Tunnelling,Southwest Jiaotong University,Chengdu 610031,P.R China;Shenzhen Railway Investment and Construction Group Co.,Ltd.,Shenzhen,Guangdong 518026,P.R China)

机构地区：[1]西南交通大学极端环境岩土和隧道工程智能建养全国重点实验室,成都610031 [2]深圳铁路投资建设集团有限公司,广东深圳518026

出　　处：《地下空间与工程学报》2025年第1期180-188,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51078319)。

摘　　要：预制混凝土管片是目前地铁盾构隧道最常用的衬砌结构形式,为了更好地发挥钢筋钢纤维混凝土盾构管片的优点,得到准确的钢筋钢纤维混凝土盾构管片裂缝宽度计算方法,设计4组18根钢纤维混凝土梁试验方案,开展了试验数据与有限元软件ABAQUS计算分析。(1)通过压弯梁和纯弯梁构件试验得到数据,提出钢筋钢纤维混凝土纯弯及大偏心受压构件裂缝宽度计算方法;(2)通过有限元分析钢纤维掺量及配筋率变化对裂缝宽度的影响,钢纤维掺量增大时,钢纤维混凝土抗拉强度逐渐增加,构件裂缝宽度逐渐减小,配筋率增大时,钢筋达到屈服强度时对应的荷载也逐渐增加,裂缝宽度逐渐减小;(3)通过管片裂缝宽度实测试验,本文提出公式与《Model Code》计算得到的裂缝宽度与管片试验结果相对接近,平均值相差分别为56%、50%;(4)提出的裂缝宽度计算方法有效考虑钢纤维掺量、配筋率对裂缝宽度的影响,计算结果更为准确,可以有效评价C50钢筋钢纤维混凝土盾构管片裂缝宽度计算。Precast concrete segment is the most commonly used lining structure form of subway shield tunnel.In order to give full play to the advantages of reinforced steel fiber concrete shield segments and obtain an accurate calculation method of crack width,four groups of 18 steel fiber reinforced concrete beam test schemes were designed.Based on the experimental data and the finite element analysis of ABAQUS,the research results show that:(1)Based on the data obtained from the test of bending beam and pure bending beam,the calculation method of crack width of reinforced steel fiber reinforced concrete pure bending and large eccentric compression members is proposed.(2)The influence of steel fiber content and reinforcement ratio on crack width is analyzed by finite element analysis.When the steel fiber content increases,the tensile strength of steel fiber reinforced concrete increases gradually,and the crack width of the component decreases gradually.When the reinforcement ratio increases,the corresponding load when the steel bar reaches the yield strength increases gradually,and the crack width decreases gradually.(3)Through the measured test of shield segment crack width,the crack width calculated by the formula and the Model Code is relatively close to the segment test results,and the average difference is 56%and 50%respectively.(4)The proposed crack width calculation method effectively considers the influence of steel fiber content and reinforcement ratio on crack width.The calculation results are more accurate and can effectively evaluate the crack width calculation of C50 steel fiber reinforced concrete shield segment.

关 键 词：钢纤维混凝土 盾构管片 裂缝宽度 钢纤维掺量 配筋率 

分 类 号：U459[建筑科学—桥梁与隧道工程]