钢纤维喷射混凝土结构安全性分析方法  

Safety Analysis Method for Steel Fiber Sprayed Concrete Structures

作　　者：王文正 王明年[1,2] 刘大刚[1,2] 王志龙 罗佳[3,4] Wang Wenzheng;Wang Mingnian;Liu Dagang;Wang Zhilong;Luo Jia(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,P.R.China;Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,P.R.China;Sichuan University Jinjiang College,Meishan,Sichuan 620860,P.R.China;Network and Data Security Key Laboratory of Sichuan Province,University of Electronic Science and Technology of China,Chengdu 610054,P.R.China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学交通隧道工程教育部重点实验室,成都610031 [3]四川大学锦江学院计算机学院,四川眉山620860 [4]网络与数据安全四川省重点实验室(电子科技大学),成都610054

出　　处：《地下空间与工程学报》2024年第5期1676-1685,共10页Chinese Journal of Underground Space and Engineering

基　　金：铁路总公司系统性重大项目(P2018G048);成都市科技项目(2022-XT00-00002-GX);网络与数据安全四川省重点实验室开放课题资助(NDS2022-2)。

摘　　要：钢纤维喷射混凝土作为隧道喷射混凝土支护的新型材料,具有更优的抗拉、抗裂性能和耐久性,为了研究其用于隧道支护对承载力的影响以及开裂情况,建立了钢纤维喷射混凝土结构安全性分析方法。该分析方法根据钢纤维喷射混凝土构件尺寸,检测在荷载作用下钢纤维喷射混凝土构件是否发生开裂,若未开裂则构件尺寸合理,若开裂则需计算出实际裂缝宽度判别是否满足安全规范要求。根据分析流程对Ⅲ级围岩钢纤维喷射混凝土Ⅰ型和Ⅱ型、Ⅳ级围岩钢纤维喷射混凝土三种支护类型进行工程验证,结果表明:同一级围岩,钢纤维喷射混凝土越厚,越不易开裂,安全性越高;不同级围岩,围岩荷载越大,同一厚度的钢纤维喷射混凝土越易开裂且开裂后裂缝宽度越大;理论计算结果与现场试验结果基本吻合,验证了钢纤维喷射混凝土结构安全性分析方法的实用性和有效性。As a new type of material for tunnel shotcrete support,steel fiber shotcrete has better tensile,crack resistance,and durability.To study its impact on bearing capacity and cracking when used for tunnel support,a safety analysis method for steel fiber shotcrete structures was established.This analysis method detects whether the steel fiber sprayed concrete component cracks under load based on the size of the steel fiber sprayed concrete component.If it does not crack,the component size is reasonable;If cracking occurs,it is necessary to calculate the actual crack width to determine whether it meets the requirements of safety regulations.According to the analysis process,engineering verification was conducted on three types of support types of steel fiber shotcrete for Class III surrounding rock,namely Type I,Type II,and Class IV surrounding rock.The results showed that the thicker the steel fiber shotcrete for the same level of surrounding rock,the less likely it is to crack,and the higher its safety.The greater the load on different levels of the surrounding rock,the easier it is for steel fiber sprayed concrete of the same thickness to crack and the wider the crack width after cracking.At the same time,the theoretical calculation results are basically consistent with the on-site test results,verifying the practicality and effectiveness of the safety analysis method for steel fiber-sprayed concrete structures.

关 键 词：钢纤维喷射混凝土 开裂 拉应力 裂缝高度 裂缝宽度 

分 类 号：U455.1[建筑科学—桥梁与隧道工程]