摘要
为探究喷射混凝土围岩复合体受压力学特性,结合三维数字图像相关技术,针对4种不同喷射混凝土围岩复合体试件开展了单轴受压试验,探究了纤维和岩石种类对复合体破坏模式和受压性能的影响.基于Weibull统计损伤理论,构建了适用于复合体的受压应力应变本构模型.试验结果表明,不同围岩基复合体破坏模式存在显著差异,但微裂缝均先从喷射混凝土中发展.破坏时,围岩部分表现单一裂纹模式,而喷射混凝土部分呈现多裂纹扩展状态.4种复合体峰值强度均高于单一喷射混凝土破坏强度,且砂岩基复合体的峰值强度均高于花岗岩基复合体,平均高出5.55%.同种围岩条件下,纤维增强喷射混凝土复合体强度会存在轻微降低,较普通喷射混凝土复合体平均下降1.95%.此外,所建本构模型计算结果与试验数据吻合较好.
To investigate the compressive mechanical properties of shotcrete-surrounding rock composite,uniaxial compression tests were conducted on four different shotcrete-surrounding rock composite specimens using three-dimensional digital image correlation technology.The effects of fiber and rock type on the failure mode and compressive performance of the composites were explored.Based on Weibull statistical damage theory,a constitutive model of compressive stress-strain suitable for composites was constructed.The test results show that the failure modes of the composites with different surrounding rock bases are significantly different,but microcracks all develop first from the shotcrete.At failure,the surrounding rock part exhibits a single crack mode,while the shotcrete part shows a multi-crack expansion state.The peak strengths of the four composites are higher than the failure strength of single shotcrete,and the peak strengths of sandstone-based composites are higher than those of granite-based composites,with an average increase of 5.55%.Under the same surrounding rock conditions,the strengths of composites with fiber-reinforced shotcrete are slightly reduced,with an average decrease of 1.95%compared with composites with ordinary shotcrete.In addition,the model calculation results are in good agreement with the test data.
作者
石丹丹
陈徐东
陆锴龙
刘振威
Shi Dandan;Chen Xudong;Lu Kailong;Liu Zhenwei(College of Civil and Transportation Engineering,Hohai University,Nanjing 210024,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第5期1161-1169,共9页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(52379124).
关键词
喷射混凝土
围岩
三维数字图像相关(3D-DIC)
裂缝扩展
本构模型
shotcrete
surrounding rock
three-dimensional digital image correlation(3D-DIC)
crack propagation
constitutive model
