摘要 为探明灌浆料和混凝土的结合性能,通过结合体抗压强度试验、结合体劈裂抗拉强度试验和结合体破坏形式统计分析,研究了灌浆时机、混凝土强度等级、龄期等因素对灌浆料和混凝土结合体的力学性能及其破坏形式的影响,以期为隧道衬砌灌浆施工提供参考。结果表明:不同灌浆时机下,混凝土和灌浆料的结合抗压强度均高于混凝土本体的抗压强度,而结合劈拉强度低于混凝土本体的劈拉强度。混凝土和灌浆料结合抗压的破坏形式主要为整体破坏,早龄期时整体破坏率偏低,随着龄期的增加,结合体的整体破坏率显著提高。在混凝土浇筑24 h后注浆,不仅可使结合抗压强度的提升有保障,并获得较高的结合劈拉强度,还能降低隧道衬砌拱顶产生二次脱空的风险。 To clarify the bonding performance of grouting material and concrete,we studied the effect of grouting time,concrete strength grade,age and other factors on the mechanical properties and failure mode of the combination of grouting material and concrete through the combination compressive strength test,the combination splitting tensile strength test and the statistical analysis of combination failure mode,which could provide a reference for the grouting construction of tunnel lining.Results indicate that,under different grouting time,the combination compressive strength of concrete and grouting material is higher than that of concrete body,while the combination splitting tensile strength is lower than that of concrete body.The failure mode of the combination of concrete and grouting material is mainly the whole body failure.The whole body failure rate is low at early age,but with the increase of age,the whole body failure rate increases significantly.Grouting after 24 hours of concrete pouring can ensure the improvement of the combination compressive strength,obtain high combination splitting strength,and reduce the risk of secondary void of tunnel lining vault.
出处 《中国港湾建设》 2021年第4期36-40,共5页 China Harbour Engineering
基金 中交一航局科技研发项目(2019-10-2,2017-8-3)。
关键词 隧道衬砌 灌浆 结合性能 抗压强度 破坏形式 tunnel lining grouting bonding performance compressive strength failure mode
