岩石-钢纤维混凝土复合层动态抗压强度计算模型  

Dynamic compressive strength model for rock-steel fiber-reinforced concrete composite layer

作　　者：陈猛[1] 田矣涵 崔秀文 张通[1] CHENG Meng;TIAN Yihan;CUI Xiuwen;ZHANG Tong(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《岩土工程学报》2024年第10期2229-2236,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52178382,52308395);博士后创新人才支持计划项目(BX20230063);中国博士后科学基金面上项目(2023M730526);中央高校基本科研业务专项资金项目(N2201023,N2301023);辽宁省博士科研启动基金计划项目(2023-BS-058)。

摘　　要：为了研究冲击荷载下岩石-钢纤维混凝土(R-SFRC)复合层的抗压强度模型,利用分离式霍普金森压杆对花岗岩、混凝土和R-SFRC复合层进行动态冲击压缩试验,并通过回归试验结果得到R-SFRC复合层的对数型、幂函数型和强度-应变率依赖机制型3种强度模型,同时考虑R-SFRC复合层界面相互作用,基于Mohr-Coulomb强度准则建立复合层动态抗压强度计算模型。结果表明,R-SFRC复合层动态抗压强度随应变率及钢纤维掺量增大而增大;3种回归模型拟合复合层动态抗压强度试验结果的相关系数范围为0.918~0.999,其中依赖机制型模型与试验结果的相关性最大;基于Mohr-Coulomb强度准则的3种模型得到的复合层抗压强度计算值相对试验值的误差范围为-9.23%~3.16%,对数型模型的误差最大值较小。R-SFRC复合层动态抗压强度计算模型可为混凝土支护隧道围岩设计提供理论基础。In order to study the compressive strength model for rock-steel fiber-reinforced concrete(R-SFRC)composite layer under impact loading,the dynamic impact compression tests on the granite,concrete and R-SFRC composite layer are carried out by using the separated Hopkinson pressure bar to obtain the dynamic compressive strengths of different materials.With the regression fitting of the test results,three types of strength models for the R-SFRC composite layer called logarithmic,power function and strength-strain rate dependent mechanism are obtained,and the dynamic compressive strength models for the R-SFRC composite layer are established based on the Mohr-Coulomb strength criterion considering the interface interaction of the R-SFRC composite layer.The results show that the dynamic compressive strength of the R-SFRC composite layer increases with the increase of the strain rate and steel fiber content,and the range of the correlation coefficient of three regression models is 0.918~0.999,and the R2 of the dependent mechanism model is the largest.The error range of the theoretical value of the dynamic compressive strength calculated based on the Mohr-Coulomb strength criterion relative to the test value is-9.23%~3.16%,and the maximum error value of the logarithmic model is the smallest.The computational model for the dynamic compressive strength of the R-SFRC composite layer can provide a theoretical basis for the design of the surrounding rock of concrete-supported tunnels.

关 键 词：岩石 钢纤维混凝土 动态抗压强度 应变率 Mohr-Coulomb强度准则 强度预测模型 

分 类 号：TU45[建筑科学—岩土工程]