定侧压下大骨料混凝土的动态双轴破坏准则研究  

Dynamic failure criterion of dam concrete under the compression w ith constant confined stress

作　　者：施林林[1,2] 宋玉普 SHI Linlin;SONG Yupu(Changzhou Key Lab of Structure Engineering and Material Properties,Changzhou Institute of Technology,Changzhou 213032,China;College of Civil and Transportation Engineering University,Hehai University,Nanjing 210098,China;State Key Labor Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]常州工学院常州市建设工程结构与材料性能研究重点实验室,江苏常州213032 [2]河海大学土木与交通工程学院,江苏南京210098 [3]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024

出　　处：《混凝土》2019年第12期103-106,共4页Concrete

基　　金：江苏省博士后科研资助计划项目(1701090B);广东省滨海土木工程耐久性重点实验室开放基金项目(GDDCE16-02);常州市应用基础研究计划(CJ20180042);常州工学院科研基金项目(YN1618)

摘　　要：利用静、动三轴试验机对定侧压下的大骨料混凝土施加动态双轴压荷载,研究不同的侧压力和应变率(应变率为10-5~10-2/s)对大骨料混凝土的受力性能影响。在主应力和八面体应力空间,建立了在不同应变率下大骨料混凝土的双轴破坏准则。试验表明:应变率没有改变材料的破坏形态,大骨料混凝土在动态双轴压荷载下主要为层状劈裂破坏。随着应变率的提高,大骨料混凝土试件表面有更多的骨料破坏,同时断面趋于平整。大骨料混凝土的动态强度随着应变率的增加而增加,随着侧压力大致呈抛物线型变化,且均在侧压力为0.50fc时达到最大值。The experiments of larger aggregate concrete under dynamic biaxial compression with one constant lateral compression are carried out by using a static and dynamic test machine.The relationship between constant lateral compression stress,strain rate(ranging from 10-5 to 10-2/s)and dynamic compression strength of larger aggregate concrete is analyzed.The experimental results have shown that the strain rate is not changed the failure modes,there is parallel plate-type for larger aggregate concrete under biaxial compressive.With the increase of strain rate,the fractured surfaced of the specimens became more and more flattened,and the broken of coarse aggregates is increased.The strength of larger aggregate concrete is increased with the increase of strain rate.The influence of constant lateral compression stress on strength changes approximately by a parabolic-like curve at the same strain rate.The intermediate stress ratios corresponding to the maximum of strength are around 0.50 fc.

关 键 词：大骨料混凝土 应变率 双轴应力 强度 破坏准则 

分 类 号：TU528.041[建筑科学—建筑技术科学]