混凝土恒定围压下冲击加载实验装置研制

摘要

Fordetectingthemechanicalpropertyofhighstrainrateofconcrete,rock,soilandothernon-uniform materials under complex stress state,an experiment device to perform axial impact loading with constant confining pressure was exhibited.The hydrostatic pressure state of specimen was created by using the confining and axial oil cylinders.The axial impact loading on specimen was achieved with large diameter split Hopkinson bar (SHPB)and the dynamic stress-strain curves under constant confining pressure were presented.The advantages of the device are the specimen is under hydrostatic pressure state before applying the axial impact load;the confining pressure of specimen keeps constant during the axial impact loading process.The experiment results denote that the confining pressure has an obvious effect on the dynamic mechanical performance of concrete.%研制可实现混凝土、岩石及土等非均匀材料恒定围压下轴向冲击压缩加载实验装置，研究复杂应力状态下高应变率力学性能。该装置通过围压油缸及轴向油缸对试件施加静水压，利用大直径分离式Hopkinson压杆（SHPB）进行轴向冲击加载，测量恒定围压下材料动态应力－应变曲线。该装置具有冲击加载前试件处于静水压状态、轴向冲击加载过程中试件围压保持恒定不变等优点。结果表明，围压对混凝土材料动态力学性能影响明显。