SHPB实验过程中岩石变形破坏的实时物像同步分析  

On the Real-time Physical Image Synchronization Analysis for Rock Deformation and Failure Mode Based on SHPB

作　　者：万璋 范立峰 王林 巩荣耀 

机构地区：[1]浙江大学建筑与工程学院,浙江杭州310058 [2]北京工业大学建工学院,北京100024 [3]中铁十二局集团第二工程有限公司,山西太原030032

出　　处：《实验力学》2017年第6期771-780,共10页Journal of Experimental Mechanics

基　　金：国家自然科学基金(11572282;11302191)资助

摘　　要：典型的岩石动态压缩应力-应变曲线有不同的阶段,岩石变形、破坏形态也有不同的图像表征,力学响应和图像表征具有一一对应关系。针对上述特性,组合分离式霍普金森压杆(SHPB)与高速摄像机,建立物像同步分析装置,系统研究了岩石在冲击荷载下完整的应力和应变动态响应,并实时采集图像信号。最终,根据应力波传播理论,编制了物象同步分析程序,通过界面显示可实现力学响应与图像表征同步分析。该程序直观地反映了岩石在冲击荷载作用下,应力-应变曲线中不同阶段的力学特性及与其对应的试样开裂情况、破坏趋势、损伤程度等图像表征,清晰地揭示了岩石变形破坏过程的力学机理。Typical dynamic compression stress-strain curve of rock can be divided into different stages.Moreover,the deformation mode and failure mode of rock have different image representation.There is a one-to-one correspondence between mechanical response and the image representation.In view of above characteristics,aphysical image synchronization analysis device was established by combining split Hopkinson pressure bar（SHPB）with high speed camera.Complete stress and strain dynamic response of rock subjected to impact load were systematically studied;real-time image signals were collected.Finally,based on theory of stress wave,an analyzing program for physical image synchronization was compiled,which can realize synchronous analysis of mechanical response and image representation through interface display.This program can intuitively reflect that under impact load condition,the mechanical characteristics and corresponding specimen cracking,failure trend and damage degree on different stages of stress-strain curve,and can clearly reveal the mechanical mechanism of rock deformation and failure process.

关 键 词：物像同步 岩石 分离式霍普金森压杆(SHPB) 应力-应变关系 动态力学性能 

分 类 号：TU455[建筑科学—岩土工程]