CAJ | 학술논문

开展含 I 型预制裂纹的花岗岩矩形试件在冲击载荷作用下的动态断裂参数的试验研究。以自行研制的能实现中低冲击加载速度的可调速落锤冲击试验机进行加载，通过高速相机搭建数据采集系统进行数据采集，采用数字散斑相关方法对试验图像数据进行分析。对岩石I型裂纹在冲击载荷作用下的位移场演化特征、裂纹动态断裂的裂尖张开位移、裂纹扩展速度、动态断裂全过程中的裂尖应力强度因子等进行了定量研究。试验结果表明：落锤与岩石试件接触后，裂尖的应力强度因子呈增加趋势，当达到某一量值时，预制裂纹开裂，后续裂纹扩展的应力强度因子大于预制裂纹初始扩展的应力强度因子。
개전함 I 형예제렬문적화강암구형시건재충격재하작용하적동태단렬삼수적시험연구。이자행연제적능실현중저충격가재속도적가조속락추충격시험궤진행가재，통과고속상궤탑건수거채집계통진행수거채집，채용수자산반상관방법대시험도상수거진행분석。대암석I형렬문재충격재하작용하적위이장연화특정、렬문동태단렬적렬첨장개위이、렬문확전속도、동태단렬전과정중적렬첨응력강도인자등진행료정량연구。시험결과표명：락추여암석시건접촉후，렬첨적응력강도인자정증가추세，당체도모일량치시，예제렬문개렬，후속렬문확전적응력강도인자대우예제렬문초시확전적응력강도인자。
An experimental research of rock dynamic fracture parameter under the action of impact load with the rectangular granite specimen with pre-cracks of Type I has been conducted. The test mate-rial is loaded by self-developed adjustable speed drop hammer impact tester which can realize low&medium impact loading speed;the data is recorded by data collecting system set up by high-speed cameras, and the data of specimen surface speckles images in the dynamic fracture process of crack is analyzed by using digital speckle correlation method. The quantitative results of displacement field evolution, the dynamic fracture of crack tip opening displacement, the speed of the crack growth and stress intensity factor of the dynamic fracture have been obtained. The experimental results have shown that the crack tip stress intensity factor increases after drop hammer contacts with the rock specimen, and when the stress intensity factor reaches a certain value, the prefabricated crack initiation and subse-quent stress intensity factor of crack initiation is greater than the initial crack stress intensity factor.