Dynamic Fracture Properties of Rocks Subjected to Static Pre-load Using Notched Semi-circular Bend Method

被引:73
作者
Chen, Rong [1 ]
Li, Kang [1 ]
Xia, Kaiwen [2 ,3 ]
Lin, Yuliang [1 ]
Yao, Wei [2 ,3 ]
Lu, Fangyun [1 ]
机构
[1] Natl Univ Def Technol, Coll Sci, Changsha 410073, Hunan, Peoples R China
[2] Univ Toronto, Dept Civil Engn, Toronto, ON M5S 1A4, Canada
[3] Univ Toronto, Lassonde Inst, Toronto, ON M5S 1A4, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Fracture toughness; Pre-load; SHPB; NSCB; FEM; HOPKINSON PRESSURE BAR; TOUGHNESS; GRANITE; PARAMETERS; TESTS;
D O I
10.1007/s00603-016-0958-4
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
A dynamic load superposed on a static pre-load is a key problem in deep underground rock engineering projects. Based on a modified split Hopkinson pressure bar test system, the notched semi-circular bend (NSCB) method is selected to investigate the fracture initiation toughness of rocks subjected to pre-load. In this study, a two-dimensional ANSYS finite element simulation model is developed to calculate the dimensionless stress intensity factor. Three groups of NSCB specimen are tested under a pre-load of 0, 37 and 74 % of the maximum static load and with the loading rate ranging from 0 to 60 GPa m(1/2) s(-1). The results show that under a given pre-load, the fracture initiation toughness of rock increases with the loading rate, resembling the typical rate dependence of materials. Furthermore, the dynamic rock fracture toughness decreases with the static pre-load at a given loading rate. The total fracture toughness, defined as the sum of the dynamic fracture toughness and initial stress intensity factor calculated from the pre-load, increases with the pre-load at a given loading rate. An empirical equation is used to represent the effect of loading rate and pre-load force, and the results show that this equation can depict the trend of the experimental data.
引用
收藏
页码:3865 / 3872
页数:8
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