A vibration point load tester is designed in this paper, for studying the mechanical properties of rock subjected to a cyclic point load, with different vibration frequencies and excitiong forces. The instrument consists of a static loading unit and a vibration loading unit. The former is a hydrostatic pressure device fixed on the bottom platform of the bracket. And the latter is a special vibration motor, installed on the top platform of the bracket. The upper loading cone and the special vibration motor are cast as a whole. The lower loading cone is connected with the upper pressurized piston of the hydrostatic pressure device, and can move up and down through the diaphragm hole. Different excitiong forces and frequencies can be assigned by adjusting the eccentric block's angle and the motor speed, then the point load and the acting time for reaching the failure point of the rock body under a given excitiong force and frequency can be determined. And the best combination of the vibration frequency and the excitiong force, with the best rock fragmentation efficiency and the least harm to boring machine cutters, can be obtained.
ZHOU Zilong
,
WU Zhibo
,
ZHAO Yunlong
. The Design of Vibration Point Load Tester[J]. Science & Technology Review, 2014
, 32(18)
: 31
-35
.
DOI: 10.3981/j.issn.1000-7857.2014.18.004
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