Abstract
In this paper, a method is proposed to secure an autonomous underwater blasting vibration test (UBVT) system with plugs to deep-water rock, and its specific configuration concept and plugging principle are illustrated. Using the principle of statics, a mathematical model is established for the squeezing force in the process of pressing the hole-plug device (HPD) into holes in rocks. The tension-compression test is conducted on the plugs in round granite holes to obtain the axial pressure-displacement curves of the pressing process with the HPD spring parameter K, friction coefficient μ between the HPD and the rock-wall, and the dynamic contact friction attributes between the metallic HPD and the rock-wall of hole in granite. The axial pressure with such parameters as K, μ, and the squeezing velocity v, among others, and the four steps of the pressing process are numerically simulated. The relations of the characteristic squeezing force with K, μ, and v, as well as the mechanisms of these parameters that influence HPD usage and the sensitivity coefficient, are revealed. The findings of the present study provide references for setting the HPD configuration parameters and for formulating plug-specific construction methods.
Highlights
Seismic waves generated by deep-water rock blasting may damage the safety of underwater structures and facilities, and their deep-water propagation and hazardous effects have become problems that remain to be solved in this field [1,2,3,4,5,6]
Limited by underwater blasting vibration test (UBVT) techniques and means, current study of underwater blasting vibration mainly concentrates on the response of land ground and structures, deep-water rock blasting vibration effects have been rarely reported at home and abroad [9,10,11]
To solve problems of securing the test system to seabed rock and to ensure no relative displacement occurs between the system and the underwater measuring point under the blasting vibration effects, we presented methods of plugging the test system into underwater rock with holes [15]
Summary
Seismic waves generated by deep-water rock blasting may damage the safety of underwater structures and facilities, and their deep-water propagation and hazardous effects have become problems that remain to be solved in this field [1,2,3,4,5,6]. The UBVT system provides technical support for testing the underwater blasting vibration effects, and the method of securing the test system to seabed rock offers engineering support. To solve problems of securing the test system to seabed rock and to ensure no relative displacement occurs between the system and the underwater measuring point under the blasting vibration effects, we presented methods of plugging the test system into underwater rock with holes [15].
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