During blasting excavation of deep high water pressure rock mass engineering, the surrounding rock mass is subjected to the combined effects of high water pressure, high ground stress and blasting dynamic load. Due to the lack of dynamic test methods and test systems for rocks under high hydraulic pressure and high ground stress, its theoretical research lags far behind engineering practice. Based on the analysis of simplified stresses in deep high hydraulic pressure engineering rocks, a test method for stress wave propagation in high hydraulic pressure and high stress rocks is proposed and a test system is developed, which consists of a high hydraulic pressure loading device and an improved SHPB test system, with the high hydraulic pressure loading device providing high hydrostatic pressure for the rocks and the improved SHPB test system providing axial static stress and a stress wave power source. The high hydrostatic loading device consists of sealing chamber, end cap, gland, seal ring and hydrostatic pump, and achieves key technologies such as axial and radial high pressure water sealing. The feasibility of the high water pressure and high ground stress rock stress wave propagation tests system was verified through high water pressure high ground stress rock stress wave propagation test, and the preliminary research results of the high water pressure rock stress wave propagation attenuation characteristics were obtained. The results show that the high water pressure loading device has good sealing performance and can better simulate the high water pressure, high ground stress and dynamic load in deep rock engineering, and the high water pressure device has no effect on the one-dimensional stress wave propagation in the elastic rod, so the rock stress wave propagation test study can be conducted. When the red sandstone is subjected to a small axial static stress, the rock stress wave propagation velocity and transmission coefficient gradually increase with the increase of water pressure. The reason is that for rocks with less damage, the increase of water pressure helps to improve the wave impedance of the rock.
Jin Jiefang
,
Xiong Huiying
,
Hu Weifeng
,
Xiao Youfeng
. Experimental Device and Preliminary Test for Stress Wave Propagation in High Water Pressure and High Stress Rocks[J]. Chinese Journal of Underground Space and Engineering, 2024
, 20(S2)
: 701
-712
.
DOI: 10.20174/j.JUSE.2024.S2.22
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