Failure Characteristics of Sandstone With Different Properties Under Pulsed Water Jet Impact
The rock of a tunnel excavation project is selected as the target,and the pulse jet erosion experiments are carried out on siltstone,medium sandstone and coarse sandstone.The erosion characteristics of three kinds of sandstones under different erosion time,erosion distance and erosion pressure are compared.The results show that siltstone is easier to produce a larger crushing area and the best rock breaking effect.Taking the standard working condition of this experiment as an example(t=50 s,Pj=20 MPa and S=4),the erosion depth of siltstone can reach 1.77 times that of medium sandstone and 3.43 times that of coarse sandstone.The erosion area can reach 6.5 times that of medium sandstone and 4.96 times that of coarse sandstone.With the increase of erosion time and ero-sion pressure,the erosion index of sandstone increases.With the increase of target distance,the erosion index of sandstone increases first and then decreases.
pulsed water jetsandstonefailure characteristiccrushing mechanism
万方数据
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