Experimental study of rock cutting under external hydrostatic pressure

Rock Failure and Crack Propagation Beneath Disc Cutters

“…They described the changing failure mode at higher confinement levels with a transition from brittle to ductile material behaviour at a confining stress of 7-17 MPa. Similar results were obtained by Kaitkay and Lei (2005). Both studies reveal a significant indentation force increase at higher confinement levels.…”

“…A number of indentation tests with active confinement were carried out to simulate such situations. The studies of Gnirk and Cheatham (1965) and Kaitkay and Lei (2005), already mentioned in Sect. 1.2, are not representative of a TBM tunnel face because pressure is applied on all sides of the specimens (hydrostatic pressure).…”

Effect of high hyperbaric pressure on rock cutting process

“…They cannot be used to estimate the rock cutting forces under hyperbaric conditions because the pore water pressure and the effect of the cutting speed are not taken into account. Kaitkay and Lei (2005) conducted lab experiments on the influence of hydrostatic pressure on rock cutting with drill bits on Carthage Engineering Geology 196 (2015) [24][25][26][27][28][29][30][31][32][33][34][35][36] marble. They found that the increase of confining pressure transformed the cutting process from a brittle to a ductile-brittle failure mode.…”

Distinct element modeling of laser assisted milling of silicon nitride ceramics

“…Huang [21] used PFC 2D , a distinct element code, to conduct rock cutting simulation. Kaitkay and Lei [22] and Ledgerwood [23] developed DEM models to simulate rock cutting under different hydrostatic pressures. Considering the features of silicon nitride ceramics, Lei and Yang [24] applied DEM to orthogonal cutting of ceramics and then Shen and Lei [25,26] extended it to LAM of ceramics.…”