Comparative Study on Mineral-Scale Microcrack Propagation of Shale under Different Loading Methods

Table 2

Parameters of cohesive elements in minerals (at boundaries of CPE4) and cohesive elements at boundaries of dissimilar minerals.

Cohesive element	Knn (MPa·m^−1)	Kss (MPa·m^−1)	Ktt (MPa·m^−1)	Tensile strength (MPa)	Shear strength (MPa)
In quartz	120	120	120	6	12
In feldspar	110	110	110	5	10
In kaolinite	90	90	90	2	4
In illite	80	80	80	1	2
At the boundaries of dissimilar minerals	100	100	100	3	6