Experimental Study on Shear Strength of Root Composite Tailing Soil Based on Interfacial Bonding

Table 5

Internal friction angle and growth range of sample.

Types
	Angle of internal friction/(°)	Angle of internal friction increase/%	Angle of internal friction/(°)	Angle of internal friction increase/%	Angle of internal friction/(°)	Angle of internal friction increase/%
RS	28.89	9.64	30.21	14.65	30.69	16.47
NRS	29.34	11.35	31.82	20.76	31.14	18.18
GRS	30.22	14.69	29.42	11.65	31.56	19.77

Note: The internal friction angle of the tailing soil is 26.35°.