Experimental and Numerical Simulation Study on the Shear Strength Characteristics of Magnolia multiflora Root-Soil Composites

Table 3

Laboratory results of the direct shear test.

Plant species	Root angle with the horizontal direction	Curve fitting	R^2 (%)	c (kPa)	tanφ	φ (°)
No root	—	y = 0.5646x + 4.435	99.43	4.435	0.564	29.449
	90° + 90°	y = 0.6890x + 7.792	99.62	7.792	0.689	34.567
M. multiflora	45° + 45°	y = 0.7197x + 7.085	99.47	7.085	0.719	35.743
	45° + 90°	y = 0.7532x + 8.292	99.53	8.292	0.753	36.987