Study on Mechanical Properties and Nonlinear Strength Model of Deep Water-Sensitive Rock in Xianglu Mountain Tunnel

Table 2

Characteristic strength of rocks under different confining pressures.

Confining pressure/MPa	Peak strength/MPa		Increment of peak strength/MPa		Residual strength/MPa		Increment of residual strength/MPa
	Limestone	Silty mudstone	Limestone	Silty mudstone	Limestone	Silty mudstone	Limestone	Silty mudstone
0	64.8	16.3	—	—	3.8	0.8	—	—
10	140.3	69.5	75.5	53.2	77.6	49.6	73.8	48.8
20	209.6	116.3	69.3	46.8	131.5	93.8	53.9	44.2
30	262.8	152.2	53.2	35.9	175.5	130.8	44.0	37.0
40	295.8	186.0	33.0	33.8	209.5	172.4	34.0	41.6
50	333.6	209.3	37.8	23.3	248.9	199.6	39.4	27.2