The Influence of Moisture Content on the Time-Dependent Characteristics of Rock Material and Its Application to the Construction of a Tunnel Portal

Table 1

Mechanical parameters of specimens at three degrees of saturation.

Submerged; time/hours	Degree of; saturation/%		Uniaxial compressive strength/MPa		Poisson’s ratio		Elasticity modulus/GPa	Triaxial compressive strength		Cohesion /MPa	Internal friction angle /(°)
								Confining; pressures/MPa	Peak; strength/MPa
0 (nature dry)	41.5	88.80		0.30		50.56		2	97.12	25.44	31.84
		95.42		0.32		54.83		5	106.61
		Average	92.11	Average	0.31	Average	52.70	10	124.53
24	80.1	68.92		0.41		17.64		2	73.84	21.32	26.91
		70.78		0.41		19.86		5	82.69
		Average	69.85	Average	0.41	Average	18.75	10	96.21
240	93.5	58.34		0.46		8.32		2	62.18	18.91	24.07
		59.13		0.47		8.73		5	69.95
		Average	58.74	Average	0.47	Average	8.53	10	82.40