Development of Similar Materials for Liquid-Solid Coupling and Its Application in Water Outburst and Mud Outburst Model Test of Deep Tunnel

Table 5

Water absorption and softening coefficient of similar materials after immersion in water.

Proportion of red clay	Specimen number	Water absorption (%)	Average water absorption (%)	Strength after immersion (MPa)	Mean intensity (MPa)	Softening factor
	1-4	4.31		0.36
1.06	1-5	5.16	4.77	0.32	0.35	0.95
	1-6	4.83		0.37
	2-4	4.55		0.45
2.44	2-5	4.46	4.43	0.48	0.47	0.92
	2-6	4.28		0.47
	3-4	3.49		0.45
3.78	3-5	3.43	3.67	0.38	0.42	0.89
	3-6	4.08		0.42
	4-4	2.93		0.35
5.08	4-5	2.64	2.82	0.33	0.36	0.86
	4-6	2.89		0.41
	5-4	2.94		0.31
6.35	5-5	3.56	3.51	0.34	0.34	0.85
	5-6	4.04		0.37
	6-4	6.11		0.52
7.59	6-5	5.63	5.77	0.49	0.48	0.79
	6-6	5.56		0.44
	7-4	3.35		0.36
8.79	7-5	3.87	3.56	0.42	0.39	0.78
	7-6	3.47		0.38
	8-4	3.53		0.43
9.97	8-5	3.86	3.86	0.41	0.41	0.75
	8-6	4.19		0.39