The history of rescuing reinforcement and the preliminary study of preventive protection system for the cliff of Mogao Grottoes in Dunhuang, China

Heritage Science

Table 1 Physical and mechanical parameters of different cave temple cliff

Sites	Number of the engineering rock group	Density (g/cm³)	Compressive strength (MPa)	Tensile strength (MPa)	Cohesion (MPa)	Internal friction angle (°)	Elastic modulus (MPa)	Poisson’s ratio
Mogao Grottoes	Q₃	2.30	–	0.20	0.10	40	100	0.30
	Q₂-A	2.40	9.50	0.36	0.20	55	200	0.28
	Q₂-B	2.15	12.6	0.54	0.08	38	87	0.31
	Q₂-C	2.45	8.60	0.47	0.25	57	300	0.27
	Q₂-D	2.55	15.8	0.67	0.30	60	500	0.26
	Retaining wall	2.50	–	1.50	0.45	70	1000	0.27
Maijishan Grottoes [43,44,45]		2.33	10.95	0.94	–	–	–	–
Beishiku Temple [46]		2.02	22.79	–	–	–	–	–
Yungang Grottoes [47, 48]		2.16	30.0	5.39	1	30.45	3494	0.20