Analysis of Structural Characteristics of Underground Cavern Group by Simulating All Cavern Excavation

Table 3

Depth of failure zone of surrounding rock. (unit: mm).

Location		T1	T2	T3
The main powerhouse	Upstream side wall	17.53	14.98	13.58
	Downstream side wall	6.08	5.03	3.86
The main transformer chamber	Upstream side wall	8.65	5.43	2.08
	Downstream side wall	0.52	0.48	0.36