Deformation Characteristics of the Surrounding Rock of a Six-Lane Multiarch Tunnel under Different Excavation Conditions

Table 2

Excavation sequence of excavation scheme I.

Section number	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10	L11	L12
Left hole	L1-1	L2-1	L3-1	L4-1	L5-1	L6-1	L7-1	L8-1	L9-1	L10-1	L11-1	L12-1
	14	15	16	17	18	19	20	21	22	23	24	25
	L1-2	L2-2	L3-2	L4-2	L5-2	L6-2	L7-2	L8-2	L9-2	L10-2	L11-2	L12-2
	30	31	32	33	34	35	36	37	38	39	40	41
Middle wall	L1-3	L2-3	L3-3	L4-3	L5-3	L6-3	L7-3	L8-3	L9-3	L10-3	L11-3	L12-3
	1	2	3	4	5	6	7	8	9	10	11	12
Right hole	L1-4	L2-4	L3-4	L4-4	L5-4	L6-4	L7-4	L8-4	L9-4	L10-4	L11-4	L12-4
	27	28	29	30	31	32	33	34	35	36	37	38
	L1-5	L2-5	L3-5	L4-5	L5-5	L6-5	L7-5	L8-5	L9-5	L10-5	L11-5	L12-5
	14	15	16	17	18	19	20	21	22	23	24	25

Note. Step 13 is the middle wall support, step 26 is the sidewall support, represents the template number, and number represents the excavation step.