Research on the Reuse of Discharged Soil from EBP Shield Tunnels in Synchronous Grouting Material

Table 9

Stratum stress release coefficient at each stage of construction.

Construction simulation steps	1	2	3	4	5	6
Corresponding tunneling stage	Passing stage	Segment off the ring for 0∼8h	Segment off the ring for 8∼16 h	Segment off the ring for 16∼24 h	Grouting hardening for 1∼7 d	Grouting hardening for 7∼28 d
Settlement stage	Passing settlement	Off-ring settlement			Subsequent settlement
Release coefficient (%)	15	30	25	15	10	5
	15	70			15