Freezing Damage Control of Railway Subgrade Miniature Shields in Cold Climatic Regions: Construction Technology Optimization via Numerical Simulation

Table 5

Construction conditions with different pipe diameter intervals.

Segment material	Interval-to-pipe diameter ratio	Construction sequence	Construction condition
Steel pipe	0	One side in the same direction	Condition 5
Steel pipe	1	Ditto	Condition 6
Steel pipe	2	Ditto	Condition 7
Steel pipe	3	Ditto	Condition 8
Steel pipe	4	Ditto	Condition 9
PE tube	0	Ditto	Condition 10
PE tube	1	Ditto	Condition 11
PE tube	2	Ditto	Condition 12
PE tube	3	Ditto	Condition 13
PE tube	4	Ditto	Condition 14