Freezing Temperature Field of FSPR under Different Pipe Configurations: A Case Study in Gongbei Tunnel, China

Table 5

Contrast of temperature data of control points at midline.

Measuring point	T0 (°C)	T21 (°C)	ΔT (°C)	V (°C/h)	Time of temperature below freezing point (h)	Δt (h)
m2	19.8	−0.6	−4.4	−0.97	21	−9
m2^∗	22.2	−5.0		−1.30	12
m6	19.2	−0.7	−3.1	−1.03	21	−7
m6^∗	21.6	−3.8		−1.21	14