Three-Dimensional Physical Similarity Simulation of the Deformation and Failure of a Gas Extraction Surface Well in a Mining Area

Table 1

Specifications of the surface wells.

Material	Outer diameter (mm)	Wall thickness (mm)	Length (mm)	Collapse resistance (MPa)	Tube yield strength (kN)	Note
Steel	244.48	11.99	85.66	36.55	6637	N80 casing
PE pipe	12	2	85.66	0.6	—	#1, #2, and #3
Rubber pipe	12	2	85.66	—	—	#4, #5, and #6