Additional Stress on a Buried Pipeline under the Influence of Coal Mining Subsidence

Table 4

Physical and mechanical parameters of the soil around pipeline.

Density, (kg/m^3)	Coefficient of soil-pipeline interface,	Adhesion coefficient,	Coefficient of static earth pressure,	Internal frictional angle, (°)	Cohesion coefficient, (kPa)
1,850	0.7	0.12	0.4	24	23