Research Article

Mechanical Model of the Initial Leg Pressure Increment of the Shield and Its Application to Monitor Roof Load in Longwall Panels

Table 3

Typical difference in leg pressure increment in the same period.

Shield number61605958

Initial setting time2 : 482 : 522 : 522 : 56
Initial setting pressure (MPa)13.4526.326.0527.55
Pressure after ten minutes (MPa)21.6526.2525.827.55
Leg pressure increment (MPa)8.25−0.05−0.250