Mechanical Mechanism of Water Injection to Enhance the Stability of Soft Coal

Table 5

Shape of liquid bridge and variation law of liquid bridge force with water content.

State	Form of liquid bridge			f1	f2	f12	F
	Between small particles	Between large and small particles	Between big particles
I	Pendulum-shaped and cord-shaped	Pendulum-shaped and cord-shaped	Pendulum-shaped	↑	↑	↑	↑
II	Capillary-shaped	Capillary-shaped	Cord-shaped	↑	↑	↑	↑
III	Muddy	Muddy	Capillary-shaped	↓	↓	↓	↑
IV	Muddy	Muddy	Muddy	↓	↓	↓	↓