Experimental Study on Interface Frictional Characteristics between Sand and Steel Pipe Jacking

In order to study the variation law of shear frictional characteristics steel pipe jacking and sand interface under different working conditions, stress–strain curve between five particle sizes normal stress slurry lubrication conditions was measured by using a direct device, internal friction angle, coefficient cohesion pipe–soil were calculated regression analysis. The test results show that decreases with increase average size sand, strain-softening phenomenon occurs. does not change trend at interface, peak residual values stress. condition are smaller than those no condition. soil lubricated about 20%. angle decrease size, there is obvious pattern quantity relationship size.