Study on the mechanism of cement-soil pile action in cement-soil pile composite soil nails

Geotechnical engineering;  Composite soil nail support;  Mechanism of action;  Force deformation

Compared with ordinary soil nail support, the cement-soil pile composite soil nail support system has the dual functions of water stop and foundation pit side wall support, which can reduce the lateral shift of the pit wall, increase the construction excavation speed, and uniformly affect the soil nail and improve the environmental impact. Through the comparative analysis of the stress deformation mechanism of composite soil nails, the mechanism of increasing the self-standing air height of cement soil piles, the frictional force transmission mechanism of pile soil, the integration mechanism of the side shift curve of the support system and the forward movement mechanism of the advantageous slip surface of the edge wall of the foundation pit were studied, which has certain theoretical guiding significance for improving the lateral shift control measures and accelerating the construction progress of such support systems.