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In order to study the influence of design factors of capped pipe pile composite foundation on differential settlement of expressways, using a geotechnical centrifugal model test platform, a centrifugal model of widen roadbed has been constructed. The effects of pile length, pile spacing, pile cap and cushion thickness on differential settlement were analyzed through comparative experiments. The test results show that increasing the pile length, pile cap size and cushion thickness can effectively control the differential settlement between old and new embankments. The research results can provide a theoretical basis for the design of composite foundations with capped pipe piles.

Sliding friction torque does dissipative work on the force-bearer, transforming the kinetic energy of the bearer into internal energy and others of the bearer. Sliding friction countertorque does dissipative work on the applying body, transforming the kinetic energy of the bearer into internal energy and others of the applying body. In the experiment, the dissipative work done by sliding friction torque on the bearer is measured and calculated, the increase value of the internal energy of the bearer is measured and calculated, and the increase value of the internal energy of the applying body is measured and calculated. The consistency between their respective dissipative work and their respective internal energy increase value is compared.