8 Conclusions
Aiming at the characteristic of the bugling deformation and fracture at the top of gravel piles, a new, optimized composite foundation form was proposed. The composite foundation with compound piles was constructed using discrete materials and concrete piles. Additionally, various parameters of the new composite foundation of discrete material-concrete compound pile were analyzed, including foundation form, construction technologies, bearing mechanism, failure modes and calculation steps for the bearing capacity. The following conclusions were obtained.
1. In the precondition of improving pile strength as well as the vertical and horizontal bearing capacities of the new discrete material-concrete compound pile, the project cost is decreased. In addition, the compound pile has other advantages such as simple construction technology and strong practicability.
2. The bearing mechanism of the discrete materialconcrete pile composite foundation is not simple superposition of discrete materials and concrete. However, it is an organic whole of discrete materials, concrete, and surrounding soil constructed by the permeation of the concrete grout to a certain depth of the discrete materials to effectively connect with the latter. Therefore, the compositions are deformed compatibly and bear stress jointly.
