دانلود رایگان مقاله انگلیسی ظرفیت باربری فونداسیون کامپوزیتی جدید با شمع های مرکب بتن-مواد مجزا - اشپرینگر 2017

Abstract

In order to solve the bulging deformation and fracture at the top of widely used gravel piles in treating ground consolidation, a new, optimized composite foundation form was proposed. The composite foundation was constructed using discrete materials and concrete piles. Additionally, various parameters of this new composite foundation were analyzed, including foundation forms, construction technologies, bearing mechanism and failure mode. By applying cavity expansion theory, the Vesic cavity spreading pressure of the discrete material-concrete pile is solved as a polar axis symmetric problem on the basis of Mohr–Coulomb yield criterion. Then the computing formula for the ultimate bearing capacity of the discrete materials-concrete pile is elicited when the internal friction angle of soil in the piles is u = 0 and u = 0. Finally, the ultimate bearing capacity value of the composite foundation is acquired through analytic calculation and numerical simulation. Finally, it is found that the calculation result is 14.4% lower than that of the simulated result, which is within the acceptable accuracy range and therefore proves the accuracy of the analytic calculation method for bearing capacity of the new composite foundation.

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.