Abstract
Abstract The methodologies for designing pile foundations can be complex since the simultaneous interactions among the block, piles and surrounding soil should be taken into account. Therefore, in addition to the discussions on construction, instrumentation, testing and simulation of a defective pile, this paper discusses the practical issues arising from the observed numerical using three-dimensional finite elements and experimental studies. The main issues discussed in this paper refer to as the decrease in load capacity of bored instrumented piles when subjected to a structural defect. It was observed in the results that given the presence of the defect, the failure load of the system has decreased from 190 kN to 110 kN, i.e. around 40% reduction of the intact reference value. Using the data obtained by numerical analysis, laboratory test, and field application, it was possible that the results were satisfactory and reasonable, enhancing our understanding of this complex foundation system’s behavior, especially in the presence of a defective pile.
Highlights
When a deep foundation is designed in the traditional manner, only the piles have the ability to receive and distribute superstructure loads imposed on the surrounding soils
We present and discusses the experimental results obtained for the piled block founded on a single defective pile (DPR(EXP)), via static load test, and the numerical simulations via 3D finite element method (FEM) modeling using CESAR-LCPC software (DPR(NUM) and IPR(NUM))
Note: ΝE is the number of piles under the block, ΝPD the number of defective piles under the block, ΔQ the load increment applied at each loading stage, Pu the geotechnical ultimate load capacity of the foundation, ρMRUPT the average settlement at ultimate load capacity, ρMAX the maximum settlement at the end of the loading stage; and ρDMAX the maximum differential settlement
Summary
When a deep foundation is designed in the traditional manner, only the piles have the ability to receive and distribute superstructure loads imposed on the surrounding soils. In this case, the (positive) contribution of the pile cap is ignored, in terms of the bearing capacity, so it is assumed that the foundation behaves as a piled group. The present paper is related to a piled block system foundation, given that the block contribution has been taken into account and effects of interactions among different components of the foundation system (pile, soil and block) are considered. The studies on the use of pile blocks in tropical soils are rarely reported. The studies on simulation of defected piles within piled block systems are scarce, especially for large-scale models
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