NUMERICAL MODELING OF USING PILES TO RESIST HEAVE IN EXPANSIVE SOIL

Tarek N. Salem, Nagwa R. El-sakhawy, Rehab A. E. El-sayed

Abstract


Expansive soil causes considerable damages to structures all over the world. It is necessary that when designing foundations resting over expansive soils, the expected heave of foundations should be calculated and consequently accounted for. Piles foundations are an alternative for the cases of highly expansive soils extending to deep layers under the foundations, especially in light weight structures. This paper presents numerical modeling of piles in expansive soils. The finite element software (ADINA) is used in the modeling, Cam-Clay soil model representing the expansive soils. As a verification of the proposed numerical model, a well documented case study of piles constructed in expansive soil is used. The case of TRACON building located at Denver International Airport (DIA), Denver, Colorado, in which the pile behavior is tracked and measured for six years continuously. Results showed good agreement between the measured values and the reproduced numerical results. The verified numerical model is used in the analysis of cases of single piles, belled piles, and pile groups. Results showed that pile groups are more effective than belled piles in reducing the total heave than single piles

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