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Título

Root Piles Installed Through Heterogeneous Technogenic Layer Followed by a Residual Soil

Palavras-chave

Root Pile, Methodology, Heterogeneous Technogenic Layer, Pile Integrity Test, Dynamic Load Test, Instrumented Static Load Test.

Resumo (no máximo 200 palavras)

The project site is an expansion of ETA Guaraú. The soil profile indicated a heterogeneous technogenic layer of different materials about 30.0 m depth, followed by residual soil. Therefore, the project required root piles with constant cross-sections embedded in the residual soil (36.0 m to 42.0 m depth). The first six test piles allowed the improvement of the drilling equipment, designed to work with compressed air and water simultaneously, overcoming obstacles such as bushing, rubble, and gravel, among others, which conceded the application of air strokes after filling the shaft. The depth of the piles was monitored by torque reading on the drilling rigs in constant advance. Besides, variations in the shaft friction distribution and cross-section along the shaft (mortar over-break rate) were observed due to the soil heterogeneity. Further, the collected signals from the integrity and dynamic tests were atypical and difficult to interpret, constituting an additional challenge due to the project's complexity, and each tested pile had its own identity. Moreover, the dynamic and instrumented static load tests showed higher shaft friction in the landfill, lower in the residual soil, and reduced load at the pile toe. Furthermore, the tests provided quality assurance of the deep foundations.

Palavras Chave

Dynamic Load Test; Heterogeneous Technogenic Layer; Instrumented Static Load Test; Methodology; Pile Integrity Test; Root Pile

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