Comportamento à compressão de estacas escavadas de pequeno diâmetro em solo sedimentar na região de Santa Maria

Abstract

In this work we study the behavior of excavated small-diameter props to the executed compression in sedimentary soil at the Experimental testing site of Geotechnical Engineering at UFSM(CEEG/UFSM). In geotechnical engineering the projects of superficial and deep foundations are limited by the load capacity and by the permissible stress. In the region of Saint Maria geotechnical workmanships and the projects of foundations present an eminently empirical character. Therefore, the research developed at the CEEG/UFSM comes to supply this deficiency of the regional knowledge, by means of studies and research destined to the forecast of the behavior of various foundations of current use in the region. The CEEG has already implemented this with the preliminary inquiries of the subsoil investigation, characterization and geotechnical assays already carried out by Emmer (2004). The current phase consists of the project and execution of foundations that will undergo behavior verification. For such six props of 0,20m of diameter with changeable depths going from 3.0 to 5.3 meters had been executed and submitted to static load tests with slow loads where different criteria of arched interpretation had been applied to the load-displacement curve to define rupture. The estimates of bearing capacity are obtained by means of correlation methods with standard penetration tests (SPT) and by theoretical methods, being these forecasts later compared with the loads of rupture gotten in the assays and interpreted according to the Brazilian Norm. The comparison between the results of the load tests and the values of load capacity calculated by the studied methods, show that, for the props situated in the sandy-clay layer, these methods underestimate the values of the total load capacity and overestimate the values of the total load capacity for the piles supported over sandy layer.