Abstract
Bored piles settlement behavior under vertical loaded is the main factor that affects the design requirements of single or group of piles in soft soils. The estimation of bored pile settlement is a complicated problem because it depends upon many factors which may include ground conditions, validation of bored pile design method through testing and validation of theoretical or numerical prediction of the settlement value. In this study, a prototype single and bored pile group model of arrangement (1*1, 1*2 and 2*2) for total length to diameter ratios (L/D) is 13.33 and clear spacing three times of diameter, subjected to vertical axial loads. The bored piles model used for the test was 2000 mm in length, and 150 mm in diameter has been constructed in soft clayey soils. Furthermore, different theoretical methods have been used for the estimation of bored pile settlement, such as Poulos and Vesic's methods and then their comparison with the pile load test data based on the quick pile load test as presented in (ASTM-D1143, 2007). In general, the theoretical method for estimation the bored pile settlement by Poulos and Vesic's gives higher value of the settlement for the single and group bored pile compared to the pile settlement results obtained from field pile load test data. Therefore, it is not recommended to be used for soft clayey soils. On the other hand, Hansen’s 90% and Butler and Hoy’s results may be considered reliable interpretation method to compute the settlement of single and group bored pile.
Highlights
The existing subsoil on a particular site might not be adequate for supporting the superstructure, buildings, dams, bridges, and because of the bearing capacity or may not be safe to support the given load
The general behavior of a pile group is related to efficiency. (Khari, et al, 2013) explained that an increase in the number of piles in-group decreases the group efficiency owing to the increasing of overlapped stress zones and active wedge. (Ivšić, et al 2013) studied the assessment of empirical equation and in-situ pile load test conducted to calculate bearing capacity and settlement of bored piles in soft soils. (Deb, et al, 2016) explained that the behavior of pile groups under the applied loads is generally different from that of a single pile due to the interaction of neighboring piles
This paper presents different methods of estimating bored pile settlement based on theoretical methods and their comparison with pile settlement evaluated from pile load test data on cast-in-situ single and group bored piles constructed in Al Nasiriyah city
Summary
The existing subsoil on a particular site might not be adequate for supporting the superstructure, buildings, dams, bridges, and because of the bearing capacity or may not be safe to support the given load. The impact of the compressible layer on the settlement is usually convenient for increasing the number of the pile in the group, because of the interaction of neighboring piles; the pile group’s conductance of under the loads is always a different form of the single pile (Poulos, 2005). (Deb, et al, 2016) explained that the behavior of pile groups under the applied loads is generally different from that of a single pile due to the interaction of neighboring piles. This paper presents different methods of estimating bored pile settlement based on theoretical methods (based on Vesic and Poulos) and their comparison with pile settlement evaluated from pile load test data on cast-in-situ single and group bored piles constructed in Al Nasiriyah city
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