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Abstract
Settlement of large pile groups is most often estimated by the Alternative Foundation Method. However, this method has some limitations related to assumed uniformity of pile loads. A very big problem is also related to estimating the stiffness of subgrade loaded by a group of piles. Similar problems arise when piled foundation is numerically modelled in Finite Element Method or Boundary Element Method programmes. The results obtained are highly dependent on the input data, especially on characteristics describing soil subgrade stiffness and strength and moduli at pile – soil contact. The paper presents an example of using the results of trial static calculations for the pile made using a technology not identical with that ultimately implemented for the project. The subgrade stiffness modulus was determined with Inverse Analysis using bored pile test load. The results attained were used for further calculations (forecast) the settlement of prefabricated driven pile (a single one) and then to estimate of pile group settlement under full load from bridge structure abutment.
Highlights
Settlement of large pile groups is most often estimated by the Alternative Foundation Method
The scope of testing to be done depends on geotechnical category of a given object, the bridge abutments and piers are classified into the second geotechnical category
The paper presents the way of verifying the soil deformation modulus on the basis of static plate load test (SPLT) which was used to calculate the pile group settlement for Żernicki Bridge in Wrocław
Summary
Design of foundation for bridge structures requires accurate research of soil subgrade, a wide range of geotechnical investigations. They include both laboratory studies and field testing as well; other respective data can be used and interpreted for the limit state under consideration. What need to be stressed, bridge construction subject to special requirements for displacements (settlements) as the damages to the whole structure resulting from these phenomena are not acceptable. The paper presents the way of verifying the soil deformation modulus on the basis of static plate load test (SPLT) which was used to calculate the pile group settlement for Żernicki Bridge in Wrocław
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