Foundation settlements must be estimated with great care for buildings, towers, power plants, and similar high-coststructures. Except for occasional happy coincidences, soil settlement computations are only best estimates of thedeformation to expect when a load is applied. During settlement the soil transitions from the current body (or self-weight)stress state to a new one under the additional applied load [1]. The statistical accumulation of movements in the direction ofinterest is the settlement. A major factor that greatly complicates foundation design is that the soil parameters have to beobtained on construction site prior the project calculation.The prediction of pile settlements can be achieved as a sum of a pile heel settlement and elastic deformation of pile.Settlement analysis plays an important role in building foundation, even though only few modern buildings collapse fromexcessive settlements, it is not uncommon for a partial collapse or a localized failure in a structural member to occur [8].Excessive settlement and differential movement can cause distortion and cracking in structures [9] especially for rotarymachines which are particularly sensitive to bearing misalignment. In other words, the adequacy of the adopted state-of-theartdesign method may greatly reduce the risk factor of settlement problems without unduly raising foundation costs.The scope of this work is to design the pile foundation that is required for gas and steam turbine equipment on the site ofthe Elektrenai power plant, Lithuania.The current work consists of four parts:1. To assess immediate settlement employing analytical Bowles method2. To assess immediate settlement employing three methods, such as Schmertmann, EN 1997-2 and NEN 67433. To assess immediate settlement employing finite element method that is applied in Plaxis 3D Foundation package4. To compare the experimental results obtained from static load pile test with the computation results obtained byemploying above mentioned methodsIn this work, the deep pile foundation was designed to sustain loads from gas and steam turbine equipment on the site ofthe Elektrenai power plant, Lithuania. In the design of a pile foundation, the required pile length was estimated based on theload from the superstructure, allowable stress in the pile material, and the in situ soil properties Soil properties wereestimated from site investigation and soil exploration program according to Lithuanian regulations. Investigation data werebased on cone penetration and dynamic penetration tests, boreholes, excavations and soil as well as laboratoryinvestigations. From these data, four geological layers were generalized that were applied in design of pile foundation.Pile settlement analysis estimated that total settlement value was 15.6 mm, including 2.1 mm settlements of elasticdeformation of pile from vertical compressive loads. In general, pile settlement should not be more than <2%D (where D isa diameter of the pile). Such settlement criteria was taken according to guidelines for shallow or piled foundationssettlement from IEC (Iberdrola Engineering and Construction) [10], which states the limits for absolute and differentialsettlements in the operational phase and are mainly focused on the long-term settlements.
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