Prediction of Ground Vibrations During Pile Driving

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             The soil consist of 8 layer based on N-SPT data. At the depth of 0 - 4 m is sand with loose type of soil, at the depth 5 - 12 m is silty sand berupa pasir berlanau with loose type of soil, at the depth 13 - 16 m is sand with loose type of soil, at the depth 17 - 22 m is silty sand with loose type of soil, at the depth 23 - 27 m with stiff type of soil, at the depth 28 - 29 m is clay with stiff type of soil, at the depth 30 - 31 m is clayey sand with stiff type of soil and at the depth 32 - 40 m is clay with stiff type of soil.
             The pile was made of concrete and was modelled with length 33 m and have 0,35 m for the diamete by means of the linear elastic model considering non-porous behavior. The properties of the soils and pile is listed in Table 1 below.
             Table 1. Input Parameter.
             Material.
             Unit.
             Pile.
             Soil.
             sand.
             silty sand.
             sand.
             silty sand.
             clay.
             clay.
             clayey sand.
             clay.
             Depth.
             m.
             0-33.
             0-4.
             5-12.
             13-16.
             17-22.
             23-27.
             28-29.
             30-31.
             32-40.
             N-SPT.
             -.
             -.
             2.
             5.
             6.
             6.
             9.
             9.
             30.
             >50.
             Type of soil.
             -.
             -.
             Loose.
             Loose.
             Loose.
             Loose.
             Stiff.
             Stiff.
             Stiff.
             Stiff.
             Modell.
             -.
             Linear elastic.
             Hardening soil.
             Hardening soil.
             Hardening soil.
             Hardening soil.
             Mohr coloumb.
             Mohr coloumb.
             Mohr coloumb.
             Mohr coloumb.
             Type.
             -.
             Non porous.
             Undrained.
             Undrained.
             Undrained.
             Undrained.
             Undrained.
             Undrained.
             Undrained.
             Undrained.
             Unit weight above phreatic level.
             KN/m3.
             24.
             15.
             17.
             16.
             17.
             18.
             18.
             18.
             25.
             Unit weight below phreatic level.
             KN/m3.
             -.
             16,8.
             18,8.
             17,8.
             18,8.
             19,8.
             19,8.
             19,8.
             27.
             Young's Modulus.
             KN/m2.
             30000000.
             50000.
             50000.
             50000.
             50000.
             15000.
             15000.
             15000.
             15000.
             Poisson ratio.
             -.
             0,1.
             0,15.
             0,15.
             0,15.
             0,15.
             0,3.
             0,3.
             0,3.
             0,2.
             Cohession.
             KN/m2.
             -.
             1.
             2.
             1.
             2.
             33.
             37.
             33.
             40.
             Friction angle.
             o.
             -.
             5.
             4,5.
             5.
             4,5.
             7.
             7.
             24.
             26.
             2.2 Geometry Modell.
             The length of geometry is 340 m and the depth is 40 m with 8 layer of soil. The pile was located on the right side of geometry with length 33 m and diametre 0,35 m, it was added dynamic load (~A) on the middle surface of the top of pile. Figure below, shows input geometry for the modell.
             Figure 1. Geometry modell.
             2.3 Initiall Condition.
             The triangular mesh was generated with a global coarseness set to coarse and then a local refinement was made in the pile cluster.