Evaluation and prediction on vibration environment effect of steel sheet pile based on wave propagation characteristics
Through use of a triaxial vibration meter,monitoring was conducted on the vibratory driven steel sheet pile installation in soft soil of varying thickness in three typical regions.Radial,tangential,and vertical vibration accelerations at different distances from pile sinking point were extracted from the ground surface.Analysis of trends of peak vibration acceleration and peak vibration velocity with varying distances from pile sinking point was carried out with Mathematica and SeismoSignal software.Results indicate that both peak vibration acceleration and peak vibration velocity in soft soil regions undergo abrupt changes at a certain distance from pile sinking point which result from compressed waves propagating to the ground,defining this distance as the critical distance.Using the GDS-RCA resonance column triaxial vibration meter,the shear modulus of soil at different distances from pile sinking point before and after vibratory pile driving was tested at the three sites.Factors influencing the critical distance were determined,and a relationship between the difference in peak vibration velocity at the critical distance and the thickness of the soft soil layer,the ratio of soil impedance,and the critical distance was established.An improved equation for predicting peak vibration velocity was derived from the test data.This improved equation not only accurately reflects the effects of different thicknesses of soft soil layers,soil parameters,and critical distance on peak vibration velocity,but also provides a more realistic representation of the vibration attenuation pattern in soft soil areas.
NETL
NSTL
万方数据
