ANALYSIS OF EFFECT OF PILE DRIVING ON THE EXISTING FOUNDATION (VIBRATION MONITORING)
The article presents the results of the analysis of the effect of vibration exposure pile driving on the existing foundations of a functioning oil and gas complex located in Tengiz city. The aim of the tests (vibration monitoring) was to determine the smallest allowable distance piling devices excluding the impact of vibration on the foundation and ensuring the safe operation of the plant. The article presents the results of vibration exposure piling at different distances from the base, taking into account the natural oscillations of technological processes, solid foundation and others, as well as the results of excitation of ground mass at various distances from the source of vibration exposure (pile driving). The source of the vibration excitation was pile driving (С16-40) through pile-driving equipment Banut 555 with a mass of hydraulic hammer 6,075 tonnes and a maximum drop height 1.0 m. In case of driving of piles was drawn up the statement of pile-driving. Vibromonitoring was carried out by the instrument Profound VIBRA +, with use of the 3D seismic sensors. The interval of measurement of vibration was carried out every 5 seconds. Tests were executed according to requirements of norm of DIN 4150-3 according to which the most allowed level of vibration is equal 5,00 mm/sec. (from 0-10 Hz). The maximum impact on a soil array was recorded at a distance 40 m from a source in case of driving of piles No. 3, 5 and 6. In all cases the maximum values of speed of oscillations were recorded when dipping C16-40 piles on depth from 5 to 8 m.