Abstract
With the development of urban construction, it is inevitable that new or expanded highways cross or parallel with existing buried pipelines. The impact vibration caused by the construction of perforated pile foundation of highway bridge is bound to have adverse effects on the safe operation of adjacent buried pipelines. Based on the micro seismic monitoring technique, the characteristics of pile foundation construction vibration is researched. A series of sensors are placed on the surface and adjacent pipelines to collect micro seismic events of impact hammer on different hoisting height and different excavation depth of pile foundation construction. Thus, the wave characteristics, spectrum characteristics and energy attenuation law of microseismic signal are analyzed, and the influencing factors of construction vibration are studied. It is found that the peak value of acceleration vibration in the vertical direction is the largest, followed by the peak value of radial acceleration vibration, the vibration energy decays in power relation with the propagation distance, and with the increase of the pile hole depth, the vibration velocity of the same horizontal distance decreases gradually. The attenuation is related to the geological condition of a certain pile hole depth. The research results have some guiding significance for the vibration control of pile foundation construction.
Highlights
Impact vibration of highway bridge pile foundation causes deformation of rock and soil medium
The selected typical original signals obtained directly from the test site are shown in Figure 4 and Figure 5, where n, e and v are the signals measured by the three-component vibration pickup respectively in horizontal radial direction, horizontal tangential direction and vertical direction
The maximum acceleration vibration peak of the medium particle is in the vertical direction, followed by the radial acceleration vibration peak
Summary
Impact vibration of highway bridge pile foundation causes deformation of rock and soil medium. This physical deformation will form elastic waves in the stratigraphic structure and propagate in the medium to form seismic waves. The frequency of such "earth pulsation" caused by this excitation is a low-frequency vibration, and the received signal frequency band is lower, generally below 1kHz, and the high frequency components are attenuated during formation propagation, so it is generally called Microseismic [1]. With the development of geophysics, especially the application of digital seismic monitoring technology, it has provided the necessary technical basis for the study of microseismic in a small area with weak signals. 142 She Yanhua and Cai Gaojie: Experimental Study on Microseismic Monitoring Highway Bridge Pile Foundation Construction adjacent buried pipeline
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