Building up the 3D numerical analysis and computing model, force properties of buried pipelines under vibration loads induced by bridge pile foundation construction were researched, to evaluate and control the influence of construction vibration on adjacent buried pipeline. It was concluded that the most adverse position of impact loads effect on pipeline appeared in the upper right and lower left parts of the pipeline closed to the side away from the pile hole about a quarter of an arc. And the peritubular stress distribution curve with the change of the vibration source location were approximately sinusoidal line, parabola and the cosine line changes. Another, under the same conditions, the vibration velocity of ground above the pipeline was significantly greater than the pipeline itself vibration velocity, so through a reasonable assessing and controlling the vibration velocity of ground above the pipeline, it could be made security decisions for buried pipelines. Finally, according to the horizontal spacing of the buried pipeline and shock vibration source, the pipeline grading protection measures were proposed, with achieving better results in engineering application. Research results could provide some evidence both for the force calculation and design construction of the pipeline project, and support for scientific decision-making of the bridge pile foundation construction. It has an important social and economic efficiency.
The simulation experiment of the vehicle action on pavement was carried on. In the progress of the experiment, HZ-MS48 microseismic monitoring system was used to collect microseismic waves. And these microseismic signals were disposed and analyzed. It introduced the scheme and the process of the data collecting experiment. After that, several types of microseismic waveform were compared and discussed. Also shock waves for transmitting characteristic in pavement base were studied. At the same time, taking a typical microseismic event location as a case, the precision of microseismic event location was confirmed, which put forward a new way for monitoring traffic vehicles.
By use of the microseismic monitoring system, the dynamic response of punched pile construction of bridge pile foundation is studied and discussed for the first time. Wave data of loads acting on the construction is group-collected by means of the microseismic experiment on site. Then the waveform, vibration frequency and energy of testing data are analyzed. On the basis of the results, the weaken rules of vibration acceleration and energy are studied, and the effect of impact energy on the vibration velocity is analyzed. It shows that impact energy attenuates exponentially with the distance from the epicentre. The conclusion establishes the theoretical basis for studying the vibrant characteristic of punched pile construction, and provides valuable reference for engineering practice to take effective measures to reduce construction vibration.
Impact loads caused by punching pile construction of highway bridges are bound to disturb stratum surrounding the buried pipeline adjacent to, which would adversely affect the normal use and safe operation of buried pipelines. Through developing field micro-seismic trial, the characteristics of vibration attenuation and sphere of influence were analyzed, in order to assess its impact on buried pipeline nearby. It drew conclusions that the amplitude of vibration energy had been enlarged with the presence of the pipeline; It should conduct the surface peak velocity above the pipeline as the main control index in routine vibration monitoring of pile foundation construction adjacent to buried pipeline; by positioning analysis of impacting vibration source, the rupture area of rock and soil around the pipeline caused by the vibration was determined, and security measures for pipeline protection was proposed. It provides a new method of control technology for pile foundation construction.
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