Research On Wave Detection Technology Of Super-long Pile Low Strain

The pile quality detection of common pile, commonly used at home and abroad of thelow strain reflected wave method, through the measurement of pile response curve ofacceleration or velocity, to determine the integrity of pile foundation. The integrity of thismethod can be used in the detection of pile body, the presumption of the defect type and thepile body about location, but also on the pile length check, the strength grade of concretepile to make a preliminary estimation. The method is simple, quick, low cost and the surveyof engineering, theory with the relatively perfect and advanced diagnostic technology.However, for the super long pile, the method is difficult to obtain the pile bottom reflectionor defect reflections from the depth is larger, even with a strong stick percussion wide pulsesignal, also not necessarily can measure reflected signal clear, resulting in poor accuracy, sothat the test results can not be fully complete and accurate. So, it is necessary to study themethod is rapid, efficient, saving, high precision, applicable to a wide range of a, my paperis used as the starting point of the study.First of all, for testing the quality of pile body comparison, analysis of low strainreflected wave method and traditional method in engineering application superioritycompared.Secondly, the low strain reflection wave method to pile soil pile interaction model,analysis of the key factors of the stress wave energy attenuation, the stress wave relaytransmission detection technology based on low strain method.Thirdly, through the model pile by low strain finite element simulation analysis, verifythe feasibility and superiority of this technique in super long pile detection applications.Finally, this chapter through the pouring pile model, the relay transmission method test,summarizes the detection before, and on-site installation, the late signal acquisition andsome practical experience, to lay the foundation for the application of this method furthersuccess, accurate to the actual project.