Research On The Transient Surface Wave Test Technology Of The Bridge Pile Bearing Capacity

With the continuous improvement of the grade of our country highway, the bridge on the road especially built in the sixties or seventies,with low design load,has not adapted to the growing traffic demand, and the bridge detection and reinforcement work has been in full swing. The upper structure of the bridge detection technology is mature and convenient construction. However,the hidden engineering- pile foundation’s bearing force detection is complex relatively,especially when the pile foundation is under bridge structure system,the traditional detection methods are not applicable. In recent years, the transient surface wave technique has been developed rapidly, and the test of shear wave in different depth can be obtained by the analysis of the transient excitation signal. Transient surface wave technique can text pile surrounding soil shear wave velocity under the bridge conveniently,so as to provide the powerful theoretical support to the establishment of the model between pile lateral ultimate resistance and ultimate tip resistance and shear wave velocity.At present, the report of the systematic research on the application of the transient surface wave technology in the detection of the bearing capacity of the pile foundation under the bridge structure system has not been appeared at home and abroad. The project intends to through the establishment of the relationship model between pile lateral ultimate resistance and ultimate tip resistance and shear wave velocity,with the application of transient surface wave test technology on detection of bearing capacity of pile foundation,it is no doubt that it provides a new way for the confirm of the bearing capacity of pile foundation with important scientific value and theoretical value and using value.The mechanical properties of pile foundation and the test technique of pile surrounding soil shear wave velocity are analyzed on this paper mainly, and the analysis model of the detection of pile foundation bearing capacity by transient surface wave is established,including the models of the shear wave velocity and pile side friction and pile tip resistance mainly,and study the model,and the influence factors of the character of soil around pile on the analysis model are researched and analyzed,and obtain the relationship between the shear wave velocity and the pile bearing capacity,to complete the detective work. Combined with the practical engineering, having a research and analysis on the detection of pile foundation under the bridge structure system by transient surface wave technology,verifying the applied effectiveness of the technology.