The Research Of The High Strain Dynamic Testing Parameters For Foundation Pile

Pile foundation engineering is concealed engineering, the quality of it is directly to the safety of the entire structure, and pile the event of accident, reinforcement difficult to tackle. Therefore, the test for detection of pile foundation became an important aspect of the Pile. Foundation Engineering Foundation Quality is good or bad depends largely on two factors; namelyand the bearing capacity of pile quality, and bearing capacity of the main factors is both. Pile foundation bearing capacity test is in the field of engineering major issue.The main methods of the detection of ultimate bearing capacity of single pile are static load test and high strain dynamic testing. The procedure of dynamic test method is at the top of the pile or pile shaft to exert a dynamic force, through testing and analysis of pile dynamic response characteristics to determine the quality of the pile and speculated that the size of its bearing capacity, There are several key advantages for using dynamic testing method, the portability of the device, the detection speed, the lower costs etc, therefore it is widely available and adapted to the current construction industry and the needs of the pile quality inspection tasks is increasing. High Dynamic Test, although the method tends to be mature today, but imperfect, so made thorough research and analysis of this method, is helpful to improve the accuracy and reliability, it has higher practical value for application.This paper briefly describes the pile loading mechanism and the basic static load test method provide a theoretical basis for comparison with high-dynamic testing method, curve fitting between the CASE method.Secondly, this paper proceeds from the basic theory of high stain dynamic testing method, summarizes the basic theory of high stain dynamic testing method, which is one-dimensional wave theory. The total soil resistance formula of CASE method is re-derived, the CASE method is analyzed. Analyses and studies the curve fitting method, the principle and advantages of the curve fitting method are explained, introduction of high strain analysis of the existing problems and Solutions. Based on the Ji’nan city large pile static loading test, high strain curve fitting results and high strain CASE results contrast analysis, summed up the static method, high strain curve fitting method and high strain CASE method relations, identify Ji’nan city various pile type in various geological conditions and the reasonable range of damping coefficient.Again, with high strain detection of large diameter bored piles in the application.Through the large diameter bored piles of static and dynamic contrast, discuss high strain detection the feasibility of large diameter bored piles and how to improve the high strain detection of large diameter bored piles of the ultimate bearing capacity accuracy. Finally, the research direction in the future outlook and puts forward some Suggestions.