Study On The Pile Resistance And The Optical Fiber Method Of The Jacked Pile Stress

The bearing capacity of pile is the most important among all its properties and wecan research the penetration mechanism and bearing capacity of pile better throughseparating the resistance along depth into the shaft friction and end-bearing capacity.The test of separating the frictional resistance and end-bearing capacity becomes thebottleneck restricting the research. And pile stress test is needed for the test ofseparating the frictional resistance and end-bearing capacity. This papercarries on a deeper study on the optical fiber stress test of jacked pile based ontheoretical analysis and combined with scene prototype test which provides foundationand basis for the new testing method. The main studies of this paper are as follows:（1）We study and analyse the advantages and deficiencies among the variousstatic pressure pile stress testing methods thoroughly. According to these deficiencies,we present the method of adopting optical fiber sensing technology FBG (quasidistributed) method in pile body stress testing including the fiber Bragg grating sensorinstallation and demodulation devices use which provides the method basis for thefollowing test.（2）The field test in the paper is based on the static pile engineering in fuyangHangzhou. We study the method of optical fiber stress test deeply through theengineering examples and show the practicality.（3）We successfully separate shaft resistance and end-bearing capacity throughthe analysis and collection of the six root test pile data and this lays a foundation forfurther study on the properties of the pile.（4）We do twin bridge static rod explore test and calculate the pile body stress inadjustment coefficient simulation way. We also make a comparison with the actualmeasurement of pile body stress results. The simulation results corresponds with theactual measure well and fitting results are ideal which indicates the accuracy of opticalfiber stress test.