1.0.1 This code is formulated with view to implementing national technical and economic policies during foundation pile testing, realizing safety and usability, advanced technology, exact data and correct assessment, and providing reliable criterion for design, construction and acceptance.
1.0.2 This Code is applicable to the testing and assessment of the bearing capacity and pi1e integrity of the building foundation pile.
1.0.3 The testing method of foundation pile shall be reasonably selected and the testing result shall be correctly judged according to the characteristics and application scope of each testing method in combination with geologic conditions, pile type, construction reliability and operating requirements.
1.0.4 In addition to the requirements stipulated in this code, those stipulated in the current relevant standards of the state shall also be complied with.
2 Terminologies and Symbols
2.1 Terminologies
2.1.1 Foundation pile
The single pile in the pile foundation.
2.1.2 Pile integrity
The comprehensive quantitative indexes reflecting the relative dimension variation in pile shaft section and the compactness and continuity of pile shaft materials.
2.1.3 Pile defects
Poor phenomena such as pile rapture, crack, necking, mud intercalation (foreign substance), hollowness, honeycomb and looseness that deteriorate the pi1e integrity and reduce the strength and durability of pile structure.
2.1.4 Static load test
Test methods conducted as follows: exert vertical pressure, vertical uplift force or horizontal thrust to the top of the pile by steps, observe the settlement, uplift displacement or horizontal displacement of the pile top with the passage of time, so as to determine the corresponding vertical bearing capacity, vertical uplift bearing capacity and horizontal bearing capacity of the single pile.
2.1.5 Core drilling method
The method to determine the pile-tip rock soil property through testing the pile length, pile defect, pile-bottom sediment thickness and the pile concrete strength with the drilled core sample.
2.1.6 Low-strain integrity testing
The testing method adopted to determine the pi1e integrity: exerting shock excitation at the pile top through the low-energy transient state or steady state mode so as to measure the speed-time curve, or simultaneously measure the speed-time curve and the force-time curve at the pile top; adopting the time domain analysis or frequency domain analysis of wave theory.
2.1.7 High-strain dynamic testing
The testing method adopted to determine the vertical bearing capacity and integrity of single pile: impacting the pile top with a heavy hammer, measuring the speed-force-time curve at or near the pile top and then analyzing with the wave theory.
2.1.8 Cross-hole sonic logging
The method adopted to test the pi1e integrity: emitting and receiving sonic wave between the embedded sounding pipes and then measuring the relative variation in such acoustics parameters as phonation time, frequency and amplitude attenuation when the sonic wave travels in the concrete.
2.1.9 Internal force testing of pile shaft
The testing method to calculate the pile side resistance, pile tip resistance or pile shaft bending moment under load action through testing the pile strain and displacement.
2.2 Symbols
2.2.1 Resistance and material performance
c - the transmission speed of one-dimensional longitudinal stress wave of pile shaft (hereinafter referred to as pile shaft wave speed);
