关键词: 波动理论, 桩基检测, 旁孔透射波法, 桩土相互作用

Abstract: With the continuous development of China's construction industry, the number of pile foundations used in the construction process of infrastructure projects is very large. The construction quality of the pile foundations is also very important, which directly affects the safety and stability of the overall building structure. For building construction, once the construction is completed, the pile foundation will become a hidden underground object, which cannot be directly tested for their integrity. Therefore, the quality inspection of the pile foundation is an important index to measure the safety and stability of buildings. In this paper, the quality of pile foundation is evaluated based on the detection principle of transmission wave method of side borehole, and the factors that may affect the wave velocity in the pile are analyzed. It can be concluded that changing the radius of soil around the pile by reflection wave method has little effect on the analytical result of the wave velocity. The wave velocity distribution of the pile measuring point is evaluated as inverted V shape by Δx/Δt method. For different pile lengths, the wave velocity distribution at measuring points of the pile shaft is calculated as V-shaped by reflection wave method. The change of the pile length by reflecting wave method has little effect on the analysis result of the wave velocity, and the velocity is basically unchanged. The wave velocity distribution of the pile measuring point is evaluated as inverted V shape by Δx/Δt method. Under the condition of the weak building contact, the changing the friction coefficient of pile and soil has little effect on the wave velocity in the pile, that is, with the change of the friction coefficient between the pile and the soil, the wave velocity in the pile changes little.

Key words: Wave Theory, Pile Integrity Testing, Side Borehole Transmission Wave Method, PileSoil Interaction