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目前国内外利用旁孔透射波检测桩底深度的方法有多种,其理论依据尚须论证。应用轴对称有限元模型,对顶面激振的完整桩用旁孔透射波法检测进行了模拟。结果表明,首至P波时深关系图形中的下段直线须基于一定深度范围内的数据进行拟合,由其与上段直线的交点确定的桩底深度误差较大,须进行修正。验证了旁孔透射波法首至P波的时深关系基本遵从陈龙珠等提出的简化理论模型,所提出的两直线交点深度修正公式可给出合理的桩底深度,经现场试验进一步检验后值得予以推广应用。
At present, there are many kinds of methods to detect the depth of pile bottom with the side-hole transmission wave at home and abroad, and the theoretical basis still needs to be demonstrated. Axial symmetry finite element model is used to simulate the test of the top-excited intact piles by the method of the side-hole transmission wave method. The results show that the lower straight line in the graph of the first to the P-wave depth is to be fit based on the data in a certain depth range. The depth of the pile bottom determined by the intersection with the upper straight line is larger and needs to be corrected. The time-depth relationship between the first P-wave of the by-pass transmission wave method and the simplified theoretical model proposed by Chen et al. Is basically verified. The proposed formula for depth correction of the two straight line intersections gives a reasonable bottom depth. After field test, Worth to be promoted.