旁孔透射波法检测既有建筑桩长的数值模拟研究
Numerical simulation study of pile length measurement of existing buildings by Parallel Seismic Testing
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摘要: 旁孔透射波法已广泛用于桩基长度和缺陷检测中，既有建筑物桩基在受荷环境下工作，旁孔透射波法对既有建筑物桩长检测的适用性研究不多，采用ABAQUS有限元软件进行旁孔透射波法检测既有桩基长度的数值试验，结合理论分析，研究了既有建筑荷载、桩长、旁孔深度、桩孔距等参数对旁孔透射检测响应特征的影响，确定不同条件下桩长检测误差修正方法的适用性。研究结果表明：当桩基处于线弹性工作阶段，上部荷载对旁孔透射波法确定桩长的检测影响可忽略，表明旁孔透射波法对既有建筑物下桩长检测适用性好，但在应用中应注意旁孔深度和桩孔距的影响；校正法在孔深充足时精度较高，误差在10%以内，交点平移法在桩孔距较小时误差较小，不超过11%，拐点法误差受孔深影响较小，精度较高，孔深不足时最大误差为7%，“交点法”误差通常较大，超过10%。Abstract: Parallel Seismic (PS) test has been widely used in pile length and defect detection.Existing pile foundations work in the loaded environment but the research on the applicability of pile length measurement by Parallel Seismic Test is still rare.The ABAQUS finite element model was carried out to test the length of existing pile foundation by Parallel Seismic (PS) test.Combined with theoretical analysis，the parameters of the existing building load，pile length，pile-to-borehole depth and pile-to-borehole distance by Parallel Seismic Test were studied.Then，the correction method of pile length detection error under different conditions were determined.The results show that when the pile foundation is in the linear elastic working stage，the influence of the upper load on the determination of pile length by the PS test method is negligible，indicating that PS test has good applicability to the test of the pile length of existing buildings.However，in the application，attention should be paid to the influence of the pile-to-borehole depth and pile-to-borehole distance.The "correction method" has a higher precision when the hole depth is sufficient，and the error is within 10%.，and the "intersection point translation method"has less error when the pile hole distance is small，no more than 11%.The error of the "inflection point method" is less affected by the hole depth，and the precision is higher.The maximum error is 7% when the hole depth is insufficient，and the "intersection method" error is usually larger，exceeding 10%.The research results can provide a theoretical reference for the application of the Parallel Seismic (PS)test in the test of pile foundations with existing buildings.
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