基于PFWD的路基压实质量快速检测方法研究

Research on Rapid Detection Method of Subgrade Compaction Quality Based on PFWD

摘要:

以公路路基压实质量控制和检测为背景，利用PFWD开展了路基压实质量快速检测的方法研究，并从人为操作、仪器设备、检测环境3个方面总结分析了测试误差来源。结果表明：PFWD方法具备良好的测试可重复性，各组测试结果的变异系数均小于0.1；基于PFWD的路基模量与弯沉呈幂函数负相关，与承载板反力呈指数函数正相关，故该方法能够有效地反映路基压实质量优劣和不均匀性；严格控制由落锤、承载板接触面处理、传感器标定、计算参数选取等因素引起的测试误差，有利于使该方法得到更广泛的应用。

Abstract:

Based on the background of highway subgrade compaction quality control and detection, PFWD is used to study the rapid detection method of subgrade compaction quality, and the sources of test errors are summarized and analyzed from three aspects of human operation, instrumentation and equipment, and testing environment. The results show that the PFWD method has good test repeatability, and the coefficients of variation for each set of testing results are below 0.1. The subgrade modulus based on PFWD is in negative correlation as a power function with deflection, while in positive correlation as an exponential function with bearding plate force. Thus, the method can effectively reflect the quality and non-uniformity of subgrade compaction. The test errors caused by drop hammer control, bearing plate contact surface processing, sensor calibration, and calculation parameter selection should be strictly controlled, which is helpful for the method to be applied more widely.