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分析了机场跑道重锤式弯沉仪、探地雷达、面波与映像的测试结果,判别了机场刚性道面板底部脱空、下部地基沉陷与地基空洞变形,对比了不同脱空深度和位置下的波谱特点,研究了基于应力波与电磁波的道面脱空测试方法的有效性与优越性,并对测试精度进行现场钻芯验证。验证结果表明:传统重锤式弯沉仪测试数据为道面表层荷载位移,无法反映跑道道面板底部土基沉陷变形与脱空缺陷;面波测试深度较大,采样数据可反映道面板下部地基变形与脱空状态;映像方法测试道面板底部反射波性状,可实现对道面板结构层底部脱空的判定;以上3种测试方法均为间隔采样,受采样点数目限制,对跑道整体状态代表性不足,无法克服由采样点间距导致的评价误差;探地雷达测试方法可实现连续状态测试,测试范围覆盖率为100%,且雷达测试数据与传统测试数据符合率为95%,并经8样本点钻芯试验验证孔底脱空测试精度为87.5%,但雷达测试结果对脱空的量化分析不足,需依托面波测试与映像测试结果对脱空测试结果进行有效验证。
The test results of hammer deflection, ground penetrating radar, surface wave and image at airport runway are analyzed. The results show that the bottom of the airport stiffening slab is empty, the settlement of the foundation and the deformation of foundation cavity are different. The validity and superiority of the test method for voidage of pavement based on stress wave and electromagnetic wave are studied, and the drilling core verification on the test accuracy is carried out. The results show that the test data of heavy hammer deflection instrument is the displacement of pavement surface, which can not reflect the deformation and void of soil foundation at the bottom of runway pavement panel. The surface wave test depth is larger and the sampling data can reflect the foundation Deformation and void state; Image method to test the reflection characteristics of the bottom of the pavement panel to determine the bottom of the Pavement structure layer void; The above three kinds of test methods are interval sampling, the number of sampling points, the overall status of the runway representatives Can not overcome the evaluation error caused by the spacing of sampling points; the GPR test method can achieve continuous state test, the test coverage is 100%, and the coincidence rate of the radar test data and the traditional test data is 95% The drill hole test at the sample point verifies that the hole bottom clearance test accuracy is 87.5%. However, the quantitative analysis of the void loss caused by the radar test results is insufficient. The surface void test and the image test results need to be validated to validate the results of the void test.