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公路涵洞段涵台背回填质量难以控制,是易出现构造物不均匀沉降,造成路基病害的重要区域。该文提出用多道瞬态瑞雷面波勘探技术对涵洞区段进行检测以及相应的方法,并且以云南昆明某高速一矩形涵洞通道为例进行了试验。试验结果表明:(1)多道瞬态瑞雷面波勘探技术在公路涵洞台背回填质量检测应用上是可行的;(2)通过试验再一次验证了面波在传递过程中,在局部地质体或者岩性突变界面(比如陡坎、直立坡、围墙、桩体等)会产生绕射现象,该现象有利于外业勘探中对地下异常的识别,从而提高勘探精度;(3)通过确定密度与横波速度和深度的关系公式,计算相应部位密度,可以得到该处密实度情况,达到了回填质量快速无损检测的目的。
It is difficult to control the quality of the culvert backfill in the culvert section of highway culverts, which is an important area prone to the uneven settlement of the structure and the roadbed disease. In this paper, multi-channel transient Rayleigh wave surface exploration technology to detect the culvert section and the corresponding method, and a high-speed rectangular tunnel in Kunming, Yunnan as an example tested. The experimental results show that: (1) Multi-channel instantaneous Rayleigh wave surface survey technology is feasible for the quality inspection of backfill of highway culverts; (2) The experiment verifies once again that in the process of transmission of surface waves, (Such as steep ridge, upright slope, wall, pile body, etc.) will produce diffraction phenomenon, which is beneficial to the identification of underground anomalies in field exploration and thus improve the exploration accuracy; (3) Density and shear wave velocity and depth of the formula, calculate the density of the corresponding parts, you can get the density of the situation, to achieve the purpose of fast nondestructive testing of backfill quality.