瞬态面波法在隧道仰拱质量检测中的应用研究

摘要

瞬态面波法作为一种较高精度的无损探测方法,已在浅层勘探中得到了广泛应用,但在工程混凝土质量检测中应用较少.为此,通过分析瞬态面波法的理论基础、频散特性,结合环境特点及检测技术要求,设计合理的探测参数和激震方式,将其推广应用于隧道仰拱质量检测中.并以达万高速公路沙坝湾隧道检测为例,检测结果与钻孔取芯结果吻合性较好,有效地探查异常不密实地层空间位置及规模.结果表明,该方法应用于隧道仰拱质量检测,取得了良好的效果,为确保施工质量提供有效依据.%Transient surface wave method,as a high-accuracy NDT method,has been widely used in shallow exploration,but seldom used in quality inspection of concrete engineering.Thus the theoretical basis of transient surface wave method and the dispersion property were analyzed hereto and,in combination with the environmental characteristics and the inspection requirements,the proper prospecting parameters and source excitation style were designed so as to popularize this method to the quality inspection of tunnel invert.Taking the inspection of Shabawan Tunnel on Dazhou—Wanzhou Highway as an example herein,the inspection result is consistent with the result of core-drilling,thus the abnormal spacial position and scale of uncompacted stratum was discovered.The result shows that this method,when applied to quality inspection of tunnel invert,may get good effect and offer effective basis to ensure the construction quality.