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针对公路隧道溶洞和孔洞的存在给围岩的稳定性控制带来不同程度的困难且围岩大变形极易发生而造成工程事故,采用探地雷达超前探测和监控量测,归纳分析隧道围岩大变形的异常特征,并进一步通过贵州省晴兴高速公路登攀隧道出口围岩大变形预警的工程实例进行验算,获得黔西南区强风化多孔玄武岩及下伏灰岩溶洞雷达图像特征:有充填物时反射波振幅在洞腔范围内衰减强烈,强弱相间;无充填物时反射波基本无衰减,存在中断、起伏和错动现象。围岩大变形监测以拱顶下沉为主,21d最大累计沉降值达到89.40mm,变形速率最大波动范围为14.66～0.64mm/d。应用此结论可以在围岩出现大变形时及时预警并采取控制措施,更好地为后续工程服务。
In view of the existence of cave and hole in highway tunnel brings about different degree of difficulty to the stability control of surrounding rock and the large deformation of surrounding rock can easily occur, which causes the engineering accident. By using advanced detection of ground penetrating radar and monitoring and measuring, induction and analysis of tunnel surrounding rock Large deformation anomalous characteristics, and further through the Qing Xing Expressway in Guizhou Province Deng climbing tunnel exit large deformation early warning project instance to check, weighed in southwestern Guizhou strong weathered porous basalt and underlying limestone cave radar image features: with filling When the amplitude of the reflected wave decays strongly in the cavities, there is no attenuation of the reflected wave when there is no filling, and the phenomena of interruption, fluctuation and dislocation are observed. The main deformation of the surrounding rock is dominated by vault settlement. The maximum accumulated sedimentation value reaches 89.40mm at 21d and the maximum fluctuation range of deformation rate is 14.66 ~ 0.64mm / d. This conclusion can be used to timely warning and take control measures when large deformation of surrounding rock occurs, so as to better serve the subsequent projects.