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广梧高速公路石牙山隧道围岩地质情况十分复杂,在开挖施工中以物探方法作为日常预报手段,在十分必要的情况下提出实施少量超前探孔作为验证和控制风险的手段。在所使用的地球物理方法中,以TSP203plus为主,以探测围岩的整体块段情况及围岩级别;地质雷达为辅,探测局部强风化及破碎带。根据TSP探测所取得的纵波速度等有关参数,在方法上与地质雷达及宏观、微观地质进行结合,按照规范中围岩级别与对应纵波速度关系划分围岩级别,并根据不同岩性进行对比和研究,经开挖验证,与实际情况相符,提高了预报的准确率。
Geological conditions of the surrounding rock of Shisaishanshan Tunnel on Guangwu Expressway are very complex. Geophysical methods are used as daily forecasting means in excavation construction. It is proposed that a small amount of advanced exploration holes be used as a means to verify and control risks when it is absolutely necessary. Among the geophysical methods used, the TSP203plus is mainly used to detect the whole block of surrounding rock and the grade of surrounding rock; supplemented by the geologic radar, local strong weathering and broken belt are detected. Based on the parameters such as P-wave velocity obtained by TSP detection, the method is combined with GPR and macroscopic and micro-geology, and the surrounding rock level is divided according to the relation between surrounding rock mass and corresponding P-wave velocity in the specification and compared according to different lithologies Research, verified by excavation, in line with the actual situation, improve the accuracy of forecast.