公路隧道衬砌中超声回弹测强公式的修正

Revised Formulas of Strength Calculation in Synthetic Method of Ultrasonic Rebound for Concrete Lining of Road Tunnel

对超声回弹综合法的应用条件与隧道衬砌在应力分布、养护环境和长龄期等方面的差异性进行了分析,然后基于隧道衬砌的类别划分,对超声回弹综合法的统一测强公式进行了多种形式的修正研究,优选出了能进行应力、养护环境和长龄期修正的参数公式.该公式拟合精度高,能较准确地推定公路隧道混凝土衬砌的强度.

Difference of stress distribution, maintaining condition and crete lining of road tunnel and permitted qualification of synthetic long age between the conthod of ultrasonic rebound are analyzed, and a principle is put forward that the lining strength should be deduced according to the classification of the lining of road tunnel based on the grade of surrounding rock. A revised formula of three parameters for calculating lining strength is derived after the comparison of 7 formulas, which could well consider the stress in lining, the long age and the maintaining condition of lining concrete.