基于超声回弹综合法的公路隧道混凝土衬砌的强度检测

Strength test on concrete lining in highway tunnel based on synthetic method of ultrasonic rebound

通过分析现有规程《超声回弹综合法检测混凝土强度技术规程》(CECS02:88)对受测混凝土的要求与公路隧道混凝土衬砌在养护环境、应力分布和长龄期等方面的差异,提出应按围岩等级划分隧道衬砌类别,对不同类别的衬砌分别进行强度推定的原则,并在统一测强公式的基础上进行了多种型式的公式比较,优选出了能进行应力、养护环境和长龄期修正的三参数公式,该式精度高,能较准确地推定衬砌混凝土的强度。

The difference of the stress distribution, the curing environment and the long age between the concrete lining of highway tunnel and the applied qualification of synthetic method of ultrasonic rebound are analyzed, and a principle is put forward that the lining strength should be concluded according to the classification of the lining of highway tunnel, based on the grade of surrounding rock, A new formula for calculating lining strength is derived after the comparison of seven models, which could well consider the stress in lining, the long age and the curing environment of concrete.