【摘要】 以国内罕见的大跨度超大断面浅埋偏压隧道——前欧隧道为工程背景,通过现场试验获得围岩变形数据,运用速率上限截断方法及小波理论对数据进行处理,并运用Ansys对开挖过程进行二维模拟,获得了一些变形规律:右上导坑的水平方向收敛计算值为18 mm,明显比其他2个方向值8.6 mm,3.8 mm大得多,而全断面水平方向收敛计算值7.9 mm与其他2个方向值4.5 mm,4.4 mm基本相同,均与实测值规律相同;右上导坑收敛曲线受开挖工序影响比较明显,呈现出明显的周期性,而全断面收敛曲线周期性不明显.更多还原

【Abstract】 On the engineering background of rare domestic large-span and super-large cross-section tunnel—Qianou tunnel,data of surrounding rock deformation was obtained through in-situ monitoring.Firstly,those data were cut off by upper limited velocity method;Then,they were analysed by Wavelet.Besides,a 2-D numerical model was set up by ANSYS to simulate the construction process.Some deformation laws were obtained as follows:The horizontal convergent calculated value of upper right heading was 18 mm,which was obviously much more than another two orientations,8.6 mm and 3.8 mm respectively.While,the horizontal convergent calculated value of whole section was 7.9 mm,which was approximately coincident with another two orientations,4.5 mm and 4.4 mm,respectively;The construction method had a comparatively more obviously influence on the convergent curve of upper right heading,which showed an obviously periodical character,while,the periodical character showed by the convergent curve of whole section was not that obvious.更多还原