基于灰关联理论的既有隧道衬砌背后空洞对衬砌受力的影响分析

Analysis of the Influence of the Cavity behind the Existing Tunnel Lining on the Lining Force Based on the Grey Relational Theory

衬砌背后空洞是既有隧道常见的病害,在衬砌发生严重损伤之前,很难发现空洞.因此,利用探地雷达对某既有隧道进行了无损检测,根据检测数据和设计资料建立了符合现场实际的数值模型.通过数值分析,研究了衬砌背后存在空洞时,在隧道埋深、空洞深度、空洞距二衬距离,二衬厚度四种不同影响因素下衬砌内力的变化规律,并对各影响因素进行了灰关联分析.结果表明:空洞的出现导致隧道衬砌产生附加轴力和弯矩,甚至改变了弯矩的正负性;影响衬砌附加轴力和弯矩的最主要因素是空洞深度.研究结果对后续隧道病害评价与治理及类似工程的设计提供参考.

The cavity behind the lining is a common disease of existing tunnels,which is difficult to find before the lining is seriously damaged.Therefore,the ground penetrating radar is used to carry out non-destructive testing on an existing tunnel,and a numerical model is established according to the testing data and design data.Through numerical analysis,the variation law of lining internal force under four different influencing factors,including the tunnel buried depth,the tunnel depth,the distance between the tunnel and the second lining and the thickness of the second lining is studied,and grey correlation analysis is carried out for each influencing factor.The results show that the appearance of voids causes additional axial forces and bending moments in the tunnel lining,and even changes the positive and negative properties of the bending moment;the cavity depth is the most important factor affecting the additional axial force and bending moment of lining.The research results provide references for subsequent tunnel disease treatment and the design of similar projects.