隧道空洞灾害的复合式检测方法研究

Study on the Compound Detection Method of Tunnel Cavity Disasters

为了研究隧道空洞的存在对隧道承载特性的影响,易引起隧道坍塌、裂缝以及渗漏水等灾害,通过对三条基线周边收敛、围岩内部多点位移的数据分析,探讨了周边收敛、围岩多点位移指导隧道信息化施工的作用及有空洞出现时收敛曲线的变化规律;结果表明从曲线的变化可以研究空洞存在的可能性;利用探底雷达在有可能出现空洞的地方做现场试验,通过Matlab小波分析对雷达信号进行处理验证了这种可能性的存在,在初衬期间及时对隧道空洞进行治理,可避免在二衬或者营运时处理花费更大的代价.

Cavities in tunnels tend to result in cracks, leakage of water and even collapse. To Study the impact of tunnel cavities on the bearing behavior of the tunnel, we studied the roles of peripheral convergence and multi-point displacement of surrounding rock in tunnel informational construction, and change rules of convergent curves when cavity occurs, through analyzing convergence curves of three baselines as well as multi-point displacements of internal surrounding rock. The results show that it＇s possible to determine the existence of cavities according to the change of these curves. Detection radar is used to scan the surrounding rock in the places where there may be cavities determined by the change of convergent curves on site, and the existence possibility of cavities is also supported by the Matlab wavelet analysis of collected signals. The results can help to take timely measures to control tunnel cavities during the period of initial lining, and thus avoid higher cost in the second lining or operating time.