不同位置空洞条件下隧道的破坏模式试验研究

隧道空洞是影响隧道稳定性的重要原因之一，因此开展了空洞在拱肩、边墙、拱脚及拱底等位置的模型试验，总结出存在不同位置的空洞隧道的破坏形式和破坏顺序.试验结果表明:拱肩空洞模型在空洞的边界位置和拱脚处现受压破坏，底板出现开裂；边墙空洞模型在空洞位置相应的衬砌出现压溃及拱顶产生开裂；拱脚空洞模型是拱脚位置衬砌受压破坏以及拱顶产生开裂；底部空洞模型是在底板衬砌位置及相应拱肩衬砌受压破坏以及拱顶出现开裂，研究结果为隧道的顺利施工和后期维护提供参考依据.

Experimental Study on Failure Mode of Tunnel Model Containing Cavity in Different Locations

Cavity is an important factor affecting the stability of the tunnel. A cavity was set at the shoulder， the side wall， the arch and the floor of each tunnel model to study the failure modes and failure sequences of the tunnel. The results showed that when the cavity is near the shoulder of the tunnel， failure occurs at the boundary of the cavity and the floor， accompanied by compressive failure at the arch foot. When the cavity is near the side wall， the side wall is buckled and the crown is cracked. For model with a cavity near the arch foot， the lining near the cavity and the crown are cracked as a consequence. For model with a cavity at the bottom of the floor， failure occurs at the floor， the shoulder and the crown. These results can give some references for the construction and maintenance of tunnel.