黄土公路隧道病害分析与处治措施建议

针对新庄岭黄土公路隧道地表裂缝和衬砌开裂的病害特征,探讨了病害产生机理,并运用仿真、实测等手段详细分析了病害原因。分析表明:地表裂缝导致黄土浸水,从而使土体强度降低,变形增大,扩大了围岩塑性区范围和变形压力,恶化了衬砌结构受力状况,导致了衬砌结构局部出现裂缝。此外,根据隧道病害状况,提出了采用挖槽夯土法处治地表裂缝,采用环氧树脂嵌补及凿槽嵌入钢拱架法处治衬砌开裂的建议。研究结果为分析和处治黄土公路隧道病害提供了依据。

Disease Analysis for Highway Tunnel in Loess and Treatment Countermeasures

On the basis of the disease evolution of Xinzhuangling Highway Tunnel in loess,the disease reasons are analyzed through numerical simulation and field observation.The results show water infiltration results in the decrease of soil strength and the increase of soil deformation.Water infiltration results in the increase of rock plastic area and deformation press.Water infiltration results in the deterioration of mechanical characteristics on lining and the crevices of the lining.Besides,considering the actual disease of the tunnel,the earth's surface splits should be maintained by excavating loess and tamping,the lining splits should be maintained by resin and steel lattice girder implanting.The results provide theory for treating these diseases of highway tunnel in loess.