瓦斯隧道地震灾后重建施工技术

龙溪隧道地震后受损严重，地震后洞口埋深较浅段发生串珠式塌方；原二衬段落发生拱顶素砼大面积塌落；原二衬砼局部有掉块或剥落现象，有环向或纵向裂缝相连或贯穿整板二衬；原二衬受损较大，但整体受力结构尚未破坏；原施工仰拱段，在洞口浅埋段受到较大破坏，相对隆起高度达1 m左右；瓦斯积聚现象复杂。通过对以上现象的研究分析，提出了针对性的处治方案，施工结果表明,方案科学、合理。

Post earthquake Reconstruction Technology of Gas Tunnel

The Longxi Tunnel was heavily damaged by the earthquake. The moniliforme landslides occurred near the shallow depth of the tunnel front. Large area of the dome concrete in the former secondary lining collapsed. Exfoliation occurred on the surface of the former secondary lining concrete with the circumferential and longitudinal cracks cross linked. The former secondary lining was heavily damaged, but the overall structure was not yet been affected. The former inverted arch near the shallow depth of the tunnel front was heavily damaged with the relative uplift up to about 1 m. The gas accumulation in the tunnel was complex. By the analysis of the above situation, we put forward a specific treatment plan. The construction results show that the plan is scientific and rational.