隧道初期支护整体下沉的处理

The Treatment of the Integral Sinking of Early Support Tunnels

辽宁省丹东至本溪高速公路下马塘隧道左线进口较大范围内位于浅埋黄粘土地段,含水量大、强度低,施工时又过于冒进,造成了已做好的约17m的初期支护整体下沉,地表出现了大面积塌陷事故。分析了事故产生的原因、整治方案的选择及主要施工工艺,为今后软弱土层地段的施工和事故处理提供一定的参考意见和经验。

The left route entrance in Xiamatang tunnel of the expressway from Dandong to Benxi in Liaoning province lies the shallow buried yello clay section over a fairly wide range. It has high water content and weak integral. To rashly advancing in construction causes the integral sinking of completive early support 17 metres long, collapse accidents over large areas have arisen on the earth's surface. The reasons of resulting in accidents, selection of control and main construction technique are mainly analyzed, which can proride a certain reference and experience for the future construction and treatment of accidents in weak soil layer sections.