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隧道出洞前要对出洞口断面及其地质情况进行详细分析,按照“早进洞晚出洞,减少对整体扰动”的原则合理确定进洞位置,做好超前支护,存在偏压现象时及时施作反压挡墙,以确保洞口稳定。从地质情况、设计、施工等方面对瓦房沟隧道左线初期支护变形的原因作了简要分析,根据变形程度采取了相应的处治方法,对类似工程有一定的参考价值。
Before the tunnel goes out of the tunnel, it is necessary to conduct a detailed analysis on the section of the tunnel and its geological conditions and reasonably determine the location of the hole according to the principle of “early hole late hole, reducing the overall disturbance ”, make advance support, there is bias Phenomenon when the anti-pressure retaining wall in a timely manner to ensure the stability of the hole. The reasons for the deformation of the left line of the Wafanggou tunnel are analyzed briefly from the aspects of geological conditions, design and construction. The corresponding treatment methods are taken according to the degree of deformation, which has certain reference value for similar projects.