Deformation Law Analysis of Bedding Slope at Entrance of Highway Tunnel
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摘要: 隧道洞口段顺层边坡地质条件复杂，开挖施工易引发边、仰坡的变形。通过监测磨子坪隧道右线出口洞口段施工过程，总结坡体和隧道的变形规律，并评估加固措施的有效性。结果表明，上层土体与洞内围岩变形随着施工逐渐增大，所处断面开挖时监测点变形急增；上层土体、土–岩交界处位移明显大于基岩，有顺层滑坡风险，隧道拱肩与拱顶部位变形最大，需要加强支护；通过顺层边坡进入基岩段、洞口仰拱封闭后，坡体、隧道围岩变形逐渐趋于稳定。研究可为隧道洞口段顺层边坡开挖施工提供实践经验。Abstract: The geological conditions of the bedding slope at the entrance of the tunnel are complicated, and it is easy to cause the landslide deformation of the side slope and the inverted slope during excavation. The construction process of right line outlet section of Moziping tunnel was monitored, and the deformation characteristics of the lining and the failure mode of the slope were analyzed. The effectiveness of the reinforcement measures was also evaluated. The results show that the deformation of upper soil and surrounding rock in the tunnel increases gradually with the construction, and the deformation of monitoring points increases sharply during the excavation of the section. The displacement at the junction of upper soil and soil rock is obviously greater than that of bedrock, which has the risk of bedding landslide. The deformation of tunnel arch shoulder and arch crown is the largest, and the support needs to be strengthened. After the bedding slope enters the bedrock and the inverted arch is closed, the deformation of the slope and tunnel surrounding rock gradually tends to be stable. The study can provide practical experience for the slope excavation construction of tunnel portal section.
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Key words:
- highway tunnel portal /
- bedding slope /
- surrounding rock deformation
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