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在我国的铁路、公路等工程建设中,经常会遇到软弱围岩隧道。这类隧道进出口常处于浅埋偏压地段,隧道洞口浅埋地段横坡一般较陡、洞顶覆盖较薄,且多为软质或土质围岩,往往给设计、施工带来极大的困扰。本文结合现场施工和数值模拟分析了隧道洞口段施工过程中出现失稳破坏的原因,针对失稳破坏的原因提出了浅埋偏压软弱围岩地质段的施工对策,有效保证了该隧道施工的顺利进行。
In our country’s railway, highway and other engineering construction, we often encounter weak rock tunnel. Such tunnel entrance and exit are often in the shallow bias section, the shallow section of the tunnel entrance slope is generally steep, the roof is relatively thin, and mostly soft or soil surrounding rock, often to the design and construction of great Troubled Based on field construction and numerical simulation, this paper analyzes the reasons of instability failure during the construction of tunnel entrance section, and puts forward the construction countermeasures for the geologic section of shallow surrounding rock with soft surrounding rock in the light of the reasons of instability failure, and effectively ensures the construction of the tunnel Smooth progress.