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在现场调研及隧道监控量测的基础上,研究了十堰至房县高速公路通省隧道施工中出现的大变形问题,通过分析该隧道大变形破坏的特点,从围岩岩性条件、工程结构受力和施工因素等方面对该隧道的大变形机制进行了研究。结果表明通省隧道发生大变形的主导因素是隧道所处的地质环境和软弱围岩,而施工开挖卸荷是产生大变形的诱因。结合研究成果提出针对大变形段的治理措施,监控量测结果表明该治理措施取得较好效果。
On the basis of on-the-spot investigation and tunnel monitoring measurement, this paper studies the large deformation in the construction of Tongyan Tunnel from Shiyan to Fangxian Expressway. Based on the analysis of the characteristics of large deformation and failure of the tunnel, from the lithological conditions of surrounding rock, Stress and construction factors and other aspects of the tunnel deformation mechanism was studied. The results show that the main factor causing the large deformation of the tunnel in the province is the geological environment and weak surrounding rock of the tunnel, and the unloading of construction excavation is the inducement of large deformation. Combined with the research results, the control measures for the large deformation section are put forward. The monitoring and measuring results show that the control measures have achieved good results.