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通过对广西钦州至崇左高速公路四方山隧道特大塌方的成因机制、形成过程的分析,结合该塌方段的实际地质和施工条件,阐述了公路隧道特大塌方综合处治技术和相关的防排水措施。监控结果表明:处治后塌方段拱顶下沉和周边收敛位移速度均满足公路隧道施工技术规范要求,整体处于稳定状态,说明所采取的综合处治技术措施是有效的,为隧道特大塌方的安全处治提拱了成功的实践经验。
Through the analysis of the formation mechanism and the forming process of the huge collapse of the Sifangshan Tunnel from Qinzhou to Chongzuo Expressway in Guangxi Province and the actual geology and construction conditions of the collapse section, the comprehensive treatment technology and the relevant drainage and drainage measures for the large tunnel collapse are elaborated. The monitoring results show that the vault sinking and surrounding convergence displacement velocity of the collapsed section meet the requirements of highway tunnel construction technology after the treatment, and are in a steady state as a whole, indicating that the comprehensive treatment technology measures taken are effective for the safe treatment of the large collapsed tunnel Tigong arch successful practical experience.