【摘要】 介绍隆纳地方铁路山顶上隧道浅埋段塌方冒顶的处理施工。具体分析了塌方原因,结合实际情况采取了相应的处理措施:洞顶锚、网、喷防护,混凝土护拱封闭,分部台阶、短进尺、快支护施工通过塌方段等。更多还原

【Abstract】 This paper introduces the treatment for collapse and roof cave-in at shallow depth in the Longna Railway Tunnel ,and analyzes the causes for collapse. In the light of the practical conditions,measures are taken to treat the collapse. Methods of bolting, mesh placing and shot concrete are adopted. Concrete is used to protect and support arch and for closing. Excavation is carried out in benches, in short footage and during the collapse sections prompt protection and supporting are performed.更多还原