新木厂子一号隧道出口危岩整治设计

Treatment of Dangerous Rock at Muchangzi 1# Tunnnel Portal

研究目的:以襄渝线增建二线新木厂子一号隧道工程为背景,针对隧道洞口存在危岩落石、并横跨公路的桥隧相连复杂工程,提出可靠、安全、有效的设计方案。研究结论:结合本工程的地形地质特点,设计方案中将公路防护、边坡整治、桥台基础布局优化、隧道控制爆破以及洞口接长棚洞等措施综合考虑,确保了210国道行车及行人的安全,消除了今后铁路运营安全的隐患。对于类似工程的设计,应重视以下3点:(1)精心勘察。勘测阶段详细测量出公路、桥台与洞口的位置关系,道路等级、是否存在危岩落石情况以及危岩落石分布等资料;若公路上方岩体呈倒悬状,应详细测出倒悬断面,并于断面上标注节理发育情况。(2)设计方案应确保公路运营及行人安全。(3)设计方案应考虑铁路开通运营后危岩落石对铁路运营安全的影响。

Research purposes： This paper mainly studies the hazards of dangerous rock and its potential falling around the Muchangzi 1# Tunnnel portal where crosses the highway,and puts forward a reliable,safe and effective treatment scheme for the purposes of construction of Muchangzi 1# Tunnnel on the second railway line from Xiangfan to Chongqing.Research conclusions：According to the geological and terrain conditions,the treatment scheme includes the following measures together： highway protection,slope reinforcement,optimizing abutment foundation,blasting control and elongating the length of tunnel shed.These measures can ensure the safety of traveling vehicle and passengers on the 210# national highway,and eliminated the threat to the security of the railway operation in the future.So for the similar works,first of all,the careful survey should be done to define the relation between the locations of highway and the pier and the location of the tunnel portal,highway grade and falling situation of dangerous rock,distribution of dangerous rock.If the rock above the highway is of reverse suspension,the section of suspending rock should surveyed carefully and the joint development level should be marked on the section.Then,the treatment scheme should guarantee the safety of vehicle and people on the highway.Finally,the impact of the rock falling on the railway traffic should be considered in the treatment scheme.