高地应力软弱围岩变形控制方法

研究目的:探讨高地应力软弱围岩大变形的控制方法,并通过具体施工应用,进行现场监控量测试验验证。研究方法:结合乌鞘岭特长隧道最大断层---F7断层高地应力软弱围岩的地质特征及其变形特征,简要分析了支护临界失效点,围岩质量、允许变形量、变形速率和运输方式等与工序间距离的关系,具体从地质超前预报、隧道支护结构和施工方法三个方面进行探讨。研究结果:得出了高地应力软弱围岩围岩条件下,隧道施工支护参数与工序间距离确定的基本方法、一些经验参数和施工基本要求,并对施工中应注意的事项提出了建议措施。研究结论:在高地应力软弱围岩条件下进行施工,要根据掌子面围岩变化情况及时适当地调整支护参数和施工方法,才能有效地控制变形。

Exploration on Control Method for Deformation of Stressed Highland Weak Surrounding Rock

Research purposes: The purposes were to make exploration on control method for big deformation of stressed highland weak surrounding rock and to monitor,measure and demonstrate the method on site through concrete construction practice.Research methods:The brief analysis of distance relation between critical failure spot of support,quality of surrounding rock,allowable amount of deformation,deformation rate working procedure of transportation way was made according to the geological characteristics and its deformation characteristics of stressed highland weak surrounding rock at the largest fault P7 of Wushaoling Tunnel.Concretely speaking,the exploration was made on three aspects of geologic advance forecast,tunnel support structure and construction method.Research results:The basic method for defining the distance between support parameters and working procedure,experience parameters and basic requirement for tunnel construction were obtained under condition of stressed highland weak surrounding rock,and the suggestions and measures were put forward to the points for attention in tunnel construction.Research conclusions:The support parameters and construction method should be adjusted on time according to the changeable situation of surrounding rock on working face when construction was conducted under condition of stressed highland weak surrounding rock.In this way,the deformation could be controlled effectively.