摘要
针对隧道浅层破坏,分析了传统支护措施对浅层破坏防护的不足,提出了按“有效超前支护+及时主动加固+减少扰动”的原则设计的经济合理的支护措施,可为浅层破坏的支护提供参考。研究表明:围岩浅层破坏是结构面切割的岩体在局部范围内未形成有效的传力体系,局部受拉使得不利结构面张开、错动并进一步发展,导致现场隐蔽性的、偶有延迟性的浅层掉块、剥落,是影响现场人员设备安全的主要隐患之一。针对浅层破坏,按“有效超前支护+及时主动加固+减少扰动”的支护原则进行防护,调整后新型支护措施可有效棚护浅层区域,且经济性较好。超前棚护可确保开挖后拱部安全,从而可调整施工工序,提前施工下一循环周边炮孔,进一步减小超挖。
In response to shallow tunnel damage,the shortcomings of traditional support measures in protecting against shallow damage were analyzed.An economically reasonable support measure designed based on the principle of“effective advanced support+timely active reinforcement+reduced disturbance”was proposed,which can provide reference for the support of shallow damage.Research has shown that shallow failure of surrounding rock is due to the failure of the rock mass cut by the structural plane to form an effective force transmission system within a local range.Local tension causes unfavorable structural planes to open,move and further develop,resulting in hidden and occasionally delayed shallow block and peeling on site,which is one of the main hidden dangers affecting the safety of on-site personnel and equipment.In response to shallow damage,the protection principle of“effective advanced support+timely active reinforcement+reduced disturbance”is followed for protection.After adjustment,the new support measures can effectively protect shallow areas and have good economic efficiency.Advance shed protection can ensure the safety of the arch after excavation,thereby adjusting the construction process and advancing the construction of the surrounding blast holes for the next cycle,further reducing over excavation.
作者
郭利民
GUO Limin(China Railway First Survey and Design Institute Group Co.Ltd.,Xi′an Shaanxi 710043,China)
出处
《铁道建筑技术》
2024年第5期79-82,共4页
Railway Construction Technology
基金
中国铁建股份有限公司重大专项(2019-A04)。
关键词
隧道
浅层破坏
超前支护
经济性分析
超挖
tunnel
shallow failure
advance support
economic analysis
over excavation
