摘要
黔张常铁路高山隧道高位斜穿巨型溶洞,巨型溶洞体量大,整体稳定性较差,洞壁危岩分布较多,危岩向洞内位移,落石危险时有发生。为解决巨型溶洞处理带来的困难,降低安全风险,针对巨型溶洞提出线路绕避、回填处理和桥跨处理3类11个处理方案,在综合考虑施工、运营安全及经济性的基础上,选择回填处理方案,并最终确定“回填洞砟+上部注浆加固”的处理方案。施工中形成溶洞分阶段回填、洞壁洞顶锚网喷安全防护、回填体注浆加固、隧道明洞结构保护性施工和回填体工后沉降预处理等一系列关键施工技术。超厚回填体在线沉降监控和施工过程控制结果表明,溶洞处理施工顺利、处治方案技术可靠、成本经济,可为类似工程提供借鉴。
The Gaoshan Tunnel on Qianjiang-Zhangjiajie-Changde Railway obliquely passes through a giant karst cave at high level. The karst cave has super large size, poor overall stability, and many dangerous rocks distributed on the cave wall. Rock fallings caused by the displacement of dangerous rocks occur from time to time, which makes the treatment of the cave very difficult. Hence, 3 kinds of treatment schemes, i. e. line avoidance, backfill treatment and bridge span treatment, are put forward. Considering the factors such as construction, operation safety and economy, backfill treatment is selected, and the scheme of " backfill cave ballast + upper grouting reinforcement" is finally determined. During the construction, a series of key construction technologies, i. e. backfilling by stages, safety protection of bolt mesh spraying on the wall and roof of the cave, grouting reinforcement of backfills, protective construction of the structure of the tunnel and settlement pretreatment after construction of backfills, has been formed. The on-line settlement monitoring and construction process control of the super-thick backfills show that the process of cave treatment is smooth, the treatment technologies are feasible, and the cost is rational. The results can provide reference for similar project in the future.
作者
刘同江
唐钢
王军
孙亚飞
LIU Tongjiang;TANG Gang;WANG Jun;SUN Yafei(China Railway 14th Bureau Group Co.,Ltd.,Jinan 250101,Shandong,China;Qianzhangchang Railway Co.,Ltd.,Changsha 410008,Hunan,China;School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,Shandong,China;The 1S Engineering Co.,Ltd. of China Railway Urban Construction,Jinan 250101,Shandong,China)
出处
《隧道建设（中英文）》
北大核心
2019年第6期972-982,共11页
Tunnel Construction
基金
国家自然科学基金资助项目(51704176)
关键词
铁路隧道
巨型溶洞
溶洞稳定性评价
溶洞处理方案
railway tunnel
giant cave
stability evaluation of karst cave
karst cave treatment scheme
