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隧道穿越滑坡体失稳机理及处治技术

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针对隧道穿越大偏压、潜在滑坡体而造成隧道局部出现裂缝、变形等工程问题,文中以韶新高速公路寒山口大断面隧道为工程背景,通过现场调查和监控量测,研究隧道洞口及滑坡的变形情况,分析隧道洞口滑坡的诱发因素及形成机理,并提出有效的处治措施及监控技术.研究结果表明,隧道在穿越潜在滑坡体时发生较大的挤压变形(最大变形量为44.4cm,最大变形速率为30mm/d);洞口滑坡是由偏压地形、不利的工程地质、施工扰动、降雨等因素综合导致;通过采取裂缝封堵、洞身加强、坡脚加固的临时紧急措施和预应力锚索框架梁、洞内注浆、超小导管支护等综合处治措施,隧道及滑坡的变形得到有效控制.研究结果可为类似工程提供参考和借鉴.
INSTABILITY MECHANISM AND REMEDIATION TECHNOLOGY OF TUNNEL CROSSING LANDSLIDE MASS
Cracks and deformations in the local tunnel are often caused by the tunnel crossing the large bias pres-sure and potential landslide mass.Taking the large-section tunnel of Hanshankou of Shaoxin Expressway as the en-gineering background,the tunnel entrance and landslide are studied through on-site investigation and monitoring and measurement.According to the deformation of the tunnel,the inducing factors and formation mechanism of the landslide at the tunnel entrance are analyzed,and effective treatment measures and monitoring techniques are pro-posed.The results show that the tunnel has a large extrusion deformation when passing through the potential land-slide(the maximum deformation is 44.4 cm,the maximum deformation rate is 30 mm/d);the landslide at the en-trance of the tunnel is caused by the combined factors of bias terrain,unfavorable engineering geology,construction disturbance,rainfall and so on.The deformation of tunnel and landslide is effectively controlled by adopting tempo-rary emergency measures such as crack sealing,hole body strengthening,and slope foot reinforcement,as well as comprehensive treatment measures such as prestressed anchor cable frame beam,hole grouting and ultra-small pipe support.The research results may provide reference and reference for similar projects.

instability of landslide partylarge section tunneladvanced small pipe

孙志远

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中铁四局集团第六工程有限公司,西安 710086

滑坡体失稳 大断面隧道 超前小导管

2024

低温建筑技术
黑龙江省寒地建筑科学研究院

低温建筑技术

影响因子:0.237
ISSN:1001-6864
年,卷(期):2024.46(2)
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