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滇西南地区软岩隧道洞口顺层仰坡滑移力学特性及加固措施

Mechanical Properties and Reinforcement Measures of Bedding Slope Slip at the Entrance of Soft Rock Tunnels in Southwestern Yunnan
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摘要 以滇西南地区玉磨铁路曼勒一号隧道洞口段为依托,针对顺层条件下软岩隧道洞口仰坡滑移破坏问题及相应加固措施进行研究,采用MIDAS GTS NX软件建立隧道洞口仰坡加固前后的三维模型进行模拟分析,依据加固前后洞口仰坡的力学特性提出“注浆锚索+框架梁”的加固措施.研究结果表明:在不影响隧道开挖的情况下水泥砂浆锚索沿顺层岩层法向插入地表注浆加固,可以降低隧道洞口及仰坡所受压应力,仰坡竖向位移最大减少14.26%,纵向位移最大减少43.57%,仰坡稳定性系数为2.1,该加固措施能够抵抗仰坡滑移,增强隧道洞口及仰坡稳定性.“注浆锚索+框架梁”顺层仰坡加固方案经现场施作后加固效果良好,可为相关工程提供参考. Based on the entrance section of Manle No.1 Tunnel of Yumo Railway in the southwest Yunnan,the sliding failure of soft rock tunnel entrance under bedding condition and the corresponding reinforcement measures were studied.MIDAS GTS NX software was used to establish the three-dimensional model of the tunnel entrance before and after reinforcement,based on the mechanical characteristics of the portal front slope before and after reinforcement,the reinforcement measures of combining grouting anchor cables and frame beams were proposed.The results show that under the condition of not affecting the excavation of the tunnel,the cement mortar anchor cable can be inserted into the ground surface along the bedding rock normal direction for grouting reinforcement,which can reduce the compressive stress at the tunnel portal and front slope.The vertical displacement of front slope reduced by 14.26%,and the longitudinal displacement of the front slope is reduced by 43.57%,the stability coefficient of the front slope is 2.1.This reinforcement measure can resist the sliding of the front slope and enhance the stability of the tunnel portal and front slope.The reinforcement measures of combining grouting anchor cables and frame beams has achieved good results after being implemented on site,which can provide a reference for related projects.
作者 千绍玉 刘家奇 张浩 陈浩然 李文杰 QIAN Shaoyu;LIU Jiaqi;ZHANG Hao;CHEN Haoran;LI Wenjie(The 3^(rd)Construction Company LTD.of China Railway Construction 15^(th)Corporation,Chengdu 610097,China;School of Civil Engineering and Arrchitecture,Henan University of Science and Technology,Henan Luoyang 471000,China)
出处 《河南大学学报(自然科学版)》 CAS 北大核心 2024年第1期110-117,共8页 Journal of Henan University:Natural Science
基金 国家自然科学基金资助项目(U1604135) 中铁十五局集团有限公司A类科研课题(2017A1) 河南省科技厅产学研合作项目(2015HNCXY011)
关键词 软岩隧道 顺层仰坡 滑移 稳定性 加固措施 soft rock tunnel bedding front slope slope slip slope stability reinforcement measures
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