富水岩溶隧道下穿充填型溶腔技术措施及力学分析
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U 455.49

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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)


Technical Measures and Mechanical Analysis of Filling Karst Cavity Through Tunnel in Water-rich Karst
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    摘要:

    为解决富水岩溶地区隧道下穿充填型溶腔时发生的突水涌泥灾害,以云南玉磨铁路巴罗二号隧道为背景。运用有限元软件MIDAS GTS NX建立充填型溶腔处治前后两种工况下的隧道模型,对两种工况进行力学分析,提出在充填溶腔位置采用超长管棚加固的方法对围岩变形进行控制,并通过现场试验段验证超长管棚加固效果。结果表明:在采用超长管棚加固后,溶腔与隧道间塑性贯通区消失,围岩竖向位移降低76.3%,左侧拱腰收敛降低63.85%,模拟值与现场实测值吻合度较高,证明采用超长管棚加固后隧道结构稳定性明显增强。超长管棚弯矩值和轴力值随开挖进度不断增大,但分布逐渐均匀,超长管棚应变解析解与软件模拟数值解分布规律基本一致,表明管棚在稳定围岩方面效果显著。现场试验段应用超长管棚加固措施后,围岩变形量值得到有效控制施工工期缩短,有效提高施工效率且效果良好,保证了后续施工的安全。

    Abstract:

    In order to solve the disaster of water inrush and mud gushing when the tunnel goes through the filling cavity in the water-rich karst area, the background is Baluo No. 2 tunnel of Yumo Railway in Yunnan province. The finite element software MIDAS GTS NX was used to establish the tunnel model under two working conditions before and after the treatment of the filling cavity, and the mechanical analysis of the two working conditions was carried out. The method of strengthening the surrounding rock with the ultra-long pipe roof at the filling cavity was proposed to control the surrounding rock deformation,and the reinforcement effect of the ultra-long pipe roof was verified by field test. The results show that after reinforced with ultra-long pipe roof, the vertical displacement of surrounding rock decreases by 76.3%, left arch waist convergence decreases by 63.85%. The simulated value is in good agreement with the actual measured value, which proves that the stability of the tunnel structure is obviously enhanced after the ultra-long pipe roof was used. The bending moment value and axial force value of the ultra-long pipe roof keep increasing with the excavation progress, but the distribution is gradually uniform. The strain analysis solution of the ultra-long pipe roof is basically consistent with the numerical solution of the software simulation, which indicates the effect of the pipe roof in stabilizing the surrounding rock significantly. After the application of ultra-long pipe roof reinforcement measures in the field test section, the deformation value of the surrounding rock is effectively controlled. The construction period is shortened, the construction efficiency is effectively improved and the effect is great, and the safety of subsequent construction is ensured.

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周晓松,陈浩然,王岑真,等. 富水岩溶隧道下穿充填型溶腔技术措施及力学分析[J]. 科学技术与工程, 2022, 22(23): 10262-10270.
Zhou Xiaosong, Chen Haoran, Wang Cenzhen, et al. Technical Measures and Mechanical Analysis of Filling Karst Cavity Through Tunnel in Water-rich Karst[J]. Science Technology and Engineering,2022,22(23):10262-10270.

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  • 收稿日期:2021-12-07
  • 最后修改日期:2022-04-29
  • 录用日期:2022-04-04
  • 在线发布日期: 2022-09-06
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