基于围岩松动圈理论的炭质页岩隧道变形机理研究  

Study on Deformation Mechanism of Carbonaceous Shale Tunnel Based on Surrounding Rock Loose Circle Theory

作　　者：谭潘成 TAN Pancheng(China Railway 12th Bureau Group Co.Ltd.,Taiyuan Shanxi 030024,China)

机构地区：[1]中铁十二局集团有限公司,山西太原030024

出　　处：《铁道建筑技术》2023年第10期10-15,29,共7页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研究开发计划项目(2019-C08)。

摘　　要：在隧道施工和运营过程中,围岩变形始终是制约隧道安全稳定的重要问题,其中隧道围岩松动圈大小和形状对隧道稳定性和安全性具有重要影响。本文以张吉怀高速铁路邓家坡隧道为工程背景,对隧道围岩松动圈进行现场声波测试,建立松动圈弹塑性模型,并推导炭质页岩圆形隧道松动圈半径计算方程。基于该理论通过数值分析软件采用离散元模拟松动区域的松散岩体,其余岩体采用有限元单元模拟,组成离散粒子与连续体接触并相互作用的耦合模型。对比分析结果显示,隧道变形理论预测值与实际监测值在变形趋势和数值方面高度吻合,理论模型实用性和可靠性得到验证。In the process of tunnel construction and operation,the deformation of surrounding rock has always been an important problem restricting the safety and stability of tunnel,and the size and shape of the loose circle of surrounding rock have an important influence on the stability and safety of tunnel.With the engineering background of Dengjiapo Tunnel of Zhangjiajie-Jishou-Huaihua High-speed Railway,an elastic-plastic model of the loose circle of tunnel surrounding rock is established by in-situ acoustic wave test,and the equation for calculating the radius of the loose circle of carbonized shale circular tunnel is derived.Based on this theory,the loose rock mass within the loose range is simulated by discrete elements through numerical simulation software,and the rest of the rock mass is simulated by finite element elements to form a coupling model of contact and interaction between discrete particles and continuum.The calculated results are compared with the measured values,and the analysis results show that the theoretical predicted value of tunnel deformation and the actual monitored value are highly consistent in terms of deformation trend and value,and the practicability and reliability of the theoretical model are verified.

关 键 词：炭质页岩 隧道变形 松动圈 声波探测 解析公式 离散元 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]