不同工法下风积沙隧道破坏形态的对比分析研究  

Research on the Failure Mode of Aeolian Sand Tunnel Under Different Excavation Methods

作　　者：刘罡[1] 白东锋[1] LIU Gang;BAI Dongfeng(CCCC First Highway Construction Co.,Ltd.,Xi’an,Shaanxi 710075,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710075

出　　处：《施工技术》2020年第S01期723-726,共4页Construction Technology

摘　　要：风积沙地层具有结构松散、黏聚力低、抗剪强度低、颗粒单一、无自稳力等特点,在外力作用下极易破碎和松散,在该地层开挖隧道极易引起围岩破损、坍塌。因此,风积沙地层中隧道通常会考虑特殊的施工方式和预加固措施。依托某风积沙隧道,通过颗粒流理论分别对无预加固措施下二台阶和CD法开后下风积沙隧道的围岩变形、破损状态,并通过对比围岩应力变化、变形形态得到两种工法下隧道破坏形式的区别。Aeolian sand strata with the characteristics of loose structure,single particle,low cohesion,low shear shear strength,no stabilizing force and easily broken under the external force must cause the breakage and collapse of surrounding rock when excavate a tunnel in such a formation.So,it’s necessary to consider some special construction methods and pre-reinforcement measures.Based on the Tuotu mountain Aeolian sand tunnel,the paper has analyzed the deformation and damage state of the Aeolian sand tunnel excavated by the two step method and CD method with no pre-reinforcement measure through the particle follow code.Meanwhile,the author summarized the difference of the tunnel failure mode by the comparison of stress variation and deformation form of surrounding rock in two different excavation ways.The paper could offer advice to choose a proper way to excavate an Aeolian sand tunnel.

关 键 词：风积沙隧道 颗粒离散元 破坏形态 

分 类 号：U457[建筑科学—桥梁与隧道工程]