软弱泥岩隧道底鼓灾害机理研究与控制技术  

On Mechanism and Control Technology of Drum Disaster in Soft Mudstone Tunnel

作　　者：隋毅 王卫军 袁超 范磊 SUI Yi;WANG Weijun;YUAN Chao;FAN Lei(School of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201

出　　处：《矿业工程研究》2022年第1期24-30,共7页Mineral Engineering Research

基　　金：国家自然科学基金资助项目(52074115)。

摘　　要：针对某高铁隧道3#横洞内出现的底板隆起现象,通过理论分析、数值模拟以及现场试验的方法,分析隧道底板隆起的成因以及变形规律,并针对性地提出控制底板变形的合理方案.研究结果表明:(1)地下水的侵蚀作用致使基底软弱泥岩体出现较大范围的崩解、泥化现象,底板承载能力随岩体强度的骤然降低而大幅度减弱;弱化后的岩体在上覆岩层压力和远场构造应力的叠加作用下被“挤入”隧道净空是产生隆起变形的主要影响因素;(2)采用以“基底帷幕注浆”为主导、“锁脚锚杆+底板锚索+网喷+仰拱钢筋混凝土”为辅助的联合支护技术,使基底岩层承载能力显著提高,能够有效地限制围岩塑性区的发展,控制围岩变形量,保障隧道后期的正常使用.Aiming at the phenomenon of floor heave in 3#transverse tunnel of a high-speed railway tunnel,the causes and deformation law of tunnel floor heave are analyzed by theoretical analysis,numerical simulation and field test,and the reasonable scheme for controlling floor deformation is put forward.The Results show that:(1)The erosion of groundwater causes a wide range of disintegration and argillization of the weak mud rock mass on the basement,and the bearing capacity of the bottom plate decreases greatly with the sudden decrease of the rock mass strength.Under the superposition of overlying strata pressure and far-field tectonic stress,the weakened rock mass is“squeezed into”tunnel clearance,which is the main influencing factor of uplift deformation.(2)The combined support technology dominated by“basement curtain grouting”and assisted by“locking anchor rod+bottom anchor cable+web shotcrete+adding inverted arch reinforced concrete”can significantly improve the bearing capacity of basement rock,effectively limit the development of plastic zone of surrounding rock,control the deformation of surrounding rock,and ensure the normal use of tunnel in the later stage.

关 键 词：底板隆起 软弱泥岩 基底帷幕注浆 承载能力 

分 类 号：TU921[建筑科学—建筑设计及理论]