预裂爆破开挖对地下厂房岩锚梁的变形控制研究  

Researches on Deformation Control of Rock Anchor Beam in Underground Plant by Pre-cracking Excavation

作　　者：罗肖 郑虹[2] 江权[2] 袁维 陈涛 Luo Xiao;Zheng Hong;Jiang Quan;Yuan Wei;Chen Tao(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Wuhan Institute of Geotechnics,Chinese Academy of Sciences,Wuhan 430000,China;Sichuan Huaneng Luding Hydropower Co.Ltd.,Ganzi Tibetan Autonomous Prefecture 626000,China)

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]中国科学院武汉岩土力学研究所,湖北武汉430000 [3]四川华能泸定水电有限公司,四川甘孜藏族自治州626000

出　　处：《石家庄铁道大学学报（自然科学版）》2023年第4期55-60,共6页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

基　　金：国家自然科学基金面上项目(51879261);河北省自然科学基金(E2021210128)。

摘　　要：当前地下洞室工程中开挖卸荷诱发的围岩失稳问题频发,岩锚梁岩台开挖后围岩变形对岩锚梁的结构安全起决定性作用。使用FLAC3D有限差分软件分析了预裂爆破施工对硬梁包水电站地下厂房岩锚梁的围岩变形控制效果。建立了预裂效应的准三维数值模拟计算模型,基于岩体劣化模型研究了各层开挖后岩锚梁岩台附近围岩位移的变化趋势,分析了第4层预裂孔爆破施工工序对岩锚梁岩台变形影响。结果显示,提前预裂可减小厂房第4层开挖对岩锚梁变形的影响约40%,论证了第4层预裂后再浇筑岩锚梁更有利于控制其变形。The instability of perimeter rocks induced by excavation and unloading is a frequent problem in current underground cavern projects.The deformation of perimeter rocks after the excavation of rock anchors beams plays a decisive role in the structural safety.The FLAC3D finite-difference software was used to analyze the control effect of pre-splitting blasting on the deformation of rock anchor beam perimeter rocks in the underground powerhouse of Yingliangbao power station.A quasi-three-dimensional numerical simulation model of pre-splitting effect was established.Based on the rock mass deterioration model,the displacement variation trend of perimeter rocks near the rock anchor beam under stratified excavation was studied.And the influence of the pre-splitting hole blasting construction process on the deformation of rock anchor beam was analyzed.As the results show,the deformation of rock anchor beam caused by the excavation of the fourth floor of the powerhouse under pre-splitting is reduced by about 40%.And it is proved that pouring the rock anchor beam after pre-splitting in the fourth layer is more beneficial to control the deformation of rock anchor beam.

关 键 词：地下厂房 岩锚梁 预裂施工 开挖数值模拟 

分 类 号：TV52[水利工程—水利水电工程]