板岩区地下厂房洞室群围岩稳定性研究  

Study on Surrounding Rock Stability of Underground Powerhouse Cavern Group in Slate Area

作　　者：李雯静 任旭华[1] 张继勋[1] 魏鹏 LI Wenjing;REN Xuhua;ZHANG Jixun;WEI Peng(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,Jiangsu,China)

机构地区：[1]河海大学水利水电学院,江苏南京210024

出　　处：《水力发电》2022年第11期74-79,共6页Water Power

基　　金：国家自然科学重点基金资助项目(U1765204)。

摘　　要：为揭示围岩变形规律并选择合适的支护方式,以西南地区某大型地下洞室群为例,结合现场揭露的板岩地质条件,采用基于横观各向同性弹性模型和遍布节理塑性模型相结合的方法,研究板岩区地下厂房开挖支护过程中的围岩变形、应力变化及塑性区分布规律。结果表明,该方法能很好地体现板岩各向异性特性;洞室群在开挖完成后,厂房洞室板岩围岩区域相较于灰岩区域变形量较大,洞口交汇处及顶拱部位出现较大范围塑性区,需加强支护;初期支护施加之后,围岩位移变形量及应力集中现象整体减少,能在一定程度上抑制围岩变形。In order to reveal the deformation law of surrounding rock and select appropriate support method,a large underground cavern group in Southwest China is taken as the study example,and combined with the slate geological conditions revealed on site,the deformation,stress change and plastic zone distribution law of surrounding rock during the excavation and support of underground powerhouse in slate area are studied by using the method based on the transverse isotropic elastic model and the plastic model of joints.The results show that,(a)this method can well reflect the anisotropic characteristics of slate;(b)after the excavation of cavern group is completed,the deformation of slate surrounding rock area of the powerhouse cavern is larger than that of the limestone area,and a large range of plastic areas appear at the intersection of the portal and the top arch,so the support needs to be strengthened;and(c)after the initial support is applied,the displacement,deformation and stress concentration of surrounding rock are reduced as a whole,which can restrain the deformation of surrounding rock to a certain extent.

关 键 词：板岩 地下洞室群 围岩稳定 各向异性 支护措施 

分 类 号：TU457[建筑科学—岩土工程]