大跨度地下厂房顶拱层支护时机数值模拟研究  

Numerical Simulation Research on Support Opportunity for Top Arch Layer of Large-span Underground Powerhouse

作　　者：孟真 苏超[1] 付东 李硕[1] MENG Zhen;SU Chao;FU Dong;Li Shuo(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7期58-63,共6页Water Power

基　　金：国家自然科学基金资助项目(51579089)。

摘　　要：为研究初期支护不同施作时间对围岩稳定性的影响,以某抽水蓄能电站地下厂房为例,建立三维有限元分析模型,基于岩石材料非线性本构关系,以掌子面与分析断面的距离为控制变量,对比分析不同支护方案下厂房顶拱层的围岩位移、应力及塑性区情况。结果表明,支护时间越滞后,围岩变形及塑性应变越大,衬砌和锚杆承受的荷载越小;支护过迟,则不利于控制围岩变形和充分发挥初期支护的作用。In order to study the effect of different supporting time of primary support on the stability of surrounding rock, taking the underground powerhouse of a pumped-storage power station as an example, a three-dimensional finite element analysis model is established. Based on the nonlinear constitutive relation of rock material and taking the distance between tunnel heading surface and the analysis section as the control variable, the displacement, stress and plastic zone of surrounding rock at top arch layer of the powerhouse under different support schemes are compared and analyzed. The results show that,(a) the later the support time is, the greater the deformation and plastic strain of the surrounding rock, and the smaller the load on the lining and the bolt;and(b) if the support is too late, it is not conducive to control the deformation of surrounding rock and give full play to the role of initial support.

关 键 词：地下厂房 围岩稳定 支护时机 应变软化 非线性本构关系 数值模拟 

分 类 号：TU452[建筑科学—岩土工程]