摘要
为了解软岩空间发育位置对地下洞室开挖变形的影响,以某抽水蓄能电站为例,建立软岩层位于顶拱以上0、3、6、9、12 m和15 m等6种计算模型,采用Burgers-Mohr粘弹塑性本构模型,利用有限差分方法计算,分析不同软岩层空间分布下的地下洞室开挖变形特征。结果表明,软岩层与洞室顶拱间距越大,开挖过程中洞室顶拱产生位移量越小,且开挖完成后3个月产生的位移增量也随之减小;以位移及应力状态为评判依据,建议洞室顶拱与软岩层间距为12 m的布置方式。
In order to understand the influence of soft rock space development position on underground cavern excavation deformation,a pumped-storage power station is taken as an example,and six calculation models of 0,3,6,9,12 m and 15 m soft rock strata above the top arch are established.The Burgers-Mohr visco-elastic-plastic constitutive model is used to calculate the deformation characteristics of underground cavern excavation under different soft rock strata spatial distribution by finite difference method.The results show that the larger the spacing between the soft rock stratum and the vault of cavern is,the smaller the displacement of the vault of cavern is during the excavation process,and the increment of the displacement after three months of excavation is also reduced.Based on the displacement and stress state,it is suggested that the spacing between vault and soft rock is 12 m.
作者
王维平
孙宁
张发明
李梓楠
李云剑
侯晓岚
WANG Weiping;SUN Ning;ZHANG Faming;LI Zinan;LI Yunjian;HOU Xiaolan(School of Geosciences and Engineering,Hohai University,Nanjing 211100,Jiangsu,China;PowerChina Zhongnan Engineering Corporation Limited,Changsha 410014,Hunan,China)
出处
《水力发电》
CAS
2023年第2期35-41,共7页
Water Power
基金
国家自然科学青年基金项目(42102265)
中央高校基本科研业务费(2019B60414)
中国电力建设集团有限公司科技项目(DJ-ZDXM-2015-22)。
关键词
软岩
地下洞室
开挖变形
数值模拟
三维有限差分
粘弹塑性
流变特性
soft rock
underground cavern
excavation deformation
numerical simulation
3D finite difference
viscoelastic plasticity
rheological properties
