BEHAVIOR OF LARGE SCALE UNDERGROUND CAVERN LOCATED IN JOINTED ROCK MASSES EVALUATED BY USING DISTINCT ELEMENT METHOD

SOILS AND FOUNDATIONS

YOSHIHIKO TANABASHI¹  YUJI YAMASHITA²  BO LI¹  YUJING JIANG¹ 

[1] Faculty of Engineering, Nagasaki University;Kyushu Electric Power Co., Inc.

关键词: deformation;    discontinuity;    distinct element method;    excavation;    measurement;    underground cavern;    (IGC: G2/G5/H5);   

DOI  :  10.3208/sandf.50.609

学科分类：建筑学

来源: Japanese Geotechnical Society / Jiban Kogakkai

【 摘 要 】

References(17)Cited-By(1)The stability and support effects of large-scale underground caverns located in jointed rock masses are principally ruled by the mechanical behavior of discontinuities. The major deformations of the host rock masses containing underground caverns originate from the normal and shear movements among the walls of discontinuities. Therefore, in the numerical simulations of the deformation behavior of underground structures, how to accurately model the discontinuities becomes a key problem. In this study, a 2-D distinct element code, UDEC, was used to analyze the deformation behavior of an underground cavern of a pumped storage power plant, based on in-situ geological data. The validity of numerical simulation was evaluated by comparing the numerical results with the site measurement data at two cross-sections of the cavern. Some local deformation behavior of the cavern affected by the characteristics of discontinuity distributions was discussed. The influences of cross-sectional shape of the cavern and the orientation of initial ground stress on the performance of cavern were evaluated. The simulation results revealed that the orientation, position and density of discontinuities as well as the cross-sectional shape of a carven influence its deformation behavior and stability significantly.

【 授权许可】

Unknown