非贯通随机节理岩体的结构效应对地下洞室地震响应的影响

为研究非连通随机节理岩体的结构效应对地下洞室地震响应的影响，首先探讨了二维节理网络的生成原理，给出了结构效应影响的5个表征参数，即节理密度、节理倾角角度、节理倾角离散程度、节理迹长长度和节理迹长离散程度。以大岗山水电站主厂房洞室为背景工程，研究节理岩体结构效应对地下洞室地震响应的影响。结果表明，相同地震动水平下节理密度增加则洞室地震位移增加；节理角度在0°～80°范围内时，随节理倾角增加洞室的地震位移增加；节理离散程度较大时，随节理倾角离散程度减小洞室的地震位移减小，但当节理离散程度较小时则基本无影响；随节理迹长长度增加，洞室地震位移也增加；节理迹长的离散程度则对对洞室地震位移影响较小。结论可供节理岩体中地下洞室的抗震设计参考。

Structure effects of random joint network rock mass on seismic response of underground caverns

The structure effect of joint network rock mass on seismic response of underground cavern is studied. Based on the discussion of generating principle of two-dimensional joint network, five characterizing parameters, i. e. joint density, joint orientation and its discretization, joint trace length and its discretization, are identified. The powerhouse cavern of Dagangshan Hydropower Station is taken as a study case here. The results indicate that in the precondition of a same seismic level, seismic displacement increases with increasing the joint density. Seismic displacement also increases with the joint inclination increase at the range of 0°-80°. If the discretization of joint inclination is considerable, the seismic displacement is of positive correlation with joint inclination discretization, yet if the discretization of joint inclination is comparatively small, this correlation is ignorable. Seismic displacement increases with increasing the joint trace length increase. At last, little relationship between joint trace length discretization and seismic displacement has been found. Those findings may provide certain reference for the aseismic design of the underground caverns.