摘要
利用FLAC^3D初步分析了地震荷载作用下地震波振幅、频率及持续时间对地下岩体洞室位移特征的影响。分析结果表明，在地震荷载作用下，洞室位移随振幅以及持续时间的增大而增大，但随着频率的增大而减小，变化幅度随埋深和侧压系数的增加而减小。分析结果还表明，浅埋情况下，可能存在导致岩体洞室变形破坏的地震烈度门槛值，当地震烈度超过门槛值时，洞室位移值随振幅的增大呈陡变性增加趋势；同时，地震的长周期（低频率）特征对洞室的位移影响显著。低频地震波导致的洞室位移幅值明显高于高频地震波。
The influences of earthquake amplitudes, frequency and duration time on the different rock cavern displacements are primarily studied by using FLAC^3D. It is found that the displacements of rock cavern clearly increase with the increasing earthquake amplitudes and duration time as well as the decreasing frequency. The changing rates of displacements with the above earthquake parameters decrease with the increasing overburden and in-situ lateral coefficient （2）. It is also indicated that under shallow overburden, the threshold earthquake intensity probably exists. When the earthquake intensity reaches up to the threshold value, the cavern displacements significantly increase with the increasing earthquake amplitudes. In addition, it is revealed that the low frequency properties of earthquake have clear influence on the cavern displacement, and the cavern displacement under earthquake with low frequency is obviously larger than that at high frequency.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第A01期4627-4634,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金委员会和中国长江三峡工程开发总公司联合资助基金重点项目（50439030）：国家重点基础研究发展规划（973）项目（2002CB412705）
关键词
岩石力学
地震
地震振幅
地震频率
地震持时
洞室位移
rock mechanics, earthquake
earthquake amplitude, earthquake frequency
earthquake duration time
cavern displacement
