摘要
巴基斯坦SK水电站地下厂房所在区域构造复杂,地震活动强烈,亟需研究其地震动力响应。采用有限元软件ABAQUS建立了三维计算模型,运用动力时程法分析了地下厂房的加速度、速度及应力响应特征,并研究了其抗震稳定性。结果表明:①地下厂房临空面存在明显的地震动放大效应,围岩质量越差,放大效应越明显。②在地震动过程中,地下厂房的应力状态主要受开挖完成后形成的原有应力场的影响。③在100年超越概率50%水平的地震动作用下,地下厂房整体基本处于稳定状态;在100年超越概率3.3%水平的地震动作用下,地下厂房整体稳定性受到较大影响。研究结果可为实际工程及相似工程提供参考。
There is a complex geological structure and well-developed seismic activity in at the underground powerhouse of SK Hydropower Station site in Pakistan,so it is urgent to study the seismic response of the underground structure.The three-dimensional numerical model was established by using the finite element software ABAQUS.The acceleration,velocity and stress response characteristics of the underground powerhouse were analyzed by using the dynamic time-history analysis method,and its seismic stability was also studied.The results show that:(1)There is an obvious seismic amplification effect on the free face of the underground powerhouse.The worse the quality of surrounding rock,the more obvious the amplification effect.(2)During the earthquake,the stress state of the underground powerhouse is mainly affected by the original stress field formed after excavation.(3)The underground powerhouse is basically in a stable state under the earthquake with an exceedance probability of 50%in 100 years;the stability of underground powerhouse may not meet the requirement under the earthquake with an exceedance probability of 3.3%in 100 years.The study results can provide a reference for the actual engineering and similar engineering.
作者
李毅
张宏山
LI Yi;ZHANG Hongshan(China Gezhouba Group No.3 Engineering Co.Ltd.,Xi'an 710000)
出处
《土工基础》
2023年第1期99-103,共5页
Soil Engineering and Foundation
关键词
地下厂房
地震动
动力时程法
动力响应
稳定性
Underground Powerhouse
Earthquake
Dynamic Time-History Analysis Method
Dynamic Response
Stability
