摘要
设计了白鹤滩水电站复杂结构面组合块体边坡的比尺为1:200的大型三维动力模型试验,通过输入不同幅值的地震波,研究地震作用下块体位移时程的响应规律、残余变形的分布规律,揭示边坡块体的破坏模式,评判边坡块体的破坏类别和特征。试验结果表明,工程边坡块体在设计条件下的抗震稳定性较好;在地震超载过程中,残余变形首先发生于后缘裂隙,各超载工况残余变形量由两个三角部位向坡内逐渐减小,三角部位为地震作用下易首先破坏的区域;该边坡块体地震破坏模式为沿底面与侧面的双滑失稳破坏模式。由残余变形量变化过程及地震灾后统计成果分析得出工程边坡的破坏特征:残余变形量小于15 cm且初次出现较明显突变可作为抗震设计允许变形限值;残余变形量大于30 cm后位移突变加强,边坡块体即可能整体失稳。边坡锚固应注意加强块体后缘裂隙的抗拉能力和底面的抗剪能力。
A large-scale 1:200 three-dimensional dynamic model of the slope blocks combined with complex structural planes of Baihetan hydropower station was designed. By inputting seismic waves of different amplitudes, the responsive displacement time history and residual deformation distribution of the block under strong earthquake were studied. Residual deformation distribution reveals the failure mode of the slope block and the failure category and characteristics of the slope block were evaluated. The test results show that the seismic stability of engineering slope block was good under the design conditions. In the process of seismic overloads, the residual deformation occurred firstly in the trailing edge crack, and the residual deformation decreased gradually from the two triangular parts near the edge toward the inner slope. The triangular parts are the areas prone to failure first during earthquake. The seismic failure mode of the slope block is the double-slip failure along the bottom and side. Based on the residual deformation and statistical results after earthquake, the allowable design residual deformation should be less than 15 cm and the first obvious mutation. After the residual deformation of the engineering slope block exceeded 30 cm, the displacement mutation is strengthened, and the slope block may slide completely. Slope anchoring should pay attention to increase the tensile strength of trailing edge crack and the shear resistance of the bottom surface of block.
作者
张春生
赖道平
吴关叶
徐建荣
张伯艳
ZHANG Chun-sheng;LAI Dao-ping;WU Guan-ye;XU Jian-rong;ZHANG Bo-yan(PowerChina Huadong Engineering Corporation Limited,Hangzhou,Zhejiang 311122,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2019年第12期4620-4626,共7页
Rock and Soil Mechanics
基金
国家自然科学基金青年基金（No.51409265）~~
关键词
边坡块体
强震
破坏模式
破坏类别
振动台模型试验
slope block
strong earthquake
destruction mode
failure category
shaking table model test
