强震作用下某水电站高陡边坡的动力响应分析*

(1.大连大学 建筑工程学院,辽宁 大连 116622; 2.大连交通大学 土木与安全工程学院,辽宁 大连 116028)

高陡边坡; 动力分析; 地震荷载; 放大效应

Dynamic Response Analysis of High and Steep Slope of a Hydropower Station Under Strong Earthquake Action
XIANG Hongchun1,LI Yazhou2,WANG Zhongchang2

(1. College of Civil and Architectural Engineering,Dalian University,Dalian 116622,Liaoning,China)(2. College of Safety and Engineering,Dalian Jiaotong University,Dalian 116028,Liaoning,China)

high and steep slope; dynamic analysis; seismic load; amplification effect

备注

基于ANSYS软件,对地处地震高烈度区域的西南某水电站引水隧洞洞脸高陡边坡进行三维动力分析,研究高陡边坡在地震作用下的动力响应特征。结果 表明:在50年超越概率5%的罕遇地震荷载作用下,引水隧洞洞脸边坡对加速度的放大效应较对位移的放大效应更明显; 边坡表面在地震作用期间会产生瞬时拉应力; 坡顶开挖侧的地振动加速度较坡顶中央放大效应明显; 在高程为94.8 m处的古风化壳和页岩的露头面可能会发生顺层滑动和破坏; 边坡整体上可以经受住强震地震动的考验。

Based on the ANSYS software,we analyzed the 3D dynamic of high and steep slope of the diversion tunnel of a hydropower station which is located in the high earthquake intensity regions of Southwest China,and studied the dynamic response characteristics of the high and steep slope under seismic action. The result shows that:under the rare earthquake load with the exceedance probability of 10% in 50 years,the amplification effect of the tunnel-face side slope of the division tunnel on acceleration is more obvious than that of the displacement. The instantaneous tensile stress of the slope surface will be generated during the period of the earthquake,and the amplification effect of ground motion acceleration in the excavation side of slope crest is more obvious than that in the middle of slope crest. The ancient weathering crust and the outcrop of shale at the altitude of the 94.8 m may have a plane sliding failure. Overall,the slope can withstand the test of strong earthquakes.