狭窄河谷陡边坡高面板堆石坝应力变形研究  

Study of Stress and Deformation of High Concrete-Face Rockfill Dam on Steep Slope in Narrow Valley

作　　者：侯冰铃 聂柏松 HOU Bingling;NIE Baisong(Hangzhou Yuhang District Forestry Water Conservancy Investment Co.,Ltd.,Hangzhou 310000,China;Power China Huadong Engineering Corporation Limited,Hangzhou 310000,China)

机构地区：[1]杭州余杭林业水利投资有限公司,浙江杭州310000 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州310000

出　　处：《人民珠江》2022年第4期127-134,共8页Pearl River

摘　　要：目前堆石坝有限元应力应变计算大多采用固支模拟岸坡处堆石与岸坡的连接。对于狭窄河谷陡边坡地区面板堆石坝,堆石可能沿岸坡面将发生滑移,此时采用固支模拟与实际情况不符。为研究狭窄河谷陡边坡对面板堆石坝应力变形影响,选用无厚度的goodman单元模拟狭窄河谷中陡边坡边界与堆石的接触面,并与将岸坡处堆石的结点按固支模拟的常规方法的成果相比较。计算结果表明:2种情况下堆石体变形及应力分布规律大体一致,但是采用固支处理时变形值相对较小;采用固支时,河床段面板底部拉应力偏大,与实际情况不符,考虑摩擦接触后,堆石能够沿着岸坡滑动,该部位应力较为均匀,拱效应相对降低,蓄水后岸坡处面板在受静水压力作用,有较小的压应力,符合实际情况。At present,in the finite-element stress and strain calculation of rockfill dams,fixed support is mostly adopted to simulate the connection between the rockfill at the bank slope and the slope.As for a concrete-face rockfill dam(CFRD)in the steep slope area of a narrow valley,the rockfill may slip along the bank slope face,in which case fixed support simulation is inconsistent with the actual situation.To study the influence of the steep slope in a narrow valley on the stress and deformation of a CFRD,we adopt the thickness-free Goodman element to simulate the interface between the steep slope boundary and the rockfill in a narrow valley.The results are compared with those of the conventional method of simulating the rockfill nodes at the bank slope as fixed support.The calculation results show that the deformation and stress distribution of the rockfill body are similar in the two cases,although the deformation is relatively smaller when fixed support treatment is implemented.Moreover,the tensile stress at the bottom of the concrete face in the riverbed section is large in the case of fixed support,which disagrees with the practical situation.After frictional contact is considered,the rockfill can slide along the bank slope,the stress distribution in this area tends to be uniform,and the arch effect is minor.After impoundment,the concrete face at the bank slope is slightly compressed under the action of the hydrostatic pressure,which is in line with the actual situation.

关 键 词：狭窄河谷 陡边坡 面板堆石坝 滑移 

分 类 号：TV641[水利工程—水利水电工程]