小浪底斜心墙堆石坝的地震反应分析

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英文篇名：Analysis of Earthquake Reaction in Xiaolangdi Declined-Core Earth and Rockfill Dam 中文刊名：人民黄河 英文刊名：YELLOW RIVER 作者：潘恕 ; 沈凤生 ; 杨宗茂 ; 耿晔 英文作者：Pan Shu et al. (Institute of Hydraulic Research. YRCC. Zhengzhou ; 450003)(36) 中文关键词：土石坝 ; 有效应力 ; 地震反应 ; 液化 ; 小浪底水库 英文关键词：earth and rock fill dam ; effective stress ; earthquake reaction ; liquefaction ; declined-coreearth and rock fill dam 出版日期：1994-08-20 机构：黄委会水科院 年：1994 期：08 出版单位：人民黄河

摘要

采用等价粘弹性动力有限元模型，结合有效应力法，对黄河小浪底斜心墙堆石坝最终设计断面在淤积后期受地震作用的动力特性进行了分析。分析时考虑了淤积土体内有未消散的超静孔丘。结果表明，坝体受里氏６．５级地震时，下游坝基及上游淤土表层均有一定范围的液化区，由于坝基液化区距坝体较远，因而只影响到坝趾压战的局部；当坝体受里氏８级地震时，坝趾下游近处的坝基砂砾石处于液化状态，上游库区淤土有较大范围的液化区，在上游反滤层中也有一定范围的液化区。
Employing the equivalent viscoelastic and dynamical model, together with the method of effective stress, we analyze the dynamical characteristics of the designed section of Xiaolangdi declined-core earth and rock fill dam caused by earthquake at the final stage of silt. Results showthat when the dam is subjected to earthquake of magnitude 6. 5 on the Richter scale. though liquified zones appear in the downstream dam foundation as well as upstream sediment layer. only aportion of the loaded area is affected at the dam site because the liquified zones are far from thedam, portion of the filter material was in the liquified state. when the dam is subjected to magnitude 8 earthquake, the entire sandy gravel of dam foundation downwtream from the dam site becomes liquified. Besides, the sediment layer and the filter material show regions of liquefaction.

引文

1沈凤生．杨宗茂，耿晔．小浪底斜心墙堆石坝的有效应力分析．人民黄河，1994，（5）．2沈珠江．计算土力学．上海：上海科学技术出版社，1990．