高土石坝坝坡地震稳定分析研究

徐 斌; 邹德高; 孔宪京; 董光辉

高土石坝坝坡地震稳定分析研究 English Version

徐斌^1,2,
邹德高^1,2,,
孔宪京^1,2,
董光辉¹

1. 大连理工大学海岸和近海工程国家重点试验室，辽宁大连 116024 ； 2. 大连理工大学水利工程学院，辽宁大连 116024

基金项目: 国家自然科学基金动力灾变重大研究计划项目（90815024）；国家自然科学基金项目（51121005，51138001，50908032）；中央高校基本科研业务费专项资金（DUT10ZD101，DUT11ZD110）

详细信息

作者简介:
徐斌( 1981 – ) ，男，博士，主要从事土动力学与高土石坝抗震、粗粒土力学特性等方面的研究工作。

中图分类号: TV641
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出版历程
- 收稿日期: 2010-11-10
- 发布日期: 2012-01-19

Seismic stability of slopes of high rockfill dams

1. The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China; 2. School of Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China ）

摘要

摘要: 采用有限元动力时程稳定和变形分析方法，对不同高度大坝坝坡稳定进行分析，开展了最危险滑弧确定方法、地震动持时对稳定和变形的影响、滑弧位置和深度以及坝坡加固范围的研究。结果表明：拟静力法采用规范建议的加速度分布系数不能反映高土石坝实际地震反应规律，计算得到的最危险滑弧较深且滑动范围偏大，不利于确定坝坡的加固范围；坝坡在地震过程中，最小安全系数与最大滑动量对应的滑弧并不一致且是不断变化的，有限元动力法计算坝坡稳定时，应在每一时刻任意搜索最危险滑弧；地震持时对坝坡安全系数影响不大，但对滑动量有较大影响；不同滑弧深度对坝坡安全系数有较大影响，存在一个临界深度，当滑弧超过临界深度时，坝坡安全系数大于 1.0 ；坝坡稳定安全性评价需要综合考虑安全系数与变形的计算结果。根据计算结果，建议了坝坡加固的范围。
- 高土石坝 /
- 坝坡稳定 /
- 拟静力法 /
- 有限元动力法 /
- 加固范围
Abstract: By using the dynamic finite element stability and deformation method, the definite methods for the most dangerous sliding surface, the influences of seismic duration and depth of sliding surface on slope stability and deformation as well as the reinforcement range of dam slopes are studied. The results show that by means of the pseudo-static method, the slip circle corresponding to the minimum safety factor is deeper and the slip range is larger owing to the fact that the acceleration distribution coefficient suggested by the Chinese Code does not match the seismic response of dams. It is not helpful for determining the reinforcement range of dam slopes. During the earthquake history, the potential sliding surface varies with the time history, and it should be arbitrarily searched by using the dynamic finite element method. The potential sliding surface corresponding to the minimum safety factor is different from the maximum slippage. The estimation of the stability safety of dam slopes should combine the safety factor with the deformation. The reinforcement range of dam slopes is suggested according to the calculated results.
- high rockfill dam /
- slope stability /
- pseudo-static method /
- dynamic finite element method /
- reinforcement range

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参考文献(15)

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