考虑堆石料软化的坝坡随机地震动力稳定分析

孔宪京; 庞锐; 徐斌; 周扬; 邹德高

doi:10.11779/CJGE201903002

考虑堆石料软化的坝坡随机地震动力稳定分析 English Version

孔宪京^{1, 2},
庞锐^{1, 2},
徐斌^1,2, ,,
周扬^{1, 2},
邹德高^{1, 2}

1. 大连理工大学建设工程学部水利工程学院,辽宁大连116024;
2. 海岸和近海工程国家重点试验室（大连理工大学）,辽宁大连116024

基金项目: 国家重点研发计划项目（2017YFC0404904）; 国家自然科学基金项目（51779034,51679029,51508071）

详细信息

作者简介:
孔宪京(1952- ),男,江苏南京人,博士,教授,博士生导师,主要从事岩土地震工程和高土石坝抗震研究。E-mail：kongxj@dlut.edu.cn。

通讯作者:
徐斌，E-mail：xubin@dlut.edu.cn

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出版历程
- 收稿日期: 2018-02-01
- 发布日期: 2019-03-24

Stochastic seismic stability analysis of dam slopes considering softening of rockfills

KONG Xian-jing^{1, 2},
PANG Rui^{1, 2},
XU Bin^1,2, ,,
ZHOU Yang^{1, 2},
ZOU De-gao^{1, 2}

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

摘要

摘要: 地震尤其强震作用下,土石坝筑坝堆石料会逐渐呈现出软化特性,影响坝坡安全。为有效评估堆石料软化对坝坡稳定性的影响,结合地震动随机性,考虑不同地震强度水平,提出了基于等价极值分布和广义概率密度演化方法的坝坡安全概率分析方法,并基于坝坡稳定最小安全系数、安全系数超限累积时间、累积滑移量3个物理量,对242 m高的面板堆石坝进行随机动力响应分析和概率可靠度分析。结果表明：地震作用过程中,随着地震强度的增加,考虑软化与不考虑软化的计算结果差别逐渐增大,因为地震作用下,堆石料软化特性逐渐显现;同时,在地震激励下,堆石料软化是一个渐进过程。因此,考虑坝坡堆石料软化,对高土石坝抗震性能分析具有重要的意义。此外,单纯从最小安全系数角度考察土石坝坡稳定性,是不合理的,需要结合安全系数超限累积时间和累积滑移量,全面评估坝坡的安全性。提出的随机概率分析方法,可以对土石坝坡的可靠度给出较为准确的评价。
- 高土石坝 /
- 堆石料软化 /
- 随机地震 /
- 坝坡稳定 /
- 概率分析
Abstract: The rockfills of earth-rockfill dams gradually show softening characteristics subjected to earthquakes, especially strong ones, which will affect the safety of dam slopes. In order to evaluate the effect of rockfill softening on the stability of dam slopes, a probability analysis method of dam slope safety based on the equivalent extreme-value distribution and probability density evolution method is proposed considering the stochastic earthquake excitation and different earthquake levels. A 242-m CFRD is used to perform stochastic dynamic response analysis and probabilistic reliability analysis based on three physical parameters of dam slope stability, the minimum safety factor, cumulative time of safety factor (F_s)<1.0 and cumulative slippage. The results show that the difference between considering softening and without considering softening gradually increases with the increase of earthquake intensity, and the attributes to the softening characteristics of rockfills are gradually revealed during the earthquake. Meanwhile, the softening is a gradual process. Hence, it is of great significance to analyze the seismic performance of the high earth-rockfill dams considering softening of rockfills. Moreover, it is unreasonable to study the stability of earth-rockfill dams only from the point of the minimum safety factor, and it is necessary to combine the cumulative time of F_s<1.0 and cumulative slippage to fully evaluate the safety of dam slope. The proposed stochastic probabilistic analysis method can give a more accurate evaluation of the reliability of high earth-rockfill dam slopes.
- high earth-rockfill dam /
- softening of rockfill /
- stochastic earthquake /
- stability of slopes /
- probability analysis

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参考文献(21)

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施引文献(6)

期刊类型引用(4)

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3.	张冬梅，郭力，申轶尧，黄忠凯. 随机地震作用下隧道动力响应的概率密度演化分析. 岩土工程学报. 2024(S2): 21-25+37 . 本站查看
4.	庞锐，陈柯好，宋佚博，徐斌. 近断层脉冲型随机地震动模拟方法及结构动力可靠度研究. 大连理工大学学报. 2024(06): 633-640 . 百度学术