Response to the discussion on “Seismic reliability assessment of earth-rockfill dam slopes considering strain-softening of rockfill based on generalized probability density evolution method”
Response to the discussion on “Seismic reliability assessment of earth-rockfill dam slopes considering strain-softening of rockfill based on generalized probability density evolution method”
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DOI：
10.1016/j.soildyn.2018.01.020
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发表时间：
2018-04
影响因子：
4
通讯作者：
Rui Pang;Bin Xu;X. Kong;Degao Zou;Yang Zhou
中科院分区：
文献类型：
--
作者：
Rui Pang;Bin Xu;X. Kong;Degao Zou;Yang Zhou
本文研究了在随机地震激励下考虑堆石料应变软化特性的土石坝边坡抗震可靠度。将谱表示-随机函数法与广义概率密度演化法相结合，提出了一种新的抗震可靠度评估方法。为求解GPDEM方程，将242 m混凝土面板堆石坝的随机地震反应分析转化为确定性动力计算。安全系数的概率信息和地震可靠度表明，考虑堆石料未软化和软化特性的模拟结果随着地震的加剧而差异越来越大，在地震激励下逐渐出现应变软化特性。因此，考虑堆石料的软化特性，对高土石坝的抗震安全性分析具有重要意义。将传统的含安全系数的坝坡稳定性评价指标与安全系数小于1.0的累积时间（Fs <1.0）的新指标进行了比较，表明新指标用于坝坡抗震可靠性评价更合理。结果表明，GPDEM是一种从随机角度进行抗震可靠度评估的有效方法，能直观地反映结构的失效概率。
This paper investigates the seismic reliability of earth-rockfill dam slopes under stochastic earthquake excitation considering strain-softening behaviour of rockfill materials. A new and efficient methodology that couples a recently developed generalized probability density evolution method (GPDEM) with a spectral representation-random function method is presented to assess the seismic reliability. To solve the GPDEM equation, the stochastic seismic responses analysis of a 242-m concrete face rockfill dam (CFRD) is translated into a series of deterministic dynamic calculations. The probability information and seismic reliability of the safety factor demonstrate that the results between the simulations considering unsoftening and softening behaviour of the rockfill materials become increasingly different as the earthquake intensifies, and strain-softening behaviour gradually appear under seismic excitation. Thus, considering the softening characteristic of rockfill materials, is of great significance to analyze the seismic safety of high earth rockfill dams. The traditional index for evaluating dam slope stability with safety factor is compared with a new index the cumulative time of the safety factor less than 1.0 (Fs< 1.0), suggesting that the new index is more reasonable to assess the seismic reliability of dam slopes. The results indicate that the GPDEM is an effective approach to seismic reliability assessment from the stochastic viewpoint and can directly reflect the failure probability.