Calibration of non-linear effective stress code for seismic analysis of excess pore pressures and liquefaction in the free field
Calibration of non-linear effective stress code for seismic analysis of excess pore pressures and liquefaction in the free field
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自由场超孔隙水压力和液化地震分析非线性有效应力代码的标定
DOI：
10.1016/j.soildyn.2018.01.029
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发表时间：
2018
影响因子：
4
通讯作者：
T. Abdoun
中科院分区：
文献类型：
--
作者：
R. Dobry;W. El;T. Abdoun
本文介绍了四个离心模型试验的超静孔压，液化和沉降响应的数值预测的6米的饱和干净渥太华砂，放置在干plureset和有相对密度从38%到66%。使沉积物经受1D均匀底部摇动，该摇动包括10-15个周期的峰值加速度，范围为0.04至0.12 g。所有预测均采用非线性有效应力数值代码Dmod 2000进行。通过匹配离心实验3中进行的一系列振动的第一次振动（S1）的孔隙压力和沉降测量值，在校准Dmod 2000方面花费了大量精力。这导致了在该振动S1中测量的孔隙压力和沉降的非常好的预测。该练习显示了具有正确的土壤压缩性和渗透性的现实模拟的重要性。通过仅修改不排水孔隙压力模型中的一个参数，将Dmod 2000的校准版本用于相同实验3（S36）中预震存款的良好孔隙压力预测;并且在测试FFV 3和PFV 1中也良好预测孔隙压力响应，除了使用新的输入运动（B类预测）外，Dmod 2000的参数没有任何变化。试验和数值计算结果表明，循环剪应力/应变和上游水流共同决定了孔压恢复和液化现象。土壤的反应是部分排水，而不是不排水，和孔压消散过程中发生的振动之前和之后的液化发生。
The paper presents numerical predictions of excess pore pressure, liquefaction and settlement response of four centrifuge model tests of 6 m uniform deposits of saturated clean Ottawa sand, placed by dry pluviation and having a relative density ranging from 38% to 66%. The deposits were subjected to 1D uniform base shaking consisting of 10–15 cycles of peak acceleration ranging from 0.04 to 0.12 g. All predictions were conducted with the nonlinear effective stress numerical code Dmod2000. Significant effort was spent in calibrating Dmod2000 by matching the pore pressure and settlement measurements of the first shaking (S1) of a series of shakings conducted in centrifuge Experiment 3. This resulted in very good predictions of both pore pressures and settlement measured in this shaking S1. The exercise showed the importance for realistic simulations of having the correct soil compressibility and permeability. This calibrated version of Dmod2000 was used for a good pore pressure prediction of the preshaken deposit in the same Experiment 3 (S36), by modifying only one parameter in the undrained pore pressure model; and also well predicted pore pressure responses in Tests FFV3 and PFV1, withoutanychange in the parameters of Dmod2000 except for use of the new input motions (Type B predictions). The experimental and numerical results showed thatbothcyclic shear stress/strainsandupward water flow determinetogetherthe pore pressure buildup and liquefaction phenomena. The soil response is partially drained rather than undrained, and pore pressure dissipation does take place during shaking both before and after liquefaction occurs.
影响因子：
4
作者：
M. Manzari;Mohamed El Ghoraiby;B. Kutter;M. Zeghal;T. Abdoun;P. Arduino;R. Armstrong;M. Beaty;T. Carey;Yunmin Chen;Alborz Ghofrani;D. Gutierrez;Nithyagopal Goswami;S. Haigh;W. Hung;S. Iai;P. Kokkali;Chung-Jung Lee;S. Madabhushi;L. Mejia;M. Sharp;T. Tobita;K. Ueda;Yan-Guo Zhou;K. Ziotopoulou
通讯作者：
M. Manzari;Mohamed El Ghoraiby;B. Kutter;M. Zeghal;T. Abdoun;P. Arduino;R. Armstrong;M. Beaty;T. Carey;Yunmin Chen;Alborz Ghofrani;D. Gutierrez;Nithyagopal Goswami;S. Haigh;W. Hung;S. Iai;P. Kokkali;Chung-Jung Lee;S. Madabhushi;L. Mejia;M. Sharp;T. Tobita;K. Ueda;Yan-Guo Zhou;K. Ziotopoulou