Progressive Changes in Liquefaction and Cone Penetration Resistance across Multiple Shaking Events in Centrifuge Tests
Progressive Changes in Liquefaction and Cone Penetration Resistance across Multiple Shaking Events in Centrifuge Tests
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离心测试中多次振动事件中液化和锥体穿透阻力的逐渐变化
DOI：
10.1061/(asce)gt.1943-5606.0001995
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发表时间：
2019
影响因子：
3.9
通讯作者：
Bronner, Jaclyn D.
中科院分区：
文献类型：
--
作者：
Darby, Kathleen M.;Boulanger, Ross W.;DeJong, Jason T.;Bronner, Jaclyn D.
利用动力离心模型试验的静力触探抗力和循环强度数据，研究了振动历史对基于静力触探（CPT）的洁净饱和砂土液化触发关系的影响。在9 m半径离心机上进行的三个模型试验检查了饱和渥太华F-65砂在多次（17-29次）振动事件下水平剖面的液化响应，这些振动事件产生了密度和模型响应特性的连续变化。从密集的加速度计阵列的数据的逆分析被用来定义整个剖面的循环应力比和剪切应变的时间序列。循环阻力比对触发的超孔隙水压力比在15个等效的均匀周期计算在多个深度的基础上的循环应力比时间序列的加权触发的时间。在每个模型试验期间的选定时间进行的静力锥贯入试验用于确定锥尖阻力随深度和振动历史的变化。由此产生的数据对，归一化锥尖电阻范围从20到340和循环电阻比范围从0.1到2.0，表明这两个数量逐渐增加，作为经常性的液化事件的结果，一般遵循的趋势预测的情况下历史为基础的液化触发相关性。三个1米半径的离心试验的类似配置产生一致的结果。解释的情况下的历史和工程实践的影响进行了讨论。
The effects of shaking history on cone penetration test (CPT)–based liquefaction triggering correlations for clean saturated sand are examined by using cone penetration resistance and cyclic strength data pairs from dynamic centrifuge model tests. Three model tests on a 9-m-radius centrifuge examined the liquefaction responses of level profiles of saturated Ottawa F-65 sand subjected to multiple (17–29) shaking events that produced successive changes in density and model response characteristics. Inverse analysis of data from dense accelerometer arrays were used to define time series of cyclic stress ratios and shear strains throughout the profile. Cyclic resistance ratios against triggering ofexcess pore pressure ratio in 15 equivalent uniform cycles were computed at multiple depths based on weighting of the cyclic stress ratio time series up to the time of triggering. Cone penetration tests performed at select times during each model test were used to define the variation in cone tip resistances with depth and shaking history. The resulting data pairs, with normalized cone tip resistances ranging from 20 to 340 and cyclic resistance ratios ranging from 0.1 to 2.0, show that both quantities progressively increase as a result of recurrent liquefaction events and generally follow the trends predicted by case history–based liquefaction triggering correlations. Three 1-m-radius centrifuge tests of similar configurations produced consistent results. Implications for the interpretation of case histories and engineering practice are discussed.
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DOI：
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发表时间：
1998
期刊：
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