Strain Potential of Liquefied Soil

Strain Potential of Liquefied Soil
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液化土的应变势

DOI:
10.1061/(asce)gt.1943-5606.0002896
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发表时间:
2022
影响因子:
3.9
通讯作者:
Bray, Jonathan D.
Bray, Jonathan D.
中科院分区:
工程技术2区
文献类型:
--
作者:
Olaya, Franklin R.;Bray, Jonathan D.

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几种广泛使用的液化后地基变形现场估算方法都是基于一系列循环简单剪切试验的实验室数据,这些试验是在一种均匀的干净砂土上进行的,并重新组合成三种相对密度。目前尚不清楚这一数据集的趋势是否适用于其他清洁砂,非塑性粉砂和非塑性粉砂。一个数据库的579个试验结果的液化后体积应变,包括299个试验结果,涉及最大剪切应变的安全系数,对液化触发,被编译和用于检查这些土壤的趋势。该数据库包括10个干净的砂,2砾石,3粉砂,5粉砂,和3粘性土循环后的测试数据。扩大的循环试验数据库被用来开发模型,估计液化后的体积应变和最大剪切应变的土壤类型,状态和地震需求的函数。该模型适用于均匀非塑性土。除相对密度和孔隙比外,还使用状态参数来表征土壤的状态。这些参数之间的相关性使完整的数据集能够为模型提供信息。
Several widely used field methods for estimating postliquefaction ground deformation are based on the laboratory data from one series of cyclic simple shear tests performed on one uniform clean sand reconstituted to three relative densities. It is not clear if the trends of this one data set are applicable to other clean sands, nonplastic silty sands, and nonplastic silts. A database of 579 test results on postliquefaction volumetric strain, including 299 test results that relate maximum shear strain to the factor of safety against liquefaction triggering, was compiled and used to examine trends for these soils. The database includes postcyclic test data on 10 clean sands, 2 gravels, 3 silty sands, 5 silts, and 3 clayey soils. The enlarged cyclic testing database was used to develop models that estimate postliquefaction volumetric strain and maximum shear strain as a function of soil type, state, and seismic demand. The models are applicable to uniform nonplastic soil. The state parameter was used in addition to relative density and void ratio to characterize the state of the soil. Correlations between these parameters enable the full data set to inform the models.
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