Liquefaction mechanism for layered soils
Liquefaction mechanism for layered soils
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DOI：
10.1061/(asce)0733-9410(1994)120:4(737
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发表时间：
1994-04
期刊：
影响因子：
--
通讯作者：
G. Fiegel;B. Kutter
中科院分区：
文献类型：
--
作者：
G. Fiegel;B. Kutter
给出了四次离心模型试验的结果。其中三个模型试验涉及受地基震动影响的层状土壤沉积物；一个模型试验涉及均匀的砂土沉积，受地基震动的影响。层状土壤模型由细砂上覆一层相对不透水的硅粉（粉）组成。在所有四次测试中都测量了孔隙水压力、加速度和沉降。层状土的模型试验结果表明，在液化过程中，由于渗透性的差异，砂粉界面可能形成水夹层或非常松散的土壤带。在每一层状模型试验中，在粉土层表面均观察到沸腾现象。这些沸腾集中在上覆粉砂层的最薄区域，为细砂中产生的多余孔隙水压力提供了一个出口。
Results from four centrifuge model tests are presented. Three of the model tests involve layered soil deposits subject to base shaking; one model test involves a uniform soil deposit of sand subject to base shaking. The layered soil models consisted of fine sand overlain by a layer of relatively impermeable silica flour (silt). Pore-water pressures, accelerations, and settlements were measured during all four tests. Results from the model tests involving layered soils suggest that during liquefaction a water interlayer or very loose zone of soil may develop at the sand-silt interface due to the difference in permeabilities. In each layered model test, boils were observed on the surface of the silt layer. These boils were concentrated in the thinnest zones of the overlying silt layer and provided a vent for the excess pore-water pressure generated in the fine sand.