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首页> 外文期刊>Journal of Earthquake Engineering >LIQUEFACTION OF OVER-CONSOLIDATED SAND: A CENTRIFUGE INVESTIGATION
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LIQUEFACTION OF OVER-CONSOLIDATED SAND: A CENTRIFUGE INVESTIGATION

机译：过度固结的砂的液化：离心研究

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A centrifuge testing study is conducted to investigate the effect of over-consolidation on liquefaction in clean saturated sand deposits. Thirty-four shaking tests on 11 level-ground models are performed. Soil models with Over-Consolidation Ratios (OCRs) of 1, 2, and 4 at relative densities of 35%, 50%, and 70% are tested. Model response to dynamic base shaking is monitored with accelerometers, pore pressure transducers, and displacement gauges. Test data show that the potential for liquefaction decreases with the increase in OCR, relative density, and prior shaking. The threshold peak acceleration needed to induce excess pore pressure increases as the OCR increases. Over-consolidated sand layers subjected to lower levels of excitation do not experience any excess pore pressure buildup even when shaken for a long duration. For acceleration marginally above the threshold, pore pressure buildup may be mild and liquefaction may be unlikely. As such, preloading can be a practical cost-effective liquefaction remedial technique in sandy soils under earthquake loading scenarios resulting in peak acceleration of up to about 0.15g.
机译：进行了离心测试研究，以研究超固结对清洁的饱和砂岩沉积物中液化的影响。在11个水平地面模型上进行了34次振动测试。测试了相对固结率分别为35％，50％和70％的超固结比（OCR）为1、2和4的土壤模型。使用加速度计，孔隙压力传感器和位移计监控对动态基础振动的模型响应。测试数据表明，液化的可能性随着OCR，相对密度和先前振动的增加而降低。随着OCR的增加，引起过大孔隙压力所需的阈值峰值加速度也会增加。受到较低激发水平的超固结砂层即使长时间振动也不会有任何多余的孔隙压力累积。对于略高于阈值的加速，孔压的累积可能会比较温和，而液化可能不太可能。这样，在地震荷载作用下，预加载可能是一种在砂土中具有成本效益的实用液化补救技术，其峰值加速度最高可达0.15g。

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