[最新文献]通过微生物诱导的部分饱和度来缓解含有非塑性细砂的液化 [11/20/2020]

1 论文

Liquefaction Mitigation of Sands with Nonplastic Fines via Microbial-Induced Partial Saturation 通过微生物诱导的部分饱和度来缓解含有非塑性细砂的液化

bstract: A review of liquefaction case histories shows that sand deposits containing some fines were common in past liquefaction events. While current liquefaction mitigation measures are mostly applicable to clean sands or open sites, development of nondisruptive techniques applicable to sands containing fines is critical. This paper examines the application and performance of microbial-induced partial saturation (MIPS) for liquefaction mitigation of sands with various silt contents. The investigation consisted of a set of undrained strain-controlled cyclic direct simple shear (DSS) tests on untreated and MIPS-treated samples. Experimental results suggested that high excess pore pressure was developed in untreated clean and silty sand specimens, which led to liquefaction depending on the shear strain level. Regardless of fines content and induced shear strain amplitude, MIPS-treated samples with only 4%–5% reduction in degree of saturation did not liquefy. A semi-empirical equation was adopted to predict the excess pore pressure generation in partially saturated conditions. The equation is able to reasonably predict the excess pore pressure generated in both clean and silty sands with variable degrees of saturation.

摘要：对液化案例史的回顾表明，在过去的液化事件中，含有一些细沙的砂层是很常见的。虽然目前的液化缓解措施大多适用于干净的沙地或露天场地，但开发适用于含细砂的非破坏性技术至关重要。本文研究了微生物诱导部分饱和(MIPS)在不同含泥砂液化缓和中的应用和性能。调查内容包括对未经处理和MIPS处理的样品进行一组无排水控制的循环直剪(DSS)试验。实验结果表明，在未经处理的洁净砂和淤泥质砂试样中形成了过高的孔隙压力，从而导致液化，这取决于剪切应变水平。无论细粒含量和诱导的剪切应变振幅如何，MIPS处理后的试样饱和度仅降低4%-5%，并没有液化。采用半经验方程来预测部分饱和条件下超孔隙压力的产生。该方程能够合理预测不同饱和度的洁净砂和淤泥质砂中产生的超孔隙压力。

2 相关文献

Note: '相关文献' 是按照Google的排序算法产生出来的.

[1] Liquefaction Phenomenon and Mitigation Strategies for Soil Engineering

[2] Cyclic liquefaction screening of sand with non-plastic fines: Critical state approach

[3] Determination of the transitional fines content of sand-non plastic fines mixtures

[4] Coimbra Sand – Influence of Non-Plastic Fines In Liquefaction Resistance

[5] Undrained Response and Liquefaction Behaviour of Non-Plastic Silty Sands Under Cyclic Loading 

[6] Liquefaction susceptibility of non-plastic silty sands using hypoplastic model simulations

[7] Influence of silt size and content on liquefaction behavior of sands

[8] Study of the influence of fine particles on the properties of liquefaction of sands

[9] Critical undrained shear strength of sand-silt mixtures under monotonic loading

[10] Mitigation of liquefaction of sand using microbial methods

[11] Liquefaction of Sands

[12] Mitigation of sand liquefaction using in situ production of biogas with biosealing

[13] Mitigation of liquefaction of saturated sand using biogas

[14] Liquefaction Mitigation of Silty Sands via Microbial Induced Partial Saturation

[15] Liquefaction Mitigation Using Entrapped Air

[16] Mitigation of liquefaction-induced deformation with magnetorheological mechanism of micron-sized magnetite particles for saturated sand

[17] Field Applications of Induced Partial Saturation (IPS) for Liquefaction Mitigation

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