1.南京工业大学交通运输工程学院,江苏 南京 210009
2.江苏省地震局,江苏 南京 210014
徐令宇(1988-),男,副教授,博士,硕导。主要从事岩土地震工程及城市地下工程方面的研究。Email: xulingyu2008@126.com
收稿:2018-08-14,
修回:2018-12-14,
纸质出版:2020-10-15
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徐令宇,薛莹莹,潘冬冬等.非塑性细粒粒径与含量对饱和砂类土强度的影响[J].防灾减灾工程学报,2020,40(05):741-748.
XU Lingyu,XUE Yingying,PAN Dongdong,et al.Effects of Non⁃plastic Fines Size and Content on Strength of Saturated Sandy Soils[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(05):741-748.
徐令宇,薛莹莹,潘冬冬等.非塑性细粒粒径与含量对饱和砂类土强度的影响[J].防灾减灾工程学报,2020,40(05):741-748. DOI: 10.13409/j.cnki.jdpme.2020.05.008.
XU Lingyu,XUE Yingying,PAN Dongdong,et al.Effects of Non⁃plastic Fines Size and Content on Strength of Saturated Sandy Soils[J].Journal of Disaster Prevention and Mitigation Engineering,2020,40(05):741-748. DOI: 10.13409/j.cnki.jdpme.2020.05.008.
松散状态下的饱和砂类土受剪切后出现静态液化现象,且受到细粒含量、颗粒级配、固结围压等因素的影响。而目前对于中密状态下砂类土的相关研究鲜有报道,特别对于细粒粒径的影响研究尚少。采用福建标准砂与三种不同粒径的石英粉进行混合,开展了一系列三轴不排水压缩试验。试验中保持所有土样的相对密度相同,相对密度控制为50%,同时还考虑了细粒含量(
FC
= 10%, 20%, 30%)、围压(50, 100, 200 kPa)等因素的影响。试验结果表明:相同细粒含量下随着标准砂平均粒径与石英粉平均粒径比
R
d
的增大(
R
d
= 10~65.76),最大孔隙比和最小孔隙比均有增大趋势;在细粒含量较低时(
FC
= 10%和20%),峰值偏应力随着
R
d
的增大呈现近似线性递减关系,而在细粒含量较高时(
FC
=30%),峰值偏应力在
R
d
达到某个临界值迅速下降,而后基本保持不变或者缓慢下降;中等密实状态的砂类土在高细粒含量的情况下可发生静态液化,且平均粒径比
R
d
越大静态液化越容易发生,因此,评估饱和砂类土的强度需要考虑非塑性细粒粒径的不利影响。
Saturated loose sand containing low non-plastic fines is prone to static liquefaction subjected to undrained monotonic loading; this phenomenon is normally termed as static liquefaction, which is affected by various factors, such as non-plastic fines content, particle gradation and confining pressure. However, limited work focused on sandy soils in medium-dense state and especially the effect of silt size on the liquefaction potential of the sandy soils; thus, in this study, a series of strain-controlled monotonic undrained triaxial compression tests are conducted on a single base sand mixed with three different essentially non-plastic silts at three different fines content (
FC
= 10%, 20%, 30%) and three different confining pressure (50 kPa, 100 kPa, 200 kPa). The relative density of all soil samples was the same and has a value of 50%. The results show that: (1) Under otherwise identical conditions, the maximum porosity ratio and the maximum porosity ratio increase with the increase in the average particle size ratio
R
d
in the range of 10~65.76, where
R
d
is defined as the ratio of the average particle diameter of the base sand to the non-plastic silts; (2) the peak deviatoric stress of sandy soils tends to decrease nearly linearly with the increase in
R
d
when
FC
= 10% and 20%; however when
FC
= 30%, the peak deviatoric stress rapidly decreases as
R
d
reaches a critical value and then remains unchanged or slightly decreases with the further increase in the
R
d
; and (3) complete static liquefaction of sandy soils could occur at medium dense state at high fines contents. In addition, static liquefaction is more likely to occur when the
R
d
become larger. Therefore, it is necessary to consider the adverse effect of not only the content of low-plastic fines but also the size of low-plastic fines on undrained strength of sandy soils.
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