粉砂土抗剪强度黏粒含量效应
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TU 443

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国家自然科学基金青年(51509274);河南省高等学校青年骨干教师资助计划项目(2019GGJS142);中原工学院基本科研业务费专项资金项目(K2018YY013、K2018YY012);河南省科技攻关项目(202102310584);河南省高等学校重点科研项目计划(15A560013)


Study on the Effect of Clay Content on Shear Strength of Silty Sand
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    摘要:

    为分析黏粒含量对遗址土抗剪强度特性的影响规律及其形成机理,以遗址粉砂土为研究对象,用常规直剪仪开展不同黏粒含量的慢剪试验,并对部分土样进行微观试验。直剪试验结果表明,黏粒含量从0%增至25%的过程中,抗剪强度显著提高,黏聚力c呈两段折线型增长(拐点位于黏粒含量10%处)特征,高、低应力段的差值逐渐减小直至基本相同,而内摩擦角φ则随黏粒含量增加而减小;在试验干密度和黏粒含量范围内,粉砂土按照规范法拟合所得低应力段的抗剪强度大于实测值,用于土遗址稳定性等分析时偏于不安全。结合扫描电镜试验结果,认为造成土样黏聚力c随黏粒含量呈折线型变化的主要原因是,当黏粒含量大于10%后,遗址土土性从“类砂土”向“类黏土”转变,受力骨架由砂颗粒向“黏粒网架”过渡。

    Abstract:

    In order to analyze the influence of clay content on the shear strength index of site soil and its formation mechanism, the slow shear tests with different clay content were carried out with the conventional direct shear apparatus, and some soil samples were tested with relevant micro tests. The results of direct shear test show that when the content of clay increased from 0% to 25%, the cohesion c increased in a two-stage broken line (the inflection point was at 10% clay content), and the difference between the high and low stress segments decreased gradually. At last, the strength was basically the same for the 25% clay content. The cohesion c was more significant than the internal friction angle φ with the increasing of clay content. The shear strength of silty soil with different dry density and clay content is higher than the measured results, which is not safe for earthen ruins stability analysis. Combined with the results of SEM test, the main reason for the change of strength parameters with clay content is that when the clay content is more than 10%, the soil property of the site changes from "sandy like" to "clay like", and the stress skeleton changes from sand to "clay grid".

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任克彬,郑文举,刘彭彭,等. 粉砂土抗剪强度黏粒含量效应[J]. 科学技术与工程, 2021, 21(17): 7286-7292.
Ren Kebin, Zheng Wenju, Liu Pengpeng, et al. Study on the Effect of Clay Content on Shear Strength of Silty Sand[J]. Science Technology and Engineering,2021,21(17):7286-7292.

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  • 收稿日期:2020-10-14
  • 最后修改日期:2021-02-22
  • 录用日期:2021-02-22
  • 在线发布日期: 2021-07-02
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