基于土颗粒三维理想模型的黏性土渗透系数研究
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TV139.14

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国家自然科学基金项目(面上项目,重点项目,重大项目)(516090801)


Study on permeability coefficient of cohesive soil based on three-dimensional ideal model of soil particles
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    摘要:

    黏性土是一种低渗介质,常常作为土石坝、提防、公路路基等构筑物的防渗层,其渗透系数的准确表达直接关系到堤坝的安全以及公路的耐久性。利用土颗粒三维理想模型对黏土颗粒表面结合水进行研究,认为结合水就是黏土颗粒的一部分,不参与土中水的渗流,土体中有效孔隙体积不包含结合水的体积;在此基础上引用有效孔隙比概念分别对太沙基、柯森–卡门、达西等3种渗透系数经验公式进行了修正;对广西贵隆高速工程现场的典型红黏土进行了渗透试验,将实测值与修正前后的三种公式分别进行了对比,验证了修正公式的合理性;通过对修正公式计算结果的对比分析认为,经修正后的柯森–卡门渗透系数经验公式比之其他公式更符合广西地区红黏土渗透系数的计算。该研究为广西地区高速公路路基的防渗设计与施工提供重要参考。

    Abstract:

    Cohesive soil is a kind of low permeability medium, which is often used as an anti-seepage layer for structures such as earth-rock dams, guards, highway subgrades, etc. The accurate expression of the permeability coefficient is directly related to the safety of the dam and the durability of the road.? The three-dimensional ideal model of soil particles is used to study the water bound on the surface of clay particles. It is considered that the combined water is part of the clay particles and does not participate in the seepage of water in the soil. The effective pore volume in the soil does not contain the volume of bound water; On this basis ,The effective void ratio concept has modified the three empirical formulas of permeability coefficient of Terzaghi, Kozeny-Carman and Darcy respectively. The typical red clay on the site of Guilin High-speed Project in Guangxi was tested for penetration, and the measured values ??were corrected before and after the correction. The three formulas are compared respectively to verify the rationality of the correction formula. By comparing and analyzing the calculation results of the modified formula, it is concluded that the modified empirical formula of the Kozeny-Carman permeability coefficient is more in line with the red clay in Guangxi than other formulas. Calculation of the permeability coefficient. This study provides an important reference for the anti-seepage design and construction of highway subgrade in Guangxi.

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胡其志,邹强,李鸣,等. 基于土颗粒三维理想模型的黏性土渗透系数研究[J]. 科学技术与工程, 2020, 20(11): 4512-4519.
Hu Qizhi, Zou Qiang, Li Ming, et al. Study on permeability coefficient of cohesive soil based on three-dimensional ideal model of soil particles[J]. Science Technology and Engineering,2020,20(11):4512-4519.

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历史
  • 收稿日期:2019-07-28
  • 最后修改日期:2020-01-03
  • 录用日期:2019-09-27
  • 在线发布日期: 2020-05-29
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