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| 夹层泥化粗粒土三轴试验的颗粒流模拟研究 |
| Grain flow Simulation of Triaxial shear test of Coarse grained soil formed by the argillization of weak interlayers |
| 投稿时间：2023-07-08 修订日期：2023-11-06 |
| DOI： |
| 中文关键词: 软弱夹层；泥化粗粒土；颗粒流模拟；抗剪强度 |
| 英文关键词: Weak interlayer; Argillaceous coarse-grained soil; Particle flow simulation; Shear strength |
| 基金项目:湖南省自然科学基金项目( 2020JJ4298) ：库岸斜坡软弱夹层泥化损伤机制及工程效应研究 |
| 作者 | 单位 | 邮编 | | 肖拥军* | 湖南科技大学地球科学与空间信息工程学院 | 411201 |
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| 中文摘要: |
| 本文以三峡库区黄土坡滑坡滑床软弱夹层泥化的粗粒土为研究对象，利用PFC3D颗粒流软件对泥化粗粒土进行三轴模拟试验分析，以球形颗粒作为基础单元，对1mm以下细颗粒采用等质量替换的方法适当减少颗粒数量来提高计算效率。基于前人研究的同类土的室内三轴试验曲线来调试模拟参数，并将其参数作为下一步模拟试验的参数取值。模拟结果表明，当分维数为2.312时，随着球形颗粒最大粒径从20mm减小到10mm、5mm，其样品黏聚力和内摩擦角有所减小。当根据实际颗粒形态将PFC基础颗粒设定为四个球形颗粒组成的近四面体颗粒簇时，得到的粗粒土粘聚力比前述研究的球形颗粒模型有所增加，内摩擦角增加较大，说明颗粒形状是粗粒土抗剪强度的关键影响因素。当泥化粗粒土分维数增大，模拟得到黏聚力增加较多，摩擦角有所减少。在四面体颗粒料模型中进一步考虑夹层泥化粗粒土中细颗粒流失的过程，得到其抗剪强度参数会随细颗粒冲蚀量增加有所降低。 |
| 英文摘要: |
| This article focuses on the study of interlayered argillaceous coarse-grained soil in the sliding bed of Huangtupo landslide in the Three Gorges Reservoir Area, PFC3D particle flow software was used to conduct triaxial simulation test analysis on muddy coarse-grained soil by using spherical particles as the basic unit, the method of equal mass replacement is adopted for fine particles below 1mm to appropriately reduce the number of particles and improve computational efficiency.Based on previous research on the stress-strain curve and volumetric strain curve obtained from the indoor triaxial test of the interlayer argillized coarse grained soil sample in the third section of the Badong Formation, the parameters are continuously adjusted to make the stress-strain curve and numerical simulation curve of the indoor test consistent, and their parameters are used as parameter values for the simulation test. when the fractal dimension is 2.312, as the maximum particle size of spherical particles decreases from 20mm to 10mm and 5mm,the simulation results show that the sample cohesion and internal friction angle decrease.when the idealized PFC basic particles are set as a nearly tetrahedral particle cluster composed of four spherical particles based on the actual particle morphology, the obtained cohesive force increases compared to the spherical particle model studied earlier, and the internal friction angle increases significantly, this result indicates that particle shape is a key influencing factor on the shear strength of coarse-grained soil.When the fractal dimension of coarse-grained soil increases, the simulation shows that the cohesion increases more and the friction angle decreases.In the tetrahedral particle material model, further consideration is given to the process of fine particles being eroded by groundwater in the interlayer argillated coarse-grained soil, and the shear strength parameters will decrease with the increase of fine particle erosion. |
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