紫色土埂坎根-土复合体土水特性与抗剪强度

郑文娇; 韦杰; 唐强; 李进林; 何颖

doi:10.13870/j.cnki.stbcxb.2023.04.011

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紫色土埂坎根-土复合体土水特性与抗剪强度

更新时间：2025-03-12

- 紫色土埂坎根-土复合体土水特性与抗剪强度
- Soil-water Characteristics and Shear Strength of Root-soil Composites from Purple-soiled Bunds
- 水土保持学报 2023年37卷第4期页码：75-82
- 作者机构：
  
  1. 重庆师范大学地理与旅游学院, 三峡库区地表过程与环境遥感重庆市重点实验室,重庆,401331
  2. 三峡库区地表生态过程重庆市野外科学观测研究站,重庆,401331
  3. 西南大学地理科学学院, 重庆金佛山喀斯特生态系统国家野外科学观测研究站,重庆,400715
  4. 中国科学院重庆绿色智能技术研究院,重庆,400714
- 作者简介：
  
  [ "郑文娇(1998-),女,硕士研究生,主要从事土壤侵蚀与水土保持研究。E-mail:joeyhere2022@foxmail.com" ]
- 基金信息：
  
  重庆市杰出青年科学基金项目(cstc2019jycjjqX0025);重庆英才青年拔尖人才项目(CQYC201905009);四川省科技计划项目(2020YJ0202,2021YFS0288);国家级大学生创新创业训练计划项目(202110637004)
- DOI：10.13870/j.cnki.stbcxb.2023.04.011
  中图分类号： S157.3
- 纸质出版：2023
- 稿件说明：
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郑文娇, 韦杰, 唐强, 等. 紫色土埂坎根-土复合体土水特性与抗剪强度[J]. 水土保持学报, 2023,37(4):75-82.

ZHENG Wenjiao, WEI Jie, TANG Qiang, et al. Soil-water Characteristics and Shear Strength of Root-soil Composites from Purple-soiled Bunds[J]. 2023, 37(4): 75-82.
郑文娇, 韦杰, 唐强, 等. 紫色土埂坎根-土复合体土水特性与抗剪强度[J]. 水土保持学报, 2023,37(4):75-82. DOI： 10.13870/j.cnki.stbcxb.2023.04.011.

ZHENG Wenjiao, WEI Jie, TANG Qiang, et al. Soil-water Characteristics and Shear Strength of Root-soil Composites from Purple-soiled Bunds[J]. 2023, 37(4): 75-82. DOI： 10.13870/j.cnki.stbcxb.2023.04.011.

摘要

研究根-土复合体土-水特征曲线与抗剪强度的关系

可为紫色土埂坎根-土复合体强化机理的揭示与埂坎稳定性的维持提供科学依据。选取三峡库区典型紫色土坡耕地埂坎草本植物根—土复合体为研究对象

结合Hyprop2土壤水分特征曲线测量仪、滤纸法与直剪试验

拟合土-水特征曲线

揭示基质吸力对根-土复合体抗剪强度的影响。结果表明:(1)根-土复合体土-水特征曲线明显分为边界效应区、过渡区与非饱和残余区

3种常用模型(B-C、VG、F-X)中F-X模型拟合该曲线效果最好

根-土复合体饱和含水率、进气吸力、残余区含水率以及相同体积含水率下的基质吸力均高于素土。(2)随着体积含水率降低

根-土复合体黏聚力先增大后减小

试验范围内黏聚力最大值51.25 kPa出现在体积含水率约23%时

内摩擦角则线性增大。相同体积含水率下

根-土复合体黏聚力较素土最大增加50%

内摩擦角提升不大。(3)基质吸力对根-土复合体抗剪强度的增强作用具有阶段性特征

各阶段临界吸力值与土-水特征曲线一致

过渡区(基质吸力为3~500 kPa)土体抗剪强度提高明显

进入非饱和残余区后(基质吸力>500 kPa)由于黏聚力下降

土体抗剪强度增速减慢

根-土复合体抗剪强度随基质吸力增大而提升的幅度大于素土。通过建立埂坎根-土复合体土-水特征曲线和抗剪强度的关系

可估测实际工况下的埂坎土体抗剪强度

进而为坡耕地埂坎的建设、维护管理以及坡耕地侵蚀阻控提供理论依据。

Abstract

Investigating the relationship between soil-water characteristic curve (SWCC) and shear strength of root-soil composites is expected to provide a scientific basis for revealing the strengthening mechanism of purple-soiled root-soil composites and maintaining the stability of soil bunds. The root-soil composites of herbaceous plants on the soil bunds of typical purple-soiled sloping farmlands in the Three Gorges Reservoir region was selected as the research object

and the effect of matrix suction on the shear strength of root-soil composites was constructed by using Hyprop2 soil moisture characteristic curve measuring instrument

filter paper method combined with the direct shear test. Major findings were: (1) SWCC of the root-soil composites could be divided into boundary effect zone

transition zone

and unsaturated residual zone

and the F-X model fitted best among the three commonly used models (B-C

F-X). The saturated water content

air intake suction

residual water content

and suction at the same volumetric water content of the root-soil composites were all higher than those of the plain soil. (2) The cohesion of the root-soil composites first increased and then decreased with the decreasing volumetric moisture content

and the maximum cohesion of 51.25 kPa in the test range occurred at a volumetric moisture content of about 23%. At the same time

the angle of internal friction increased linearly. The cohesion of root-soil composites increased by 50% compared with plain soil at the same volumetric water content

and the internal friction angle was not greatly enhanced. (3) The enhancement effect of matrix suction on the shear strength of root-soil composites and its parameters had a stage-specific characteristic

and the critical suction value of each stage was consistent with the SWCC. The shear strength of soil in the transition zone(where the matrix suction was 3~500 kPa) was most obviously improved. After entering the unsaturated residual zone (matrix suction was greater than 500 kPa)

the shear strength of soil increased at a slower rate due to the decrease of cohesion. In addition

the shear strength of the root-soil composites raised with increasing matrix suction to a greater extent than that of the plain soil. Establishing the relationship between SWCC and shear strength of the root-soil composites of purple-soiled bunds could estimate the shear strength of soil bunds under actual working conditions

which provides an important theoretical support for the construction

maintenance and management of slope cultivated land and the erosion control of slope cultivated land.

关键词

Keywords

references

Luo Y L, Wei J, Tang Q, et al. Water seepage and retention in purple soil bunds on sloping farmland in the Three Gorges Reservoir area, China[J]. Land Degradation and Development,2022,33(9):1410-1422.

李进林,韦杰.三峡库区坡耕地埂坎类型、结构与利用状况[J].水土保持通报,2017,37(1):229-233.

Wei J, Shi B L, Li J L, et al. Shear strength of purple soil bunds under different soil water contents and dry densities: A case study in the Three Gorges Reservoir Area, China[J].Catena,2018,166:124-133.

李珍玉,欧阳淼,肖宏彬,等.植物根系生长形态对膨胀土边坡土体抗剪强度的影响[J].中南大学学报(自然科学版),2022,53(1):181-189.

Shuai F, Huang M Y, Zhan Y Y, et al. Effects of herbaceous plant roots on the soil shear strength of the collapsing walls of Benggang in Southeast China[J]. Forests,2022,13(11):e1843.

吴宏伟.大气-植被-土体相互作用:理论与机理[J].岩土工程学报,2017,39(1):1-47.

周萍,文安邦,严冬春,等.三峡库区紫色土坡耕地草本地埂植物根系分布及抗拉力学特征[J].水土保持通报,2017,37(3):1-6.

甘凤玲,韦杰,李沙沙.紫色土埂坎典型草本根系摩阻特性对土壤含水率的响应[J].草业学报,2022,31(7):28-37.

颜哲豪,谌芸,刘枭宏,等.喀斯特坡2种地埂篱根-土复合体抗剪和抗冲性能综合评价[J].生态学报,2022,42(5):1811-1820.

闫亚景,文宝萍,计博勋.基质吸力对非饱和重塑黄土抗剪强度的贡献[J].工程地质学报,2011,19(6):865-874.

Zhai Q, Rahardjo H, Satyanaga A, et al. Estimation of unsaturated shear strength from soil-water characteristic curve[J]. Acta Geotechnica,2019,14:1977-1990.

Fredlund D G, Morgenstern N R, Widger R A. The shear strength of unsaturated soils[J].Canadian Geotechnical Journal,1978,15(3):313-321.

Vanapalli S K, Fredlund D G, Pufahl D E, et al. Model for the prediction of shear strength with respect to soil suction[J].Canadian Geotechnical Journal,1996,33(3):379-392.

李涛,刘波,杨伟红,等.基质吸力对重塑红黏土抗剪强度影响的试验研究[J].中国矿业大学学报,2013,42(3):375-381.

王钊,杨金鑫,况娟娟,等.滤纸法在现场基质吸力量测中的应用[J].岩土工程学报,2003,25(4):405-408.

Corey R. Hydraulic properties of porous media and their relation to drainage design[J].Transactions of the ASAE,1964,7(1):26-28.

Van Genuchten M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science Society of America Journal,1980,44(5):892-898.

Fredlund D G, Xing A. Equations for the soil-water characteristic curve[J].Canadian Geotechnical Journal,1994,31(4):521-532.

汪时机,杨振北,李贤,等.干湿交替下膨胀土裂隙演化与强度衰减规律试验研究[J].农业工程学报,2021,37(5):113-122.

中华人民共和国水利部.GB/T 50123-2019土工试验方法标准[S].北京:中国计划出版社,2019.

李文政,刘目兴,易军,等.三峡山地不同坡位土壤的水分特征曲线及水力学性质[J].水土保持学报,2021,35(3):135-142.

王红兰,唐翔宇,鲜青松,等.紫色土水分特征曲线室内测定方法的对比[J].水科学进展,2016,27(2):240-248.

王轩,李珍玉,肖宏彬,等.基于土-水特征曲线的植物边坡抗剪强度研究[J].水土保持学报,2021,35(5):57-62.

丁小刚,余云燕,蔺文博,等.非饱和弱膨胀土土-水特征曲线拟合与渗透系数模型预测[J].中南大学学报(自然科学版),2022,53(1):361-370.

Leung A K, Garg A, Coo J L, et al. Effects of the roots of Cynodon dactylon and Schefflera heptaphylla on water infiltration rate and soil hydraulic conductivity[J]. Hydrological Processes,2015,29(15):3342-3354.

蔡国庆,张策,黄哲文,等.含水率对砂质Q3黄土抗剪强度影响的试验研究[J].岩土工程学报,2020,42(增刊2):32-36.

洪本根,罗嗣海,胡世丽,等.基质吸力对非饱和离子型稀土抗剪强度的影响[J].岩土力学,2019,40(6):2303-2310.

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