Effects of Periodic Flooding on Shear Resistance of Root-Soil Composite in the Water-level Fluctuation Zone

ZHENG Xiaolan; BAO Yuhai; HE Xiubin; XIE Hangyu; WANG Yingpei

doi:10.13870/j.cnki.stbcxb.2023.05.014

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Effects of Periodic Flooding on Shear Resistance of Root-Soil Composite in the Water-level Fluctuation Zone

更新时间：2025-03-12

- Effects of Periodic Flooding on Shear Resistance of Root-Soil Composite in the Water-level Fluctuation Zone
- Vol. 37, Issue 5, Pages: 111-120(2023)
- 作者机构：
  
  1. 中国科学院、水利部成都山地灾害与环境研究所, 山地表生过程与生态调控重点实验室,成都,610299
  2. 中国科学院大学,北京,100049
  3. 重庆大足工业园区管理委员会,重庆,402368
  4. 重庆市大足区农业农村委员会,重庆,402360
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.05.014
  CLC： X171.4
- Published：2023
- 稿件说明：
移动端阅览
ZHENG Xiaolan, BAO Yuhai, HE Xiubin, et al. Effects of Periodic Flooding on Shear Resistance of Root-Soil Composite in the Water-level Fluctuation Zone[J]. 2023, 37(5): 111-120.
DOI：

ZHENG Xiaolan, BAO Yuhai, HE Xiubin, et al. Effects of Periodic Flooding on Shear Resistance of Root-Soil Composite in the Water-level Fluctuation Zone[J]. 2023, 37(5): 111-120. DOI： 10.13870/j.cnki.stbcxb.2023.05.014.

摘要

为了探究三峡水库消落带根土复合体抗剪性能的影响机制

以狗牙根根土复合体为研究对象

利用三轴试验

定量分析含水率、干湿交替次数以及含根量对根土复合体抗剪性能的影响。结果表明:(1)随着干湿交替次数和含水率的增加

土壤抗剪性能逐渐劣化

含水率13%的根土复合体抗剪强度依次比含水率18%、含水率23%的土壤抗剪强度提高0.12%~14.76%

12.47%~21.14%;经历干湿交替6次与3次的根土复合体抗剪强度比经历1次的降低6.31%~14.71%与2.41%~8.19%。(2)根系含量能显著影响土壤抗剪性能

含根量为1.5 mg/cm3的土壤抗剪强度比含根量为0.5 mg/cm3的土壤抗剪强度提高0.86%~21.10%

内摩擦角增长0.09%~16.31%

黏聚力增长2.27%~30.55%。(3)含水率是影响土壤抗剪性能最主要的因素

对抗剪强度的贡献程度排序上为含水率(61.30%)>干湿交替次数(21.17%)>含根量(8.28%)。研究结果为消落带固土护岸的物种筛选、群落构建、水土保持生态建设、生态系统重建以及水库岸线管理等提供科学依据。

Abstract

In order to explore the impact mechanism of the shear resistance of root-soil composite in the Three Gorges Reservoir's water-level fluctuation zone

this study took root-soil composite of Cynodon dactylon as the research object

and used the triaxial test to quantitatively analyze the influence of water content

dry-wet alternate times and root content on the shear resistance of root-soil composite. The results showed that:(1) With the increasing of dry-wet alternate times and water content

the soil shear resistance gradually deteriorated. The shear resistance of the root-soil composite with 13% water content was 0.12%~14.76% and 12.47%~21.14% higher than that of the soil with 18% water content and 23% water content

respectively. The shear resistance of the root-soil composite subjected to 6 and 3 cycles of dry-wet alternation was 6.31%~14.71% and 2.41%~8.19% lower than that subjected to one cycle of dry-wet alternation. (2) Root content could significantly affect the soil shear resistance

and the soil shear resistance with root content of 1.5 mg/cm3 was 0.86%~21.10% higher than that with root content of 0.5 mg/cm3. The internal friction angle increased by 0.09%~16.31%

and the cohesion increased by 2.27%~30.55%. (3) Water content was the dominant factor affecting the soil shear strength. The order of contribution to the shear resistance was water content (61.30%) > dry-wet alternate times (21.17%) > root content (8.28%). This study provided scientific reference for species screening

community construction

ecological construction of soil and water conservation

ecosystem reconstruction

and reservoir management in the water-level fluctuation zone of the Three Gorges Reservoir.

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