初始含水率对崩岗土体抗拉特性的影响

冯延云; 张晓明; 朱丽丽; 王佳妮

doi:10.13870/j.cnki.stbcxb.2019.05.007

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初始含水率对崩岗土体抗拉特性的影响

更新时间：2025-03-12

- 初始含水率对崩岗土体抗拉特性的影响
- Effect of Initial Moisture Content on Tensile Resistance of Collapsed Soil
- 水土保持学报 2019年33卷第5期页码：41-49
- 作者机构：
  
  华中农业大学资源与环境学院,武汉,430070
- 作者简介：
  
  [ "冯延云(1994-),男,甘肃白银人,硕士研究生,主要从事崩岗土体稳定性研究。E-mail:fengyanyun9965@163.com" ]
- 基金信息：
  
  国家自然科学基金项目（41771307，41201271）长江科学院开放研究基金项目（CKWV2017522/KY）
- DOI：10.13870/j.cnki.stbcxb.2019.05.007
  中图分类号：
- 纸质出版：2019
- 稿件说明：
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冯延云, 张晓明, 朱丽丽, 等. 初始含水率对崩岗土体抗拉特性的影响[J]. 水土保持学报, 2019,33(5):41-49.

FENG Yanyun, ZHANG Xiaoming, ZHU Lili, et al. Effect of Initial Moisture Content on Tensile Resistance of Collapsed Soil[J]. 2019, 33(5): 41-49.
冯延云, 张晓明, 朱丽丽, 等. 初始含水率对崩岗土体抗拉特性的影响[J]. 水土保持学报, 2019,33(5):41-49. DOI： 10.13870/j.cnki.stbcxb.2019.05.007.

FENG Yanyun, ZHANG Xiaoming, ZHU Lili, et al. Effect of Initial Moisture Content on Tensile Resistance of Collapsed Soil[J]. 2019, 33(5): 41-49. DOI： 10.13870/j.cnki.stbcxb.2019.05.007.

摘要

针对花岗岩发育的崩岗土体崩壁失稳等问题，通过单轴抗拉试验，研究了湖北通城地区不同初始含水率的崩岗土体抗拉强度特性。结果表明：初始含水率对崩岗土壤抗拉强度影响明显。土壤抗拉强度特征曲线为单峰型，表土层、红土层和红砂过渡层抗拉特征曲线在含水率WC（24.4%）附近出现抗拉强度峰值，而砂土层在WC（25.8%）出现抗拉强度峰值。崩岗不同层次土壤轴向拉伸长和径向收缩长随初始含水率呈现正相关关系，且土壤轴向拉伸率和径向收缩率与初始含水率拟合出相关系数较高的线性函数关系（除砂土层的径向收缩率与初始含水率呈指数函数关系）。低（18%~22%）、中（22%~30%）、高（30%~饱和）3种初始含水率区间下崩岗土壤持水机制分别为土壤毛细管持水机制、团粒水桥联结持水机制与团粒持水机制。研究结果可为崩岗科学防治提供一定的科学依据。

Abstract

Aiming at the problems instability of collapsed hill soil deveoped by granite

the tensile strength characteristics of collapsed hill soil with different initial water contents were studied by uniaxial tensile test in Tongcheng area of Hubei Province. The results showed that the initial moisture contents had a significant effect on the tensile strength of the collapsed soil. The characteristic curve of soil tensile strength appeared as a unimodal curve. The peak values were obtained at the water content of WC(24.4%) for the surface soil

laterite and red sand transition layer

while WC(25.8%) for the sandy layer. The axial and radial shrinkage lengths of different soil layers were positively correlated with the initial water contents

and the linear relationships between the axial and radial shrinkage of soil and the initial water contents were fitted with a higher correlation coefficient (the radial shrinkage of sand removal layer is exponentially correlated with the initial water contents). The mechanisms of water holding in soils with three initial water contents ranging from low (18%~22%)

medium (22%~30%) to high (30%~saturation) was analyzed

which were soil capillary water holding mechanism

aggregate water bridge water holding mechanism and aggregate water holding mechanism respectively. These research results could provide a scientific basis for the scientific prevention and control of collapsed hill.

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