Effect of dry density on saturated seepage characteristics of granite colluvial soil under low hydraulic gradient

Luo Guipeng; Jiang Xiuzi; Yang Guiqing; Dong Hui

doi:10.13961/j.cnki.stbctb.2025.02.003

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Effect of dry density on saturated seepage characteristics of granite colluvial soil under low hydraulic gradient

- Effect of dry density on saturated seepage characteristics of granite colluvial soil under low hydraulic gradient
- Bulletin of Soiland Water Conservation Vol. 45, Issue 2, Pages: 22-29(2025)
- 作者机构：
  
  1. 湘潭大学土木工程学院湖南,湘潭,411105
  2. 岩土力学与工程安全湖南省重点实验室,湖南,湘潭,411105
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2025.02.003
  CLC： TU411.4
- Online First：16 May 2025，
  
  Published：2025
- 稿件说明：
移动端阅览
Luo Guipeng, Jiang Xiuzi, Yang Guiqing, et al. Effect of dry density on saturated seepage characteristics of granite colluvial soil under low hydraulic gradient[J]. Bulletin of Soiland Water Conservation, 2025, 45(2): 22-29.
DOI：

Luo Guipeng, Jiang Xiuzi, Yang Guiqing, et al. Effect of dry density on saturated seepage characteristics of granite colluvial soil under low hydraulic gradient[J]. Bulletin of Soiland Water Conservation, 2025, 45(2): 22-29. DOI： 10.13961/j.cnki.stbctb.2025.02.003.

摘要

[目的

]

探究花岗岩崩积土低水力梯度下的渗流规律，为区域的工程建设和地质灾害防治提供科学依据。[方法

]

通过开展不同干密度条件下花岗岩崩积土的常水头渗透试验，研究了花岗岩崩积土在低水力梯度下的渗流特征。[结果

]

不同初始干密度条件下花岗岩崩积土渗流速度(v)与水力梯度(i)的关系曲线(v-i)在低水力梯度下均表现出不同程度的波动性，且渗透系数均随水力梯度增加而增大，当水力梯度增大到临界水力梯度i

时，渗透系数基本保持不变，近似线性渗流，此时的渗透系数随干密度增加呈对数下降。同时，当土体干密度小于1.5 g/cm

时临界水力梯度i

波动较大，当干密度大于1.5 g/cm

时临界水力梯度i

随干密度呈线性增长。[结论

]

不同干密度条件下花岗岩残积土的饱和渗流在低水力梯度下均具有波动特征，且渗流波动性的内在原因与孔隙特征的变化有关。研究成果为花岗岩崩坡积土的渗流过程研究提供了新的视角，为花岗岩崩坡积土的固结分析和渗透稳定性计算提供了参考。

Abstract

[Objective] The seepage behavior of granite colluvial soil under a low hydraulic gradient was explored，in order to provide a scientific basis for regional engineering construction and geological disaster prevention and mitigation. [Methods] Constant head permeability tests were conducted on granite colluvial soil with varying initial dry densities to analyze its seepage characteristics under low hydraulic gradient. [Results] The relation curves between seepage velocitiy (v) and hydraulic gradient (i) (v-i) of granite colluvial soil exhibits varying degrees of seepage fluctuation under low hydraulic gradients. The permeability coefficient increases with the hydraulic gradient across all dry density conditions. When the hydraulic gradient reached the critical hydraulic gradient (icr)

the permeability coefficient remained stable and undergoes approximately linear seepage. At this time

the permeability coefficient decreases logarithmically with the increase of dry density. Additionally

under low dry density conditions

the transition in the critical hydraulic gradient fluctuates significantly. However

when the dry density exceeds 1.5 g/cm3

the critical hydraulic gradient (icr) increases linearly with dry density. [Conclusion] The saturated seepage behavior of granite colluvial soil under different dry density conditions exhibits fluctuation characteristics under a low hydraulic gradient. The internal mechanism driving these fluctuations is closely related to variations in pore structure. These findings offer a novel perspective on the seepage process of granite colluvial soil and provide a reference for consolidation analysis and seepage stability calculation in engineering applications.

关键词

Keywords

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