Quantitative characterization and seepage simulation of porosity in granite soils of gully erosion areas

XU Junkang; CHEN Xin; WANG Jianxun; WEI Yujie; ZHANG Guanghui; CAI Chongfa

doi:10.13300/j.cnki.hnlkxb.2026.02.013

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Quantitative characterization and seepage simulation of porosity in granite soils of gully erosion areas

Resources and environment | 更新时间：2026-11-05

- Quantitative characterization and seepage simulation of porosity in granite soils of gully erosion areas
- Journal of Huazhong Agricultural University Vol. 45, Issue 2, Pages: 122-136(2026)
- 作者机构：
  
  1.华中农业大学资源与环境学院，武汉 430070
  2.武汉大学测绘遥感信息工程国家重点实验室，武汉 430079
  3.中国电建集团华东勘测设计研究院有限公司，杭州 311100
- 作者简介：
- 基金信息：
- DOI：10.13300/j.cnki.hnlkxb.2026.02.013
  CLC： S157
- Received：19 May 2025，
  
  Published：15 March 2026
- 稿件说明：
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徐俊康，陈新，王建勋，等.崩岗侵蚀区花岗岩土壤孔隙的定量表征及渗流模拟［J］.华中农业大学学报，2026，45（2）：122‐136.

XU Junkang,CHEN Xin,WANG Jianxun,et al.Quantitative characterization and seepage simulation of porosity in granite soils of gully erosion areas[J].Journal of Huazhong Agricultural University,2026,45(02):122-136.
徐俊康，陈新，王建勋，等.崩岗侵蚀区花岗岩土壤孔隙的定量表征及渗流模拟［J］.华中农业大学学报，2026，45（2）：122‐136. DOI： 10.13300/j.cnki.hnlkxb.2026.02.013.

XU Junkang,CHEN Xin,WANG Jianxun,et al.Quantitative characterization and seepage simulation of porosity in granite soils of gully erosion areas[J].Journal of Huazhong Agricultural University,2026,45(02):122-136. DOI： 10.13300/j.cnki.hnlkxb.2026.02.013.

摘要

为揭示花岗岩残积土孔隙的渗流规律，解析孔隙尺度水分运移机制，选取崩岗完整风化剖面，对全剖面原状花岗岩风化土体进行X射线计算机断层扫描（CT），并利用AVIZO软件进行三维重构、构建孔隙网络模型，定量化分析花岗岩风化土全剖面孔隙结构特征。结果显示：土壤孔隙度随着风化深度增加呈现下降趋势（4.2%~25.1%），上层土壤（A和B层）明显高于下层砂层（

0.05）。各层次土壤孔隙等效直径主要集中分布于0.1~0.2 mm，方向角集中于40°~ 50°，且各层次方位角分布较为一致。大孔隙（

100 μm）形状以规则球形孔隙为主（0.8~1.0），上层规则孔隙较下层更多。风化剖面从上到下连通孔隙与非连通孔隙变化呈现相反趋势，孔隙连通性逐渐减弱。各层次土壤孔隙网络模型（pore network model，PNM）中连通孔隙半径（0.1~1.0 mm）、配位数及表面积在剖面上均呈现逐渐减少的趋势，上层平均孔喉长度整体高于下层土壤，孔隙网络结构随风化程度增大而逐渐复杂。基于孔隙网络的渗流模拟结果与实测值存在较高拟合度（

=0.96）。孔隙结构参数与渗流导水率之间相关性分析显示，PNM参数（孔喉直径、通道长度、PNM孔隙直径）之间存在显著正相关（

0.05），孔隙形态和方向参数（球度、方向角与方位角）与迂曲度呈显著正相关（

0.05），孔隙连通性与分形维数、孔隙率、配位数、孔喉面积为渗透导水率关键影响因素（

0.05），孔隙几何特征共同影响孔隙网络的结构和功能。结果表明，可以通过花岗岩风化土孔隙的三维重建及孔隙网络结构定量分析，明确风化土壤内部孔隙拓扑空间结构差异特征，解释风化作用下花岗岩土壤非均质性、各向异性、亚稳定结构形成的关键原因。

Abstract

The structural characteristics of pore represent a fundamental aspect of the microscale heterogeneity in weathered granite soils，significantly affecting both the water transport processes and the macroscopic mechanical behavior in soils.A fully weathered gully profile was used to analyze the water transport processes and elucidate the seepage mechanisms in granite residual soils.X-ray computed tomography （CT） was conducted on the weathered soil of intact granite in the entire profile.Three-dimensional （3D） reconstruction and pore network modeling （PNM） were performed with Avizo software to quantitatively characterize the pore structure across the entire profile of soil.The results showed that the porosity in soil had a decreasing trend with the increase of weathering depth ranged from 4.2% to 25.1%，with the porosity in the upper layer of soil （layers A and B） significantly higher than that in the lower layer of sand （

0.05）.The equivalent diameter of pores in all layers of soil was predominantly distributed in the range of 0.1-0.2 mm，with inclination angles mainly co

ncentrated in the range of 40°-50°，and the distribution of azimuthal angles across layers was relatively consistent.Macropores （

100 μm） were mostly regular and spherical in shape with sphericity of 0.8-1.0，and more regular pores were observed in the upper layers.The connected and isolated pores showed opposite trends from the top to the bottom of the weathering profile，indicating that there is a gradual decrease in pore connectivity with depth.The radius （0.1-1 mm） of connected pore，coordination number，and the surface area of pore decreased gradually along the weathering profile in the pore network models （PNM） of different layers.The average length of pore throat in the upper layers was generally higher than that in the lower layers.Flow simulations based on the PNM had a strong agreement with measured saturated hydraulic conductivity，with a high coefficient of determination （

² = 0.96）.There were significant positive relationships among key PNM parameters including the diameter of pore throat，channel length，and the radius of connected pore （

0.05）.The morphological and directional parameters of pore including the sphericity，inclination angle，and azimuthal angle were significantly positively correlated with tortuosity （

0.05）.The connectivity of pore，fractal dimension，porosity，coordination number，and throat area were identified as key factors affecting the saturated hydraulic conductivity，indicating that the geometric attributes of pore collectively govern the structure and function of the pore network.It is indicated that 3D reconstruction and quantitative analysis of structures of pore network in weathered granite soils can be used to clarify the differences in topological and spatial structure of pores inside weathered soil，and explain the key reasons for the formation of heterogeneity，anisotropy，and metastable structure of granite soils under weathering.

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references

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