钙质结核调控膨胀土裂隙发育的机制与量化表征

贺林; 周秉纬; 黄波清

doi:10.20265/j.cnki.issn.1007-2993.2025-0348

钙质结核调控膨胀土裂隙发育的机制与量化表征

doi: 10.20265/j.cnki.issn.1007-2993.2025-0348

贺林^{1, 2,},
周秉纬¹,
黄波清¹

1.
陕西地矿汉中地质大队有限公司，陕西汉中　723000
2.
西安科技大学地质与环境学院，陕西西安　710000

基金项目: 陕西地矿集团有限公司2024年科研专项资金项目（KYQ202415）

详细信息

作者简介:
贺　林，男，1983年生，在读博士研究生，高级工程师，主要从事岩土工程相关科研工作。E-mail：helin@stu.xust.edu.cn

中图分类号: TU443
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- 文章访问数: 35
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- 被引次数: 0
出版历程
- 收稿日期: 2025-08-07
- 修回日期: 2025-10-21
- 录用日期: 2026-01-08
- 网络出版日期: 2026-10-08
- 刊出日期: 2026-10-08

Mechanism and quantitative characterization of calcareous concretion regulating crack development in expansive soil

1.
Shaanxi Geology and Mining Hanzhong Geological Brigade Co., Ltd., Hanzhong, 723000, Shaanxi, China
2.
School of Geology and Environment, Xi’an University of Science and Technology, Xi’an, 710000, Shaanxi, China

摘要

摘要: 通过在重塑膨胀土中设置不同面积覆盖率的钙质结核类异质体，研发“土体裂隙识别系统”，对脱湿过程中裂隙发育的全过程进行动态监测与量化分析。试验结果表明，异质物对膨胀土裂隙的几何特征与发育进程产生了显著影响，对裂隙率等量化指标实施了系统性调控。随着异质物覆盖率的上升，土体的起裂含水率与拐点含水率出现提前现象，裂隙发育趋向于沿异质物边界构建更为直接且数量较少的扩展路径，同时对裂隙向更宽形态的演变起到抑制作用。其中，15.7%覆盖率为调控效应阈值，在此覆盖率下，土体裂隙率、裂隙总长度和分形维数均达到最大值。异质物对裂隙发育的影响呈现阶段性特征，以应力集中、分割约束以及界面效应共同作用决定了裂隙的萌生、扩展与稳定过程。研究成果可为深入理解含异质物土体裂隙发育机理以及相关工程实践提供理论依据。
- 钙质结核 /
- 异质物 /
- 膨胀土 /
- 调控机制 /
- 量化表征
Abstract: In this study, calcareous concretion-like heterogeneities with different area coverage were incorporated into remolded expansive soil, and the Soil Crack Identification System was employed to dynamically monitor and quantitatively analyze the entire process of crack development during dehydration. The test results show that the heterogeneities have a significant influence on the geometric characteristics and development of the expansion soil cracks, systematically regulating quantitative indicators such as crack rate. With the increase of the heterogeneities coverage, the crack initiation and inflection point moisture content occur earlier, and the crack development tends to form a more direct and fewer expansion paths along the boundaries of the heterogeneities, and inhibits the evolution of cracks to wider morphology. Among them, the coverage of 15.7% is the threshold of regulation effect. Under this coverage, the crack rate, total crack length and fractal dimension all reach the maximum value. The influence of heterogeneities on crack development exhibits staged characteristics, with the stress concentration effect, partition constraint effect and interface effect acting together to determine the process of crack emergence, expansion and stabilisation. The research findings can provide a theoretical basis for an in-depth understanding of the mechanism of crack development in heterogeneous soils and related engineering practices.
- calcareous concretion /
- heterogeneities /
- expansive soil /
- regulation mechanism /
- quantitative characterization

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图 1 软件功能框架

Figure 1. Software functional framework

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图 2 软件界面

Figure 2. Software interface

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图 3 图像处理流程

Figure 3. Image processing flow

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图 4 “网格基准+随机偏移”方法示意图（单位：mm）

Figure 4. Schematic diagram of “mesh-based benchmark+random offset” method (Unit: mm)

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图 5 恒温加热脱湿过程

Figure 5. Constant temperature heating and dehumidification process

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图 6 土体裂隙随含水率变化演化过程

Figure 6. Evolution of soil cracks with moisture content

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图 7 裂隙量化指标随含水率变化关系

Figure 7. Relationship between crack quantification indices and moisture content

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图 8 起裂含水率和拐点含水率随异质物覆盖率变化关系

Figure 8. Relationship between the crack initiation and inflection point moisture content with heterogeneities coverage

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图 9 裂隙总长度随异质物覆盖率变化关系

Figure 9. Relationship between total crack length and heterogeneities coverage

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图 10 裂隙平均宽度随异质物覆盖率变化关系

Figure 10. Relationship between average crack width and heterogeneities coverage

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图 11 分形维数随异质物覆盖率变化关系

Figure 11. Relationship between fractal dimension and heterogeneities coverage

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表 1 土样基本物理性质指标

Table 1. Basic physical properties indexes of soil samples

天然含水率
w/% 天然密度
ρ/(g∙cm⁻³) 土粒比重
G_S 孔隙比
e 饱和度
S_r/%

19.2 2.02 2.69 0.605 86.3

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