Effects of Rock Fragments on Characteristics of Surface Shrinkage Cracks in Calcareous Soil

Wang Xing; Xu Qinxue; Lai Benzhong; Zhang Shuaipu; Gan Lei

doi:10.13961/j.cnki.stbctb.2020.03.004

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Effects of Rock Fragments on Characteristics of Surface Shrinkage Cracks in Calcareous Soil

- Effects of Rock Fragments on Characteristics of Surface Shrinkage Cracks in Calcareous Soil
- Bulletin of Soiland Water Conservation Vol. 40, Issue 3, Pages: 20-26(2020)
- 作者机构：
  
  1. 桂林理工大学广西环境污染控制理论与技术重点实验室科教结合科技创新基地,广西,桂林,541004
  2. 桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心,广西,桂林,541004
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2020.03.004
  CLC： S152.2
- Published：2020
- 稿件说明：
移动端阅览
Wang Xing, Xu Qinxue, Lai Benzhong, et al. Effects of Rock Fragments on Characteristics of Surface Shrinkage Cracks in Calcareous Soil[J]. Bulletin of Soiland Water Conservation, 2020, 40(3): 20-26.
DOI：

Wang Xing, Xu Qinxue, Lai Benzhong, et al. Effects of Rock Fragments on Characteristics of Surface Shrinkage Cracks in Calcareous Soil[J]. Bulletin of Soiland Water Conservation, 2020, 40(3): 20-26. DOI： 10.13961/j.cnki.stbctb.2020.03.004.

摘要

[目的] 研究砾石粒径及含量对石灰土表面干缩裂隙发育特征的影响，为探索喀斯特地区的水土流失机理提供参考依据。[方法] 通过室内模拟试验和数字图像处理技术，研究了砾石粒径（2.0~5.0 mm和5.0~12.5 mm）和砾石含量（0%，10%，20%，30%，40%）条件下的石灰土表面干缩裂隙特征。[结果] ①无砾石石灰土平均表面裂隙率仅为3.03%，含砾石石灰土具有更大的表面裂隙率，在大粒径（5.0~12.5 mm）高含量（40%）条件下，表面裂隙率最大，达到8.66%；②当砾石含量增加时，裂隙的形态变得细小且密集，小粒径砾石会使裂隙网络更复杂；③大粒径（5.0~12.5 mm）条件下的土壤表面裂隙率与砾石含量成正线性相关，而小粒径（2.0~5.0 mm）条件下的裂隙率与砾石含量成负线性相关；④砾石会成为裂隙发育的基点，每个砾石颗粒周围都有可能产生围绕砾石或是向外延伸的裂隙。且在砾石形态的棱角处，容易产生向外延伸的裂隙。[结论] 石灰土中存在砾石会导致表面裂隙率提高，弱化土体的抗侵蚀能力，是石漠化治理不容忽视的问题。

Abstract

[Objective] The effects of rock fragment (RF) size and content on the development characteristics of surface shrinkage cracks in calcareous soil were studied to provide a reference basis for exploring the mechanism of soil erosion in karst areas.[Methods] RF size (2~5 and 5~12.5 mm) and RF content (0%

10%

20%

30%

and 40%) were controlled

and digital-image-processing technology was used to study the effect of RFs on surface crack development in calcareous soil.[Results] ① The surface crack rate (SCR) of the calcareous soil without RFs was only 3.03%

whereas the samples with added RFs had a larger SCR. The maximum SCR of sample (5~12.5 mm

40%) reached 8.66%. ② When RF content increased

the morphology of the crack network became small and dense

and small RFs made the crack network more complex. ③ The SCR of 5~12.5 mm RFs was positively correlated with the RF content

whereas the SCR of 2~5 mm RFs was negatively correlated with the RF content. ④ RFs can become the basis of fracture development

and each RF probably produce fracture around the RF or extend the crack network. Moreover

at the corner of an RF

it was easy to produce cracks extending outward.[Conclusion] The existence of RFs in calcareous soil could lead to the increase of the SCR and weaken the resistance of soil to erosion.

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