South China Geographical Journal >
Study on Soil Physical Properties and Particle Size of Collapsing Hill in Granite Area of Xinyi City
Received date: 2023-02-26
Revised date: 2023-11-18
Online published: 2023-12-25
Collapsing hill is the most severe type of soil erosion in southern China. This study investigated the soil physical properties and particle size composition of different landforms in Gangwei Collapsing Hill, Xinyi City, and explored the changes in soil physical properties and particle size in different landforms, as well as reveals the development mechanism of collapse erosion. The results showed that: (1) There are significant differences in physical properties such as water content, bulk density, specific gravity, and porosity in soil samples from different landforms of Gangwei Collapse Hill. The soil texture of the upper collapsing wall and colluvial deposit is relatively dense and compact, and the degree of water transformation is relatively weak; the loose soil texture of soil samples from scour channel and alluvial fan indicates a strong participation of water flow. (2) The particle size composition shows that the soil sample of Gangwei collapse hill is gravel containing sandy soil. The soil samples from the collapsing wall exhibit the undisturbed soil characteristics of the weathered granite crust, while the soil samples from the colluvial deposit are the product of the combined erosion of gravity and hydraulic forces, while the soil samples from channel and alluvial fan exhibit sedimentary characteristics dominated by flowing water. (3) The uniformity coefficient and curvature coefficient indicate that the accumulation time of collapsed soil is relatively short. The development age of the collapsing hill is relatively young, and the geomorphic form and vegetation coverage of the collapsing hill also indicate that it is in the stage of development.
Key words: collapsing hill; soil physical properties; particle size; weathered crust
HUANG Rihui , LI Yixin . Study on Soil Physical Properties and Particle Size of Collapsing Hill in Granite Area of Xinyi City[J]. South China Geographical Journal, 2023 , 1(3) : 92 -100 . DOI: 10.20125/j.2097-2245.202303008
表1 岗尾崩岗土体物理性质Tab.1 Physical properties of colluvial soil mass at Gangwei collapsing hill |
| 采样点编号 | 含水率/% | 容重/(g·cm-3) | 比重/(g·cm-3) | 孔隙度/% |
|---|---|---|---|---|
| 1 | 20.22 | 1.61 | 2.70 | 40.37 |
| 2 | 20.85 | 1.63 | 2.64 | 38.26 |
| 3 | 21.47 | 1.62 | 2.68 | 39.55 |
| 4 | 20.46 | 1.61 | 2.66 | 39.47 |
| 5 | 20.23 | 1.60 | 2.63 | 39.16 |
| 6 | 20.15 | 1.59 | 2.64 | 39.77 |
| 7 | 9.78 | 1.47 | 2.60 | 43.46 |
| 8 | 6.72 | 1.41 | 2.60 | 45.77 |
| 9 | 8.87 | 1.48 | 2.62 | 43.51 |
| 10 | 11.01 | 1.48 | 2.63 | 43.73 |
| 11 | 11.48 | 1.49 | 2.62 | 43.13 |
| 12 | 10.60 | 1.46 | 2.63 | 44.49 |
表2 岗尾崩岗土体颗粒特征Tab.2 Grain characteristics of soil mass at Gangwei collapsing hill |
| 采样点编号 | 中值粒径d 50/mm | 不均匀系数Cu | 曲率系数Cc |
|---|---|---|---|
| 1 | 1.141 | 10.43 | 1.53 |
| 2 | 1.282 | 10.13 | 1.78 |
| 3 | 1.270 | 12.31 | 2.16 |
| 4 | 1.168 | 17.11 | 1.80 |
| 5 | 1.109 | 25.00 | 1.60 |
| 6 | 1.066 | 24.67 | 1.08 |
| 7 | 1.138 | 7.42 | 1.53 |
| 8 | 1.127 | 5.96 | 1.47 |
| 9 | 1.106 | 6.48 | 1.43 |
| 10 | 1.173 | 8.47 | 1.89 |
| 11 12 | 1.174 1.185 | 8.11 8.11 | 1.66 1.76 |
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