表层岩溶裂隙带土壤地表流失/地下漏失室内模拟实验

闫钇全; 刘琦; 邓大鹏; 王涵

doi:10.11932/karst20220206

表层岩溶裂隙带土壤地表流失/地下漏失室内模拟实验

doi: 10.11932/karst20220206

闫钇全^{1, 2},
刘琦^{1, 2, ,},
邓大鹏^{1, 2},
王涵^{1, 2}

1.
同济大学土木工程学院地下建筑与工程系，上海 200092
2.
岩土及地下工程教育部重点实验室(同济大学)，上海 200092

基金项目: 国家自然科学基金资助项目（41772292）；国家重点研发计划（2016YFC0502603）

详细信息

作者简介:
闫钇全（1997－），男，硕士研究生，主要从事水文地质工程地质方面的研究

通讯作者:
刘琦（1980－），女，博士，副研究员，主要从事水文地质工程地质方面的教学和研究。E-mail：liuqi472@163.com

中图分类号: S157
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出版历程
- 收稿日期: 2021-02-25
- 刊出日期: 2022-07-28

Laboratory simulation study on soil surface loss and underground leakage in the epikarst fissure zone

YAN Yiquan^{1, 2},
LIU Qi^{1, 2
, ,},
DENG Dapeng^{1, 2},
WANG Han^{1, 2}

1.
Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, China

摘要

摘要: 以表层岩溶裂隙带为研究对象，采用室内模拟降雨的方法，通过控制降雨强度、坡度、裂隙宽度、裂隙产状，研究其对土壤地表流失、地下漏失的影响。结果表明：（1）土壤地表流失主要受降雨强度和坡度的影响，土壤地表流失量随降雨强度的增大而增大、随坡度的增大而增大，30°坡面土壤地表流失量最高。（2）土壤地下漏失主要受裂隙宽度、产状和坡度的影响，对降雨强度的响应不明显；土壤地下漏失量与裂隙宽度大小呈正相关关系，裂隙走向与坡面走向呈30°时最容易发生土壤地下漏失；坡度与土壤地下漏失的发生呈负相关关系；伴随降雨，土壤地下漏失速率变化幅度较大，漏失速率先增加后减小直至停止。无落水洞、漏斗等管道的岩溶坡面土壤流失的主要形式是地表流失，而土壤地下漏失的主要通道是落水洞、漏斗等大型岩溶管道，土壤地下漏失对土壤流失的总贡献率小于5%。
- 岩溶 /
- 模拟实验 /
- 土壤地表流失 /
- 土壤地下漏失
Abstract: The study area, Guanling-Zhenfeng Huajiang demonstration area of karst plateau canyon, covers 51.62 km² with the karst area of 45.39 km². It is a typical area of karst plateau canyon on the Guizhou plateau with an elevation difference between 370 and 1,355 meters. In this study, a simulation device was developed by researchers to investigate soil surface loss and underground leakage in the epikarst fissure zone. By simulating indoor rainfall and controlling the rainfall intensity, slope, fracture width and fracture occurrence, a 90-minute experiment was carried out to probe into the influence of soil surface loss and underground leakage. During the experiment, the data such as run-up time of underground leakage, water and soil surface loss and underground leakage was obtained every 4 minutes. EXCEL 2016 was used for statistical analysis of the data, and Origin 2017 for mapping.Results show that soil surface loss is mainly affected by rainfall intensity and slope. The lose increases with the intensifying of rainfall and the rising of slope, reaching the highest at 30° slope gradient. Besides, soil underground leakage is mainly affected by fissure width, occurrence and slope, but not obviously affected by rainfall intensity. The leakage is positively correlated with the fissure width, and most likely to occur when the fissure direction is 30° to the slope direction. The slope gradient is negatively correlated with the occurrence of soil underground leakage. During the rainfall, the underground leakage rate changes greatly, experiencing a decrease after an increase and finally reducing to 0. Surface loss is the main form of soil loss on the karst slope without sinkholes and funnels, and soil underground loss contributes less than 5% of the soil loss. Large karst pipelines such as sinkholes and funnels are the main channels of soil underground leakage. These experimental results can provide theoretical reference to the control of soil and water loss as well as the ecological restoration of karst sloping land in southwest China.
- karst /
- simulation experiment /
- soil surface loss /
- soil underground leakage

HTML

图 1 研究区地理位置分布图

Figure 1. Location map of the study area

下载: 全尺寸图片幻灯片

图 2 土壤流失室内模拟装置模型图

Figure 2. Model diagram of indoor simulation device of soil loss

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图 3 降雨强度和坡度对土壤地表流失的影响

Figure 3. Effect of rainfall intensity and slope gradient on soil surface loss

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图 4 降雨时长与土壤地表流失速率的关系

Figure 4. Relationship between the rate of soil surface loss and rainfall duration

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图 5 降雨时长对地表流失的影响

（降雨强度80 mm·h⁻¹，裂隙宽度5 cm，裂隙走向与坡面走向成90°）

Figure 5. Effect of the rainfall duration on soil surface loss

(rainfall intensity: 80 mm·h⁻¹; fissure width: 5 cm; fissure direction to slope direction: 90°)

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图 6 裂隙宽度、坡度对水土地下漏失的影响

Figure 6. Effects of fissure width and slope gradient on underground leakage of water and soil

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图 7 裂隙走向对水土地下漏失的影响

Figure 7. Effect of fissure direction on underground leakage of water and soil

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图 8 降雨时长与土壤地下漏失速率的关系

Figure 8. Relationship between the rate of soil underground leakage and rainfall duration

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表 1 实验土样物理性质

Table 1. Physical properties of soil samples

取样深度/cm 含水量/% 密度/g·cm⁻³ 液限/% 塑限/% 塑性指数/% 天然孔隙比

10~15 10.9 1.31 54 36 18 1.165

下载: 导出CSV

表 2 实验条件的设置

Table 2. Test conditions

实验条件实验设置

坡度/° 5、10、20、30
降雨强度/mm·h⁻¹ 40、60、80
裂隙宽度/mm 5、10、20
裂隙走向/° 0、30、60、90

下载: 导出CSV

表 3 不同降雨强度和坡度情况下的实验条件

Table 3. Test conditions under different rainfall intensities and slopes

实验条件实验设置

坡度/° 10、20
降雨强度/mm·h^-1 40、80
裂隙宽度/mm 5
裂隙走向/° 90

下载: 导出CSV

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