| 表层岩溶裂隙带土壤地表流失/地下漏失室内模拟实验 |
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| 引用本文： | 闫钇全,刘琦,邓大鹏,王涵.表层岩溶裂隙带土壤地表流失/地下漏失室内模拟实验[J].中国岩溶,2022,41(2):240-248. |
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| 作者姓名： | 闫钇全 刘琦 邓大鹏 王涵 |
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| 作者单位： | 1.同济大学土木工程学院地下建筑与工程系，上海 200092 |
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| 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） |
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| 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%。
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| 关 键 词： | 岩溶 模拟实验 土壤地表流失 土壤地下漏失 |
| 收稿时间： | 2021-02-25 |
Laboratory simulation study on soil surface loss and underground leakage in the epikarst fissure zone |
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| Institution: | 1.Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China2.Key Laboratory of Geotechnical and Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, China |
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| 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. |
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