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| Experiments on water erosion mechanism of weathered Pisha sandstone slope with different densities |
| ZHANG Ying, LI Xiaoli*, CHANG Ping, GUO Luomin, WU Shangyun |
| College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China |
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Abstract In order to study the water erosion mechanism of weathered Pisha sandstone and provide data reference for soil erosion control in Ordos,rainfall erosion experiments under different densities and rainfall intensities were carried out by using rainfall simulation system. The friction angle and cohesion of weathered Pisha sandstone with a density of 1.7g/cm3 were measured by a direct shear apparatus. For each slope with a particular density, the causes of infiltration runoff and erosion were revealed.The results show as follow: For the slope with a density of 1.7 g/cm3, the steady infiltration rate increases with increasing rain intensity. For the slope with a density of 1.5 g/cm3, the sensitivity of erosion due to infiltration rate is the highest. The the slope with a density of 1.6 g/cm3, the sensitivity of erosion due to cumulative infiltration depth is the highest; to the slope with a density of 1.7 g/cm3, the sensitivity of erosion due to runoff is the highest.The time-history curves of shear strength and sediment have a negative correlation.From the perspective of direct shear test and sensitivity analysis, the main cause of the erosion of 1.7 g/cm3 weathered Pisha sandstone slope is flow scouring.
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Received: 08 March 2019
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ZHANG Zhi-Hong-1, 2 , WANG Xiao-Yang-1, TONG Jin-3, 4 , LAI Qing-Hui-1, ZHANG Zhao-Guo-1, Gao-Xu-Hang-1 , STEPHEN Carr5. Quantification of micro-topographical preparation on soil erosion control on red soil slope surfaces[J]. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(8): 700-. |
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