Test on rainfall erosion of loess slope and its simulation by PFC3D(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年06期
- Page:
- 1-8
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Test on rainfall erosion of loess slope and its simulation by PFC3D
- Author(s):
- WU Qian; WANG Chang-ming; LI Tong-lu; MAO Xue-song
- 1. School of Highway, Chang’an University, Xi’an 710064, Shaanxi, China; 2. College of Construction Engineering, Jilin University, Changchun 130026, Jilin, China; 3. School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, Shaanxi, China
- Keywords:
- road engineering; loess slope; rainfall erosion; water-soil coupling; PFC3D
- PACS:
- U416.169
- DOI:
- -
- Abstract:
- To study the rainfall erosion characteristics and its evolution mechanism of loess slope in highway engineering. Taking loess slope in western Liaoning as the research object, physical model test was conducted in laboratory. Moisture content of slope soil during rainfall was monitored and migration law of wetting front in slope was analyzed. Based on the test results and water-soil coupling theory, the rainfall erosion process of slope was simulated by PFC3D, and the void ratio in different positions of slope during rainfall erosion, water flow rate and the distribution and changing process of particle average moving rate were obtained. The results show that the infiltration area at slope toe is larger than the other positions, and with the rainfall this trend is more and more obvious. The evolution of erosion process can be generally concluded as splash and sheet erosion, rill erosion, gully erosion and finally evolved into collapse. The collapse was retrogressively developing upwards, until the slope completely destroyed. Loss of particles and the water flow rate both increased from the top of the slope to the slope toe as the erosion progressed. With the particles sliding, there will be local peaks on the water flow rate curve, and particle moving in each fluid unit exhibited similar variation characteristics with the water flow rate. These parameters obtained from PFC3D simulation the distribution of erosion capacity of water flow and soil erosion intensity in slope, the erosion capacity of water flow was increasing from top to toe of the slope, and the soil erosion intensity at toe of the slope was the most serious place, which was consistent to the result of laboratory model test, also was a supplement for model test on meso perspective.
Last Update: 2017-12-18