| In accordance with dumped along the slope spoilbank is one of the most serious erosion damage deposit types. It generally exists in the tunnel excavation of railway and highway construction, mountain development projects implement. In the conduction of project, plentiful waste dumped along the slope spoilbank with the mechanical power. The top of slop dumped stack body can produce serious erosion and debris flow. For slope gully dumped stack body, erosion is serious that there is a large area for collect water. This study applied artificial simulation of rainfall in slope dumped stack body, and adopted scouring experiment for slope gully dumped stack body. Our target is to reveal the erosion regulation and mechanism of the dumped along the slope spoilbank. Draw the following conclusions:(1) For slope dumped stack body, relationship between runoff producing time of slope dumped stack body and the rainfall intensity is showed a significant negative correlation. With the increasing of rock content and slop gradient, runoff time was increasing. Runoff rate has a power function relation with rainfall intensity, and has a negative exponential function with slop gradient. When rock content increased from 0% to 40%, runoff rate decreased. With the rock content continue increase to 60%, runoff rate increased.(2) The fluctuant of erosion rate is increasing with the increase of rainfall intensity, and there is a linear relation between them. With the increase of slop gradient, erosion rate and the range of its fluctuant is increasing. Their relation is a power trend. In a small rainfall intensity, erosion rate is increasing with the rock content increase at the first stage of rainfall. Reached to a turning point, erosion rate become rise with the increase of rock content, and the difference is large that erosion rate in 0% rock content is much larger than 40% and 60% rock content. In a large rainfall intensity, erosion rate is decrease with the increase of rock content. There is a linear relation between erosion and runoff amount.(3) For slope gully dumped stack body, runoff rate has a trend during the rainfall process that grow up slowly in first stage, then become stability. The relation of average runoff rate and flow rate is a positive linear, and a negative linear with rock content. Also, the average runoff rate has a positive correlation to slop gradient.(4) The trend of erosion rate is rise up quickly at first stage and then become a fluctuant stable stage during the rainfall process in a condition of small gradient and small rock content. When the condition changed to large gradient and large rock content, the trend is decrease in first stage and then into a stability stage. There is a positive power relation between the average erosion rate and flow rate. With the increase of slop gradient and the decrease of rock content, erosion rate become larger. In the first stage of scouring, erosion rate is increasing with the increase of rock content, to a turning point, the trend reversed. The positive and negative influence of rock content for erosion rate is in a range of 40% to 60%.(5) The trend of relation for erosion amount and runoff amount is similarity that the variance affected by flow rate, rock content and slop gradient. And there is a power relation between erosion amount and runoff amount. |
