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| Numerical model for open-pit mine slope considering stochastic field of saturation permeability |
| Received:October 11, 2021 Revised:December 22, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20211011002 |
| KeyWord:open-pit slope stochastic field unsaturated seepage rainfall infiltration FISH |
| Author | Institution |
| 张华宾 |
辽宁工程技术大学 力学与工程学院, 阜新 |
| 张顷顷 |
辽宁工程技术大学 力学与工程学院, 阜新 |
| 王来贵 |
辽宁工程技术大学 力学与工程学院, 阜新 |
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| Abstract: |
| It is widely known that the spatial variability of the mechanical properties of rock mass exists and that rainfall induces a decrease in matric suction which in turn affects the process of infiltration into an unsaturated slope.Therefore, it is necessary to analyze the effects of the rainfall infiltration and the spatial variability of permeability on the seepage field and the factor of safety of a slope.This paper intends to explore the nonlinear flow characteristics of a high and steep rock slope.Based on the unsaturated seepage theory and the stochastic field theory, rectified functions that take into account saturation, permeability and matric suction for unsaturated slope were programmed by using fish, a saturated-unsaturated stochastic seepage field model established by using the non-intrusive stochastic method.The results show that the modified saturated-unsaturated seepage stochastic field model can accurately describe the behavior of an open-pit mine slope suffering from rainfall infiltration.Rainfall infiltration mainly affects the shallow seepage field of the rock slope.With the change of duration of rainfall, an enclosed and gradually shrinking unsaturated zone is formed between the slope surface and the groundwater level.The transient saturated zone appears at the surface of slope earliest and its thickness increases gradually, but the increase slows down gradually.At the same time, the pore water pressure at the surface of slope reaches the value of zero at the earliest time, and it takes a long time for the point far away from the surface of slope to reach the value of zero.The conclusion can provide a reference value for the prediction of the geological disaster of an open-pit slope. |
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