| 摘要: |
| 为探究软弱夹层对矿山高边坡降雨渗流特性的影响,以典型的石灰石矿山高边坡为例,结合工程实际,建立了含缓倾软弱夹层矿山高边坡的降雨渗流模型；基于饱和-非饱和渗流理论,模拟边坡在最大降雨量下降雨和雨后两个时间段雨水的浸润过程,揭示了边坡孔隙水压力的动态变化规律。研究结果表明：软弱夹层作为一种隔水层,改变了降雨浸润曲线的形态及其渗流路径；在降雨和雨后两个时间段,上部裂隙岩体的孔压先增大后减小,但始终为负值；软弱夹层上表面会产生雨水积聚,孔压先增大到正值随后逐渐减小,孔压的减小时间相对于降雨时长具有滞后性；坡脚的孔压在降雨和雨后两个时间段始终在增大。研究结果可为揭示类似地质条件下边坡的降雨渗流规律提供有益参考。 |
| 关键词: 矿山高边坡 软弱夹层 降雨渗流 孔隙水压力 |
| DOI： |
| 分类号:TU432 |
| 基金项目:国家自然科学基金资助项目(41672317,U1802243)；湖北省技术创新重大专项(2017ACA184)；武科大重大科技项目培育类创新团队(2018TDX01) |
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| Rainfall Seepage Characteristics of Open-pit High Slopes with Gently-inclined Soft Interlayers |
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LIU Yang, HU Bin, SHENG Jianlong, LI Jing, CUI Kai
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School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan
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| Abstract: |
| To explore the influence of soft interlayers on rainfall seepage characteristics of open-pit high slope, taking the high slope of typical limestone mine as an example, combining engineering practice, establish the open-pit high slopes with gently-inclined soft interlayers rainfall seepage model; based on the saturated-unsaturated seepage theory, simulate the infiltration process of rain at two time periods of rainfall and after rainfall under maximum rainfall conditions, reveal the slope dynamic change law of pore water pressure. The results show that the soft interlayer, as a water-blocking layer, changes the shape of seepage line and seepage path of rainfall. During the two periods of rainfall and after rain, the pore pressure of the upper fractured rock mass first increases and then decreases, but is always negative. Rainwater accumulation will occur on the surface of the soft interlayer and the pore pressure first increases to positive value and then gradually decreases. The time of pore pressure reduction is hysteresis relative to the duration of rainfall. while the pore pressure at the foot of the slope always increases in two time periods of rain and after rain. The research results can provide a reference for revealing the law of rainfall seepage in slope under similar geological conditions. |
| Key words: Open-pit high slopes, Soft interlayers, Rainfall seepage, Pore water pressure |
