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| 强降雨入渗非饱和细粒尾矿的渗流特征及应力响应 |
| Seepage Characteristics and Stress Response of Unsaturated Fine-grained Tailings Under Heavy Rainfall Infiltration |
| 投稿时间：2025-04-23 修订日期：2025-04-30 |
| DOI： |
| 中文关键词: 强降雨 重现期 细粒尾矿 渗流特性 孔隙水压力 有效应力 |
| 英文关键词:Heavy rainfall Return period Fine-grained tailings Seepage characteristics Pore water pressure effective stress |
| 基金项目:湖南省自然科学(2021JJ30571) |
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| 中文摘要: |
| 强降雨是影响尾矿坝安全最重要的因素之一。研究非饱和细粒尾矿的渗流特性和应力响应对于确定强降雨下溃坝的原因非常重要。建立了降雨入渗模型和数值模型,以分析20年、50年和100年重现期强降雨下细颗粒尾矿的渗流特性和应力响应。结果表明:(1)雨水渗入细粒尾矿的湿润锋深度和方式与降雨强度呈显著正相关。降雨强度越大,湿润锋的入渗速度越快。当降雨强度大于尾矿的入渗能力时,顶部尾矿将积水并逐渐饱和。(2)非饱和尾矿毛细管区的孔隙气体压力阻碍降雨入渗,尾矿饱和度越大,降雨入渗和渗流速度越快。(3)强降雨入渗降低了细粒尾矿的有效应力,其应力响应与降雨强度、持续时间和湿润锋深度密切相关。 |
| 英文摘要: |
| Heavy rainfall is one of the most important factors affecting the safety of tailings dams. It is important to investigate the seepage characteristics and stress response of unsaturated fine-grained tailings for determining the cause of dam failure under heavy rainfall. In this paper, the rainfall infiltration model and numerical model were developed in orderto analyze the seepage characteristics and stress response of fine-grained tailings under the heavy rainfall for a return period of 20, 50 and 100 years. The results demonstrate that: (1) The wetting front depth and the mode of rainfall infiltration into fine-grained tailings have a significant positive correlation with rainfall intensity. The greater the intensity of rainfall, the faster the infiltration rate of wetting front. When the rainfall intensity is greater than the infiltration capacity of the tailings, the top tailings will accumulate water and gradually saturate. (2) The pore gas pressure in capillary zone of unsaturated tailings hinders rainfall infiltration, and the greater the saturation of tailings, the faster the rates of infiltration and seepage of rainfall. (3) Heavy rainfall infiltration reduces the effective stress of fine-grained tailings, and its stress response is closely related to rainfall intensity, duration and wetting front depth. |
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