| 石振明,熊曦,彭铭,林铭郎.存在高渗透区域的堰塞坝渗流稳定性分析——以红石河堰塞坝为例[J].水利学报,2015,46(10):1162-1171 |
| 存在高渗透区域的堰塞坝渗流稳定性分析——以红石河堰塞坝为例 |
| Stability analysis of landslide dam with high permeability region: A case study of Hongshihe landslide dam |
| 投稿时间：2015-05-21 |
| DOI：10.13243/j.cnki.slxb.20150577 |
| 中文关键词: 堰塞坝 高渗透区域 红石河堰塞湖 渗流 管涌 稳定性 ABAQUS |
| 英文关键词: landslide dam high permeable region Hongshihe Landslide Lake seepage piping stability ABAQUS |
| 基金项目:国家自然科学基金项目(41372272,41402257);上海市科研计划项目(14PJ1408200) |
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| 中文摘要: |
| 堰塞坝是由滑坡体土石材料快速堆积而成,没有经过充分固结,坝体结构松垮、组成物质松散,材料分布极不均匀,局部很可能存在由大颗粒组成的高渗透区域,在堰塞湖蓄水的高水头作用下可诱发渗流破坏(如管涌),进而导致坝体失稳。本文以汶川大地震中形成的红石河堰塞坝为例,通过分析高渗透区域对红石河堰塞坝渗流特性的影响规律,提出一种考虑高渗透区域存在的堰塞坝渗流稳定分析方法。该方法将渗流失稳定义为管涌和边坡失稳的循环发展过程,并针对土体材料和水力学参数设置管涌和边坡失稳临界条件用于判断渗流失稳发展情况。通过对红石河堰塞坝的分析发现,高渗透区域的存在对堰塞坝的渗流稳定是不利的。高渗透区域越长、渗透性越高、其位置越靠近坝体下游坡脚,堰塞坝的渗流稳定性越差。由于红石河堰塞坝坝宽坡缓,高渗透性区域的存在可引发局部管涌,但不会发生管涌及边坡失稳破坏;当坝顶宽度较小、下游边坡比较大时,坝体发生管涌和失稳连续破坏,最终导致漫顶溃坝。 |
| 英文摘要: |
| Landslide dams, which often formed by quick deposits of landslide materials, are lack of suffi-cient consolidation, and loose in dam structure and material composition. Especially, the soil and rock ma-terials are highly heterogeneous, comprising high permeable regions with large particles. The presence of high permeable regions may lead to internal erosion or even piping failure under high water pressure. Tak-ing the Hongshihe landslide dam triggered by the Wenchuan earthquake as an example, the paper provides a method to analyze the stability of landslide dams under seepage by considering the influence of high per-meable regions. The instability of a landslide dam under seepage is defined as a circulatory process of inter-nal erosion and slope failure. The critical conditions of internal erosion and slope failure are identified with-in this method. From the seepage stability analysis of the Hongshiyan landslide dam with the present meth-od, it is found that the presence of highly permeable region does harm to seepage stability of landslide dams. The seepage stability becomes worse with longer high permeability region, higher permeability, and smaller distance to the dam downstream toe. The Hongshiyan landslide dam with high permeable regions is likely to occur internal erosion, but piping failure is not likely due to large dam width and gentle down-stream slope. Piping failure occur when the dam crest width is shorter and downstream slope gradient is larger. |
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