| 陈 昊,郭富赟.东乡县城撒尔塔广场滑坡成因机制分析[J].甘肃地质,2026,35(1):64-71 |
| 东乡县城撒尔塔广场滑坡成因机制分析 |
| GENETIC MECHANISM OF LANDSLIDE IN THE SARTA SQUARE OF DONGXIANG COUNTY |
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| DOI：10.27027/j.cnki.ISSN2097-6704.2026.01.008 |
| 中文关键词: 滑坡 成因机制 冻融作用 人工边坡 黄土高原 东乡县 |
| 英文关键词:landslide genetic mechanism freeze -thaw action artificial slope Dongxiang County Loess Plateau |
| 基金项目:中央引导地方科技发展资金项目（23ZYQA0326）；国家自然科学基金项目（42577163）。 |
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| 中文摘要: |
| 2011年3月2日发生在甘肃省东乡县县城的撒尔塔广场滑坡是一次典型的冻融期城区滑坡灾害，造成重大经济损失与社会影响。 本文基于现场调查、工程勘查与测试数据，系统分析了滑坡的地质环境、形态结构、形成过程及成因机制。 研究表明该滑坡是特殊地形地质条件、不当人工填土活动和周期性冻融作用共同耦合的结果。 人工填方改变了原始斜坡形态，堵塞地下水排泄通道，加之城市污水管道渗漏与绿化灌溉，导致坡体内地下水位持续上升。季节性冻融作用进一步通过冻结滞水、静水压力升高、融沉破坏及动水压力变化等方式，显著降低了边坡稳定性。 滑坡变形机制属蠕滑拉裂型，具有长期变形历史，冻融作用是促发整体滑动的关键诱因。 研究结果可为在西北黄土高原季节性冻土区同类滑坡的防治提供借鉴。 |
| 英文摘要: |
| The landslide occurred in Saerta Square， Dongxiang County of Gansu Province on March 2, 2011,is a typical urban landslide disaster during the freeze-thaw period which caused substantial economic losses and social impact. Based on field investigations, engineering surveys, and experimental data, this paper systematically analyzes geological environment, morphological structure, formation process, and causative mechanisms of the landslide. The study reveals that the landslide resulted from the combined effects of specific topographic and geological conditions, inappropriate artificial fill activities, and periodic freeze-thaw action. Landfilling altered the original slope morphology and blocked groundwater drainage pathways. Together with leakage from urban sewage pipelines and irrigation for greenery, these factors caused a continuous rise in the groundwater level within the slope. Seasonal freeze-thaw action further significantly reduced slope stability by mechanisms including frozenlayer water retention, increased static water pressure, thaw -induced settlement failure, and variations in hydrodynamic pressure. The landslide deformation mechanism is classified as the creep -tensile cracking type,exhibiting a long-term deformation history, with freeze-thaw action identified as the key trigger for the overall slope failure. The research findings provide valuable insights for the prevention and mitigation of similar landslides in seasonal frozen soil regions of the northwest Loess Plateau. |
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