降雨诱发作用下某古滑坡变形特征及其复活机制研究
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1.中国地质大学(武汉)工程学院;2.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室;3.四川省地质矿产勘查开发局 四川省第九地质大队;4.中国电建集团贵阳勘测设计研究院有限公司

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中图分类号:

P642.22

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国家自然科学基金(42207222)


Research on Deformation Characteristics and its Resurrection Mechanism of some ancient landslide induced by rainfall
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Affiliation:

1.Faculty of Engineering, China University of Geosciences (Wuhan);2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences

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    摘要:

    受雨季连续降雨作用的影响,西昌某铁矿一方量约为1200×104m3巨型土石混合体古滑坡于2021年开始复活进入蠕滑阶段,到2022年雨季开始增速下滑,严重威胁到矿坑内部的正常开采。基于现场调查、钻探揭露、现场监测、物理力学试验,在查明古滑坡微地形、地质结构特征和变形失稳阶段的基础上,对其影响因素及复活机制进行了探究。研究结果表明,堆积岩土体及地形地貌是古滑坡复活的孕灾基础,降雨入渗作用、采矿开挖是滑坡复活的诱发因素。分析表明,受长期以来的降雨淋滤作用影响,细颗粒物质在基覆界面处进行堆积形成滑带,采矿开挖使前缘出现有效临空面,且受地下水长期影响,滑带土的强度逐渐削减,降雨导致渗流作用加剧,抗剪强度降低,从而诱发古滑坡复活。研究成果对类似工程问题具有一定的参考价值。

    Abstract:

    :Affected by the continuous rainfall in the rainy season, the ancient landslide of a giant soil-rock mixture with a volume of about 1200 × 104m3 in an iron mine in Xichang began to revive in 2021 and entered the creeping stage. By 2022, the growth rate began to decline in the rainy season, which seriously threatened the normal mining inside the pit. Based on field investigation, drilling exposure, field monitoring, and physical and mechanical tests, the influencing factors and resurrection mechanism of ancient landslides were explored on the basis of identifying the micro-topography, geological structure characteristics and deformation instability stages of ancient landslides. The results show that the accumulation of rock and soil and topography are the basis of ancient landslide resurrection, and rainfall infiltration and mining excavation are the inducing factors of landslide resurrection. The analysis shows that under the influence of long-term rainfall leaching, fine particulate matter accumulates at the base-cover interface to form a sliding zone, and mining excavation causes an effective free face at the leading edge. Under the long-term influence of groundwater, the strength of the sliding zone soil is gradually reduced. Rainfall leads to increased seepage and reduced shear strength, which induces the revival of ancient landslides. The research results have certain reference value for similar engineering problems.

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梁俊岩,王成汤,陈娱,等. 降雨诱发作用下某古滑坡变形特征及其复活机制研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-12-08
  • 最后修改日期:2024-06-20
  • 录用日期:2024-07-09
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