摘要:
宁国山核桃种植区环境地质条件复杂,人类活动活跃,降雨充沛,是安徽省滑坡灾害极高易发区之一。选择种植区东部石岭村滑坡为研究对象,采用遥感、地形测量、地质勘查等工作手段,对滑坡的变形特征、形成条件、破坏机制及稳定性等特征进行详细研究,并提出防治建议。研究结果表明: 石岭村滑坡为一受基覆界面控制的小型复合式土质滑坡,在工况Ⅱ(自重+持续暴雨)下稳定系数为0.854 3(不稳定),处于蠕变状态,复活的可能性较大; 其主控因素为软弱的岩土体结构和适宜的地形地貌条件,诱发因素为强降雨和人类工程活动; 建议对种植区自然斜坡进行工程治理,同时改变山核桃采摘方式(如采用低空挂网兜拾),恢复植被,减少水土流失。研究成果可为种植区滑坡灾害早期识别和防治等提供重要借鉴。
Abstract:
Ningguo pecan planting area is one of the most vulnerable areas of landslide disaster in Anhui Province with complex environmental and geological conditions, active human activities and abundant rainfall. The landslide in Shilingun in the eastern part of the planting area was selected as the research object, and the remote sensing, topographic survey and geological exploration were adopted to investigate the deformation characteristics, formation conditions, failure mechanism and stability of the landslide in detail, and prevention and control proposals were put forword. The results show that Shilingcun landslide is a small composite soil landslide controlled by the interface of foundation and cover. The stability coefficient is 0.854 3 (stability coefficient ＜1, unstable) under condition II (dead weight + continuous heavy rain), and it is in a creep state with greater possibility of resurrection. The main controlling factors are weak rock and soil structure and suitable topographic and geomorphic conditions, and the induced factors are heavy rainfall and human engineering activities. It is suggested that the natural slopes in the planting area should be treated with engineering method, the picking pecans method should be changed (such as using low-altitude hanging net picking) to restore vegetation and reduce soil erosion. The research results could provide important reference for the early identification, prevention and control of landslide disasters in planting areas and reduce the loss of people's lives and property.
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