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| 基金项目：中国地质调查局项目“乌蒙山北部城镇地质灾害调查”二级项目“四川古蔺县典型地质灾害及隐患勘察”（12120101000015003-03） |
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| 摘要： |
| 赤水河岸古崩滑堆积体上地质灾害频发，严重威胁岸坡城镇人民的生命财产安全。在古滑坡基础上复活的碎石土滑坡地质结构复杂，降水和扰动下滑坡体的失稳破坏方式不均，滑坡稳定状态的判别与关键防治部位的识别是防治的难点。以二郎场镇碎石土滑坡为研究区，通过航空测量、地面调查、高密度电法、山地工程、取样试验等方法，查明滑坡的地质结构特征，结合室内试验和Geo-Slope软件数值模拟分析滑坡的变形趋势，并用传递系数法验证滑坡的稳定性。结果表明：该滑坡体具多元结构，存在浅层、深层滑面，滑坡局部已蠕滑变形，该滑带土由厚度不均的含碎石粉质黏土组成，滑坡的浅部变形如不及时防治会引发深部整体滑坡失稳；滑坡处于稳定—基本稳定状态，结合既有防治工程和滑坡体特征，中上部浅层滑体需完善截排水系统，下部深层滑体采用锚索抗滑桩防护。研究成果可为岸坡城镇碎石土古滑坡地质灾害风险防控提供依据。 |
| 关键词：赤水河岸 碎石土滑坡 多元结构 Geo Slope 稳定性 防治措施 四川古蔺二郎场镇 |
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| Abstract: |
| Frequent geological disasters on ancient colluvial-landslide deposits along the Chishui River banks severely threaten lives and property in riverside. Reactivated gravel-soil landslides originating from ancient landslide masses exhibit complex geological structures. Their instability and failure modes under rainfall and disturbances are highly heterogeneous, making stability assessment and identification of critical mitigation zones major challenges. This study focuses on the gravel-soil landslide in Erlangchang Town. Through aerial photogrammetry, field surveys, high-density electrical resistivity tomography, trenching, and sampling tests, the geological structure of the landslide was clarified. Laboratory tests and numerical simulation using Geo-Slope software were employed to analyze its deformationtrend, while the transfer coefficient method was applied to evaluate its stability. The results reveal that the landslide body has a heterogeneous structure with both shallow and deep potential slip surfaces. Localized creep deformation has been observed. The slip zone consists of silty clay with unevenly distributed gravels. If not addressed promptly, shallow deformation may trigger the instability of the entire deep-seated landslide. The landslide is currently in a stable to basically stable state. Based on existing mitigation measures and landslide characteristics, it is recommended to improve the surface drainage system in the middle upper section for the-shallow slide mass and to employ anchor reinforced anti slide piles to stabilize the deep-seated slide mass in the lower section. This study provides a basis for risk prevention and control of similar ancient riverside gravel soil landslides. |
| Keywords:Chishui River bank gravel-soil landslide heterogeneous structure Geo-Slope stability prevention and control measures Erlangchang Town, Gulin County, Sichuan |
| 魏再红， 龚斌， 焦海洋， 等.赤水河岸典型碎石土滑坡结构特征和稳定性分析：以四川古蔺二郎场镇碎石土滑坡为例[J].地质学刊,2026,50(1):86-92 |
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