乐山市市中区平兴镇连山滑坡特征及演化过程分析  

Characteristics and Evolution Process of Lianshan Landslide in Pingxing Town,Shizhong District,Leshan City

作　　者：黄泽森 任敬 黄文 常一博 石一翔 HUANG Zesen;REN Jing;HUANG Wen;CHANG Yibo;SHI Yixiang(The 7th Geological Team of Sichuan,Leshan 614000)

机构地区：[1]四川省第七地质大队,四川乐山614000

出　　处：《四川地质学报》2024年第4期677-681,共5页Acta Geologica Sichuan

摘　　要：2020年8月,乐山市市中区普降暴雨,15~17日出现连续降雨。17日11时至18日2时雨强最大,超50 mm/h,形成超百年一遇洪灾—“8·18洪灾”,受此影响,平兴镇三圣村11组连山黄勇房屋东侧山体出现大面积滑坡。通过无人机航空摄影、现场调绘、工程地质勘探,对滑坡形貌及变形特征、岩土结构、变形过程、形成机理进行了分析研究:为地下水扬压力作用的滑动变形破坏,经历了初始蠕动变形期-等速变滑移期-加速变形滑面贯通剧滑期-停滑期;滑坡变形阶段伴随地下水扬压力发生滑坡。对四川省盆地类似近水平岩层平推式滑坡失稳机理研究有借鉴意义。In August 2020,the Shizhong District of Leshan City dropped heavy rain,with the maximum rain intensity of more than 50mm/h from 11 o 'clock on the 17th to 2 o 'clock on the 18th,forming a once-in-a-century flood-"8.18 flood".Affected by this,Pingxing Town Sansheng Village 11 Lianshan Huangyong's house on the east side of the mountain landslide.A massive landslide occurred on the Pingxing town Sansheng Village 11 group,near the Lianshan Huangyong's house east side of mountain.Through UAV aerial photography,field mapping and engineering geological exploration,the landslide morphology and deformation characteristics,rock and soil structure,deformation process and formation mechanism are analyzed.It is concluded that the sliding deformation failure under the action of uplift pressure of groundwater goes through the initial creep deformation period,the constant velocity change slip period,the accelerated deformation slide surface through the rapid slip period,and the stop slip period.The stage of landslide deformation is accompanied by groundwater uplift pressure.The results can be used as reference for the study on the instability mechanism of similar near-horizontal strata flattening landslides in Sichuan basin.

关 键 词：平推式滑坡 成因机制 破坏模式 推移式 

分 类 号：P642.22[天文地球—工程地质学]