基于详细的野外调查, 对汶川县雁门乡雁洛村发育的大型堆积体的基本特征、形成及演化过程进行较深入研究, 结果表明: 雁洛堆积体为残坡积、崩坡积、类黄土堆积以及滑坡堆积等 4 部分组成的复合堆积, 平面上可分 2 个 大区、6 个次级区; 结合侧缘基岩变形迹象以及 UDEC 数值模拟对滑坡的形成机制进行分析, 其变形破坏模式为弯 曲2拉裂模式; 雁洛堆积体演化经历早更新世宽谷期黄土堆积阶段, 中、晚更新世峡谷期谷坡卸荷变形阶段, 峡谷区 滑坡形成阶段, 全新世堆积体复活变形阶段等 4 个阶段。

The basic characteristics, formation, and evolution process of the large-scale accumulations developed in Yanluo Village , Yanmen Tow nship, Wenchuan County are studied based on detail field investig ations. The results show that: Yanluo depos it is a complex origin deposit that made up of residual and slope deposit, colluvium, loess like and landslide deposit , and it can be divided into two zones and six sub-zones; the failure modes of the evolution process of Yanluo depo sit are " bend-crack" which is simulated by UDEC so ftware; The 4 evolution phases of Yanluo deposit may be summarized as loess accumulation stage in early Pleistocene, unloading and deformation stage in middle-late Pleistocene, landslide formation stage, deposit reactivated and defo rmation stage in Holocene, respectively

国家重点研发计划( 2017YFC1501000) ; 国家自然科学基金( 41877235) ; 国家创新研究群体科学基金( 41521002) ; 地质灾害防治 与地质环境保护国家重点实验室自主课题基金 ( SKLGP2015Z001)