中文摘要：

在城市建设中,开挖和填方是两种最主要的人类工程活动,同时也是城市建设过程中地质灾害形成的主要外在因素,加剧了城市地质灾害的发生频率。在对宜昌市猇亭区地质灾害调查的基础上,以魏家湾滑坡为典型实例,重点探讨了人类工程活动与城市地质灾害之间的因果关系,指出人工填土是滑坡形成的主要原因。在此基础上对滑坡进行了破坏机理分析和后期稳定性以及泥石流危险评价。结果表明：魏家湾滑坡今后发生整体破坏的可能性较小,前缘发生再次破坏的可能性也较小,后缘发生局部破坏的可能性较大;泥石流危险度计算值为0.434,属于中度危险,在后期演化过程中有较大可能发生坡面泥石流。

英文摘要：

In urban construction,excavating and filling,two main engineering activities,are the main external factors for geological disasters,which increased the urban geological disasters frequency. Based on the investigation of geological disasters in Xiaoting District of Yichang,and taking Weijiawan landslide as a typical example,we discuss the causal relationship between engineering activities and urban geological disasters,and point out that filling is the main cause for the landslide. On this basis,the risk degree of debris flow,the failure mechanisms of the landslide are analyzed and its stability in future is evaluated. The results show that overall failure or re-occurrence of partial failure at the leading edge of the landslide is slightly possible,but partial failure at the tail edge is high possible; the calculated risk degree of debris flow is 0.434,posing a medium danger,which means that there is a high possibility of slope debris flow in future.