宝鸡常兴段滑坡分布规律与发育背景

在前人工作的基础上，借助实地调查、勘查等手段，分析研究了陕西省宝鸡常兴段黄土塬边滑坡分布规律与发育背景。通过分析、研究认为：（1）宝鸡常兴段黄土塬边自西向东滑坡规模由特大型向大型、中型甚至小型渐变；（2）三级阶地缺失或三级、二级阶地同时缺失地段均有滑坡发育；（3）宝鸡常兴段黄土塬边滑坡集中发育在3个时期：晚更新世初期、全新世初期与全新世漫滩期；（4）渭河盆地西部地壳差异性向东掀斜运动形成了不同高差级别台塬的地貌格局，决定了滑坡发育规模的规律性变化；渭河北迁与侵蚀加剧造成了宝鸡常兴段黄土塬边滑坡不同时期的集中出现；（5）人类工程活动的加剧是漫滩侵蚀期新滑坡或古老滑坡复活的主要诱发因素。

DISTRIBUTION REGULARITY AND DEVELOPMENT BACKGROUND OF LANDSLIDES AT EDGE OF LOESS TABLE LAND FROM BAOJI TO CHANGXING

This paper is based on the predecessors' research and is aided with investigation and prospection at field. It analyzes the distribution regularity and development background of landslides at the edge of the loess table lands from Baoji to Changxing. It proves the following five points. (1)The scales of the landslides decrease gradually from super large to large and middle,even small.(2)Landslides are at these sites where Ⅲ terrace or both Ⅲ and Ⅱ terrace disappeared.(3)Development of landslides mainly has three periods: early stage of late Pleistocene epoch,early stage of Holocene epoch and last stage of Holocene epoch.(4)The eastward tilting movement with activity difference of the lithosphere in the west of Weihe river basin resulted in the physiognomy pattern of tablelands with distinct altitude differences. Then it controlled the development regular change of scales of the landslides. The northward movement of Weihe river and intense riverside eroding induced the concentrated development of landslides at the edge of the tablelands in different periods.(5)The intense human engineering movements are the main inducing factor of new landslides or revival of old landslides in late stage of Holocene.