Abstract: Shabanliang ridge is a new uplift in the middle part of Datong basin and lies in an extensional environment.It is NE-trending and 60km long.Its bed rock is gneiss and is covered with Quaternary unconsolidated sedimentary layers,which include clay layers,fine-coarse sand layers gravel layers and loess layers.On the Shabanliang ridge there is a series of active normal faults in these unconsolidated layers.After field investigation,mechanical experiments in field and in laboratory to simulate behavior of active faults,the characeristics and types of the active structures on Shabanliang uplift are studied in this pater.The active sturctures,especially their extra ordinary pressentation forms in Quaternary unconsolidated sedimentary layers,are studied in detail,in order to find effective identification markers of active faults in Quaternary unconsolidated sedimentary layers.There are two kinds of active faults in general:visible and non-visible faults.The visible active faults can be divided into three types and the non-visible active faults can be recognized into four types.The difference between different types of faults is due to the difference in quality of sedimentary layers and forcing mode.By simulation experiments the influence of forcing mode (forcing slowly and rapidly) on sedimentary layers is analysed.These are very important to determine the most recent rupture time of active faults and how they are distributed in unconsolidated layers.By more precisely justifying the latest faulting,we can find the cycle of paleoseismic events more accurately and hence to evaluate the earthquake risk in engineering geology and to predict the possibility of earthquak.

Key words: Faulting, Mechanical, simulation, Quaternary

摘要： 通过野外实地考察、野外现场力学实验及室内力学实验模拟断裂的新活动,来研究砂板梁新隆起的活动构造特征和类型。旨在从实验模拟与野外实践相结合的基础上,对活动构造,特别是对断裂新活动在第四纪松散沉积层中特殊的表现形式进行研究,寻找第四纪松散沉积层中断裂新活动的有效识别标志,这是准确判定断裂新活动的关键,对工程地质评价及区域性地震危险性分析有很好的实用价值。

关键词: 断层活动, 力学模拟, 第四纪