Abstract: This paper deals with thrust activity and seismogeologic background at the engineering site. These thrusts occurred in the Yinzhi-Yanshan epoch. The data on test trenches reveal that these thrusts have had not any activity since the late Pleistocene. Analysis of the data on topography around the site shows that these thrusts have had not any activity since the late middle Pleistocene. This site is available to engineering construction in the presence of fault activity.Recent topographic data are useful for identification of fault activity.

Key words: Karst, Terrace, Denudated planation surface Test trench, Fault activity, Topographic surface

摘要： 本文述及场地断层活动性与地震地质背景的问题。工程场地内存在若干条印支—燕山期逆断层。对探槽揭露的断层分析表明,这些断层自晚更新世以来未发生新活动。同时对场地及附近地区层状的夷平面、喀斯特溶洞及河谷侵蚀一堆积阶地等现代地形,进行地貌调查、第四纪地层分析和相应的计算,进而认为,这些断层自晚中更新世以来未发生新活动。因此,就断层活动性而论,该场地是适于工程建设的。现代地形资料可资鉴定断层活动性。

关键词: 溶洞, 阶地, 剥夷面, 地形面, 探槽和断层活动性