对兰州市刘家堡断层的新认识

New Perspective for Liujiapu Fault of Lanzhou City

以往兰州市的地学界和工程学界普遍认为兰州市存在一条自安宁到桑园峡纵贯兰州市区的刘家堡断层(亦称孔家崖断层),是一条隐伏的规模较大的全新世活动断裂,因而对市区工程建设有重要影响。本文通过钻探资料及对兰州市安宁区文华嘉苑场地大探槽的开挖证实,所谓"刘家堡断层"其实为一不同岩性的接触界面。

Up to now, most of scholars work in geology and earthquake engineering considered that a very important Liujiapu fault （also named Kongjiaya fault） exists in Anning district of Lanzhou city, and maybe extends east to Sanyyuanxia across the main urban region of Lanzhou city. The fault was determined as a Holocene active fault, so it had seriously influence to the urban engineering and architectures. In recent study, through drilling at some sites along the fault lines in Anning district, especialy a large trenching study at Wenhua Jiayuan site in Anning district, we find that ＂Liujiapu fault＂ is just a interface between different terranes.