论文部分内容阅读
安丘—莒县断裂是沂沭断裂带内的一条重要断裂,该断裂由许多小断层斜列组成,断裂在覆盖层5~50 m之间的空间分布对工程及地表的破坏是潜在的,本文利用高密度电法探测方法,得出了探测区的电性结构,利用断层破碎带与周围岩石的电阻率差异,结合野外地质考察、探槽、浅层人工地震等方法认为:安丘—莒县断裂在昌邑市的东部通过,走向北北东,东倾,在文山东侧见该断裂出露,沿断裂错断了全新世地层,地层断距大于1.5 m;该断裂最新活动时代为全新世早期,规模较大、覆盖层较薄,破碎带较宽,又是沂沭断裂带内的主干断裂之一,从工程的安全考虑,在城市规划时建议将断裂带通过区域规划成绿地或道路,尽可能不摆放建筑物.此外在地基施工的过程中,为了尽可能避免断层造成地基失衡,需要严格遵守相关的施工规定.为今后地震安全性评价和地震区划工作奠定基础,对防震减灾具有重要意义.
The Anqiu-Juxian fault is an important fault in the Yishu fault zone. The fault is composed of many small fault diagonal columns. The spatial distribution of fractures between 5 and 50 m in the cover layer is potential for engineering and surface damage. In this paper, the high-density electrical method is used to detect the electrical structure of the exploration area. Based on the difference of resistivity between the fault zone and the surrounding rock, combined with the field geological survey, trench exploration and shallow artificial earthquake, The Yixian fault passes through the eastern part of Changyi City toward north-north east and east-easterly. The faults were exposed on the east side of Wenshan. The Holocene strata were dislocated along the faults with the fault spacing greater than 1.5 m. The latest activity time of the fault was a brand new In the early stage of the world, the scale was larger, the cover was thinner, the crushing zone was wider, and it was also one of the main faults in the Yishu fault zone. From the project safety consideration, it is suggested to pass the fault zone into green space or In the process of foundation construction, in order to avoid as much as possible the ground unbalance caused by faults, it is necessary to strictly abide by the relevant construction rules and lay the foundation for future earthquake safety assessment and seismic zoning , Is of great significance to earthquake prevention and disaster reduction.