长江科学院院报2018，Vol.35Issue(3)：79-84,6.DOI:10.11988/ckyyb.20171080
阿尔泰山山前活动断裂带内现今地应力状态及稳定性分析
Current In-situ Stress State and Stability of Active Fault Zone in Piedmont of Altai Mountains
摘要
Abstract
There is an active tectonic zone in large scale in Altai region of the Asian continent,and historical earth-quake data shows that the Altai Mountain is also active in seismicity. Analyzing the current stress state is of great significance to the assessment of earthquake activity risk. In this research, the distribution law of current in-situ stress state in the active fault zone is revealed by hydraulic fracturing measurement at two boreholes(nearly 700 m in depth) in the piedmont of Altai Mountains. Results show that in buried depth of about 320 m,the spatial princi-pal stress state changes from thrust type to strike-slip type,indicating a stress partition near the active faults;the o-rientation of maximum horizontal principal stress of the two boreholes is mostly in NW,which,together with the fo-cal mechanism,verifies the right-lateral strike-slip characteristics of NWW active faults. Finally, according to the measured stress data,mechanical analysis on the stability of the active faults is carried out based on Coulomb faul-ting criterion and the law of Byerlee.Results conclude that up until now,the active faults in the piedmont of the Al-tai Mountains are relatively stable,with no mechanical condition brewing instability. The research results offer basic geomechanics data for studies on the regional active faults' current activity,and provide scientific reference for se-lecting the location of engineering project near the active faults.关键词
阿尔泰山/活动断裂/地应力/Byerlee定律/稳定性Key words
Altai Mountains/active fault/in-situ stress/the law of Byerlee/stability分类
建筑与水利引用本文复制引用
周春华,李云安,尹健民,汪洋,艾凯,唐谦..阿尔泰山山前活动断裂带内现今地应力状态及稳定性分析[J].长江科学院院报,2018,35(3):79-84,6.基金项目
国家重点研发计划项目(2016YFC0401803) （2016YFC0401803）
中央级公益性科研院所基本科研业务费项目(CKSF2016041/YT,CKSF2017037/YT) （CKSF2016041/YT,CKSF2017037/YT）
