郯庐断裂带江苏段地应力测量及断层稳定性分析  

In-situ Stress Measurement in the Jiangsu Section of the Tanlu Fault Zone and its Slip Stability Analysis

作　　者：张士安[1,2] 杜建军 刘卫东[3] 秦向辉 吴满路[1,2] 宗开红[4] ZHANG Shian;DU Jianjun;LIU Weidong;QIN Xianghui;WU Manlu;ZONG Kaihong(Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;Key Laboratory of Neotectonic Movement & Geohazard, Beijing 100081, China;No. 3 Mining District of Jinchuan group co. LTD, Jinchang 737103, China;Geological Survey of Jiangsu Province, Nanjing 210018, China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]新构造运动与地质灾害重点实验室,北京100081 [3]金川集团股份有限公司三矿区,甘肃金昌737103 [4]江苏省地质调查研究院,江苏南京210018

出　　处：《防灾科技学院学报》2020年第3期18-27,共10页Journal of Institute of Disaster Prevention

基　　金：中国地质调查局项目(DD20160270)。

摘　　要：郯庐断裂带是我国东部一条非常活跃的深大断裂带,其中F5断裂(安丘-莒县断裂)是郯庐断裂带内晚第四纪以来构造活动最强的断裂,也是1668年郯城M8.5地震的发震断层。为了查明研究区现今浅层地壳应力状态和分析地震的危险性,应用水压致裂法在江苏省开展了两孔地应力测量工作。测试结果显示地应力结构为SH>Sh>Sv,表明现今地应力状态有利于断层发生逆冲活动。但是,地应力量值属于中低水平,并且对结果进行特征参数Kav、KHV、KHh和μm值的分析,认为研究区的地应力积累水平较弱;同时,采用库仑摩擦滑动准则,结合拜尔定律,分析了断层的稳定性,认为郯庐断裂带江苏段尚未达到断层失稳的临界地应力状态。本文为区域内的地震地质研究和分析断裂导致的各种地质灾害提供了数据,对于江苏省的防震减灾工作有重要的参考意义。The Tanlu fault belt is an active deep fractured zone in eastern China.Among the belt F5 fault(Anqiu-Juxian fault)is one with the intensity tectonic activity since the late Quaternary,and it is also the seismogenic fault of the Tancheng M 8.5 earthquake in 1668.To find out the upper crustal stress state and analyze the possibility of earthquakes in the study area,we have carried out two borehole in-situ stress measurement in Jiangsu Province by using hydraulic fracturing method.The test results reveal that the current in-situ stress structure is SH>Sh>Sv,indicating that the current in-situ stress state is conducive to the thrusting of the fault.However,the ground stress value is of a middle and low level,and the results analysis of the characteristic parameters Kav,KHV,KHh andμm show a low level of in-situ stress accumulation in the study area.Furthermore,we analyzed the possibility of fault slip by using Column friction criterion and Byerlee's law,it’s believed that the current in-situ stress state in Jiangsu section of Tanlu fault zone has not yet reached the expected limit of fault slip.This paper provides data for the study of the regional seismic geological and analysis of various geological disasters caused by fractures in this area,thus claiming important reference significance for earthquake prevention and disaster mitigation in Jiangsu Province.

关 键 词：郯庐断裂带 江苏段 地应力测量 断层稳定性 

分 类 号：P315.2[天文地球—地震学]