三峡近坝库段水库诱发地震特征分析.pdf

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1、JournalofEngineeringGeology工程地质学报1004—9665／2013／21(6)-0932-06三峡近坝库段水库诱发地震特征分析木吴世泽①罗飞①房艳国①严福章②朱建①贾海萍①(①长江三峡勘测研究院有限公司武汉430074)(②中国国电公司北京100011)摘要大型水利水电工程水库诱发地震历来受业主、工程技术人员的重视。三峡工程蓄水10多年来，在蓄水过程中，三峡库区较蓄水前地震明显增多。本文选择了三峡库区既有活动断裂，又有可溶岩和煤层分布的近坝库段作为研究对象，通过对库区地震活动与水位的关系和诱发地震空间展布特征分析

2、，认为：三峡水库诱发地震，发生在有可溶岩和含煤地层部位的塌陷型地震占总数的90％，而非可溶岩和不含煤地层中只占总数的10％；近坝库段地震主要发生在仙女山断层北端，且有地震呈丛集活动的特征；九湾溪断层上盘远离长江部位地震零星分布，距长江较近地段地震相对增多，下盘地震极少。地震与水位的对应关系十分密切，三峡水位上升，长江两岸发生的小地震较多，当水位蓄至175m时，地震主要发生在仙女山断裂的北端和九湾溪断裂的上盘及北端。关键词三峡水库近坝库段诱发地震特征分析中图分类号：TU411文献标识码：ACHARACTERISTICANALYSIS0FRES

3、ERVoIRINDUCEDEARTH—QUAKESNEARBYTHETHREEGoRGESDAMWUShize①LUOFei①FANGYanguo①YANFuzhang②ZHUJian①JIAHaiping①(①ThreeGorgesGeotechnicalConsultantsCo．，Ltd．，Wuhan430074)((~ChinaGuodianCorporation，Beijing100011)AbstractReservoirinducedearthquakesoflarge-scalehydropowerprojecthaveal

4、waysaconcernofownersandtechnicalpersonne1．TheThreeGorgesreservoirhasbeenimpoundedfor10years，andtheearthquake~equencyinthereservoirincreasessignificantlyduringtheimpoundment．Anareanearthedamsiteandwithactivefaults，car—bonafiteandcoalseamsischosenastheresearchobject．Analyzet

5、hespatialdistributionofreservoirinducedearth—quakesandtherelationshipbetweenearthquakeandreservoirwaterleve1．Theanalysisresultsindicatethat90％ofthereservoirinducedearthquakesarecollapsinginducedbyearthquakeswhichoccurredincarbonatiteandcoalseams．TheotherlO％occurredinothers

6、tratums．Italsoindicatesthatthea~itudeofstratumhasasignificanteffectonreservoirinducedearthquakes．Theearthquakesnearthedamsitehaveclusteringdistributioncharacteristic，whichmainlyoccu~edatthenorthernpartofXiannvshanFault．SomeearthquakesoccuredinthehangingwallofJiuwanxifault，

7、whichoccurredmoreatthenearbysiteofYangtzeriverandlessinthefarawaysite，whilerarelyOC-curedintheheadingwallofthefault．Thereservoirinducedearthquakesandreservoirwaterlevelarecloselyrelat—ed．WhilethewaterlevelofThreeGorgesreservoirrises，manysmallearthquakesoccuronbothsidesofYa

8、ngtze十收稿13期：2013-08-08；收到修改稿13期：2013—11—15．第一作者简介：吴世泽，主要从事区域地质、地震地质、工程地质勘察工作．Email：532356