工程地质学报
工程地質學報
공정지질학보
2014年
2期
280-291
,共12页
张杰%王宇%张红兵%朱春林%李俊东%晏祥省
張傑%王宇%張紅兵%硃春林%李俊東%晏祥省
장걸%왕우%장홍병%주춘림%리준동%안상성
彝良地震%次生地质灾害%特征分析%降雨叠加效应
彝良地震%次生地質災害%特徵分析%降雨疊加效應
이량지진%차생지질재해%특정분석%강우첩가효응
Yiliang earthquake%The secondary geological hazards%Characteristic analyse%Rainfall superposition
2012年9月7日11时19分40秒,云南省彝良县发生M5.7级地震,12时16分29秒,再次发生M5.6级地震,两次地震诱发了大量的崩塌、滑坡、泥石流等次生地质灾害。通过现场调查,分析了本次地震次生地质灾害的主要特征:震后次生地质灾害数量明显增加、由地震直接诱发的地质灾害分布明显受震中控制;Ⅷ度区、Ⅶ度区的地震地质灾害点密度分别是Ⅵ度区地震地质灾害点密度的11倍与4.5倍;地质灾害的分布表现出很明显的“上/下盘效应”,上盘地质灾害密度是下盘地质灾害密度的2.6~3.9倍;震后新增次生地质灾害点的分布受岩土体性质控制明显;震后次生地质灾害“降雨叠加效应”与“链生效应”较为明显,具有“震级小、灾情大、灾害多、规模小”的特点。
2012年9月7日11時19分40秒,雲南省彝良縣髮生M5.7級地震,12時16分29秒,再次髮生M5.6級地震,兩次地震誘髮瞭大量的崩塌、滑坡、泥石流等次生地質災害。通過現場調查,分析瞭本次地震次生地質災害的主要特徵:震後次生地質災害數量明顯增加、由地震直接誘髮的地質災害分佈明顯受震中控製;Ⅷ度區、Ⅶ度區的地震地質災害點密度分彆是Ⅵ度區地震地質災害點密度的11倍與4.5倍;地質災害的分佈錶現齣很明顯的“上/下盤效應”,上盤地質災害密度是下盤地質災害密度的2.6~3.9倍;震後新增次生地質災害點的分佈受巖土體性質控製明顯;震後次生地質災害“降雨疊加效應”與“鏈生效應”較為明顯,具有“震級小、災情大、災害多、規模小”的特點。
2012년9월7일11시19분40초,운남성이량현발생M5.7급지진,12시16분29초,재차발생M5.6급지진,량차지진유발료대량적붕탑、활파、니석류등차생지질재해。통과현장조사,분석료본차지진차생지질재해적주요특정:진후차생지질재해수량명현증가、유지진직접유발적지질재해분포명현수진중공제;Ⅷ도구、Ⅶ도구적지진지질재해점밀도분별시Ⅵ도구지진지질재해점밀도적11배여4.5배;지질재해적분포표현출흔명현적“상/하반효응”,상반지질재해밀도시하반지질재해밀도적2.6~3.9배;진후신증차생지질재해점적분포수암토체성질공제명현;진후차생지질재해“강우첩가효응”여“련생효응”교위명현,구유“진급소、재정대、재해다、규모소”적특점。
The MS5.7 earthquake occurred at 1 1:19 on September 7,2012 in Yiliang county,Yunnan province, China.Later,a MS5.6 earthquake occurred again at 12:16.Many geological hazards were induced by the two earthquakes.They include collapses, landslides, mudslides and other secondary geological hazards.Field investigations show the following major characteristics of the secondary geological hazards of the Yiliang earthquakes.The number of secondary geological hazards was increased significantly after the earthquakes.The distribution of geological hazards that induced directly by the earthquake is controlled obviously by distance to the epicenter.The geological hazards densities at theⅧandⅦintensity areas respectively are 1 1 and 4.5 times of that at the Ⅵ intensity area.The distribution of geological hazards clearly shows the effect of hanging and foot walls of the geological fault.The seismic geological hazards density of the fault hanging wall is 2.6~3.9 times as that of the foot wall.The distribution of new secondary geological hazards is obviously controlled by the properties of rock types after earthquake.The effect is obviously that the “superposition of rainfall”and the “geological hazards chain”of secondary geological hazards after earthquakes.The main characteristics are “small magnitude with large disaster and more hazards with small scale”in Yiliang earthquakes.