摘要
那勤滑坡发育在花岗岩区,属中型山体滑坡。其主要地物标志是:发育于滑坡体后缘的拉张裂缝;出现在滑坡体中后部与滑坡体延伸方向一致的槽型洼地;生长在拉张裂缝边缘的醉林和马刀树;由花岗岩转石的滚石堆及空洞组成的堆积体。其主要工程物探标志是:在超过2000Ω·m的视电阻率背景下,低(nΩ·m×100Ω·m)视电阻率异常带与滑坡中部出现走向近EW的裂隙带一致;大于4000Ω·m的高视电阻率异常与花岗岩滚石和空洞组成的堆积体一致。据物探资料测算,滑坡体的基岩面埋深为7～27m。其成因模式是:裂隙带为形成花岗岩滚石创造了条件,自重力因素造就了花岗岩滚石和空洞组成的堆积体,人为或自然因素诱发滑坡。
The Naqing landside that is middle-sized hillside landslide has developed on the granite area. The major surface object indicators include pull-apart fractures developed at the rear margin of the landslide,trough type depression appearing coincident with the direction of landslide body extension at the center and rear end of the landslide,the drunkard-like forest and yataghan-like trees growing at the margin of pull-apart fractures and dump and hollow of granite floater. The main engineering geophysical prospecting indicators include the lower apparent resistivity anomalies under the background of over 2000Ω·m; high apparent resistiveity coincident with the nearby E-W striking fracture zone which occur at the center of the landslide; the higher apparent resistiveity over 2000Ω·m coincident with the accumulation body consist of granite dump and hollow; the burying depth of the bedrock surface of the landslide is 7m^27m thick according to geophysical data. The genetic model is inferred that the factor of self-gravity caused the accumulation of granite dump and hollow with the fracture zones as a precondition for the formation of granite dump,that is to say that the man-made and natural factors induced the landslide.
出处
《矿产与地质》
2004年第5期488-492,共5页
Mineral Resources and Geology
关键词
滑坡
地物标志
成因模式
那勤
广西
landslide, indicator of surface feature, genetic model, Naqing, Guangxi
