南水北调西线叶青—勒那曲引水线工程地质条件分段评价

SECTIONAL EVALUATION ON THE ENGINEERING GEOLOGICAL CONDITIONS OF YEQLNG-LENAQU DIVERSION LINE IN THE WEST LINE OF TRANSFERRING WATER FROM THE SOUTH TO THE NORTH

叶青—勒那曲引水线路根据地质构造、地貌特征、物理地质现象,共划分六个区段。德曲段:山脊寒冻风化碎石坡型,山坡融冻泥流及顺河断层发育;解吾曲下段:冻土沼泽发育,南北构造活动较强烈,区域稳定性及边坡稳定性较差;解吾曲上游段;山区和丘陵区断裂发育,在喜山末期有强烈的活动,滑坡、冰丘等不良地质现象极为发育;玛尕曲—洛曲南段:厚层地下冰发育,近期活动断裂明显;洛曲南岸—多曲东岸段:缓坡区有厚层地下冰,多年冻土布满全段;多曲东岸—万龙湾尕玛下游段:近代断裂活动明显,区域稳定性较差。

Six sections can be devided in the yeqing-lenaqu diversion line hased on geologictectonics, morphologic features and physical-geologic phenomena. In Dequ section ridgeswere belonged detrital slope formed by frost weathering and surfluctions and down-channelfaults devoloped on slopes; In the lower section of Xiewuqu frozen soils and swamps are de-voloped and the tectonic activity along N-S direction are strong,so the stability of region andslope are both low; In the upper section of Xiewuqu the faults that devoloped in mount andhill regions were activated strongly in the last stage of Himalayan period,some bad geologicalphenomena, such as landslide, ice hummock, etc., are very devoloped. In Magaqu-southbankof Luoqu section the thick-beded sub surface ices and recently active faults are devoloped.In south bank of Luoqu-east bank of Duoqu section the thick-beded sub surface ices aredevoloped in gentle slope areas andpermafrost distributed in whole region. In east bank ofDuoqu-lower reach of Wanlongwangama section modern faulting activity is obvious with lessregional stability.