Study On The Developing Characteristics And Genesis Geological Environmental Conditions Of Landslides In The Bailongjiang River Basin

Landslide is always one of the most prominent geological disasters influencingand restricting human engineering activities.Normally, landslide activity issynthetically affected by many kinds of geological conditions.To study developmentcharacteristic and activities regularly controlled by Genesis geological environmentalconditions of the landslides of Bailongjiang River basin is the necessary condition ofboth geological hazard evaluation and mitigation in hydropower developmentprocess,which is also the demand of the theoretical study of regional landslide hazard.Based on deeply studying basic geological conditions of Bailongjiang riverbasin,this paper,analyses formation and evolution process of the valley,and divides indetail structure types of both sides of valley.Meanwhile,sduties the failurecharacteristics of bank slopes, Mainly developmental characteristics of river-basinlandslide，and on this basis,researches the law which every geological conditioncongtrols river-basin landslides,and in the last further quantificationally analyse thehierarchical relationship which every geological condition congtrols river-basinlandslide. Main achievements and cognition obtained by this paper are as follows:(1)Based on the study of regional geological conditions of Bailongjiangriver-basin， this paper is main subject to the valley physiognomy such as regionalplanation surface and river valleys terrace, analyse the formation and evolution ofBailongjang valley,then learn that after modern wide face formed1.8Ma ago theBailongjang valley has experienced eight times of uplifting and valleys slicing events.(2)Studies the shore-slope structure types and deformation，mainly developmental characteristics of landslide,and divides the shore-slope structure types of lower reachfrom Wangzang village,Diebu town of Bailongjiang River. Find that shallowlymetamorphic rock series is the most rock series in river basin,most of which is phylliterock facies, slate rock facies metamorphisms rock, but the distribution of soil bank isless. Among shallowly metamorphic rocks of rocky bank, the distribution of middleand steep inclination in coincidental and oblique slope is the broadest.(3)Analyses deformation and failure characteristic of Bailongjiang river-basinshore, especially the development characteristic of landslide and origin mechanismtypes and so on. Take on that landslides among the mid-dip slant shore-slope (IV2b) ofriver-basin are the most developed,and genetic mechanism has polytype,thereof originmechanism types of the landslides in the mid-dip syntropy slope which is most widelydistributed most the slipslip-rip and slipslip-bend.(4)On the basis of the statistical data of basin landslides developing characteristics,combined with basin geological environmental conditions,using GIS(geographicalinformation system)analysis software to found a mathematical model ofBailongjiang River basin landslides and relevant genesis geologicalconditions,analysed the law which geological environmental conditions，includingtopography and geomorphology, stratigraphic lithology, shore-slope structure,geological structure, neotectonics and earthquakes and so on，control or influencedevelopmental distribution and genetic mechanism of river-basin landslides.(5)Based on the control law between development distribution characteristicsand environmental conditions,establish the evaluation index system of genesisgeological environmental conditions of Bailongjang river-basin landslides,and basedon AHP method further quantificationally and hierarchically analyse genesis geologicalenvironmental conditions of Bailongjiang river-basin landslides, get the concllusionwhich the function that evaluation factors of regional fault zones and consequentslope layered rock mass slope control river-basin landslides is the most significant.