Study On The Stability Ofreservoir Bank Of Yalong River For Gongke Hydropower Station

Proposed yalong river hydropower station were families in sichuan province ganzizhouXinLong county in yalong river upstream of the river landscape in cascade on the transitionalzone of mountain valley region on the eastern margin of the qinghai-tibet plateau, tectonicarea in The sichuan-yunnan rhombic block internal secondary fault blocks of the yajiang-litang-jiulong rhombic block, the distance of the garze litang fracture-recently only5km,complex geological structure background survey found within the reservoir area landslide andlarge oversize deformation development, status quo of the bank slope stability ispoorer.reservoir after some sent mudslides diluvial deposit and landslides and soil bank,bank rebuilding will occur, such as threatening the safety of dam and reservoir area residentsalong the river highway, reservoir bank slope stability problems, therefore, research on thereservoir bank slope stability have important engineering practical value.This article follows the geological process mechanism analysis and quantitativeevaluation of the guiding ideology. During the deformation and failure mode of the reservoirbank slope structure type, based on the knowledge of law and by using the combined methodof qualitative and quantitative scope of bank slope in reservoir area landslide stability soilbank detailed evaluation. Finally, of the bank slope stability by fuzzy synthesis evaluationmade main conclusions as follows:(1) Reservoir bank slope are two main types of rock bank slope and the soil bankslope.soil bank according to the rock and soil formation can be divided into deposit depositbank slope deformation and landslide slope from colluvial deposit product rushed diluvialdeposit bank slope debris flow deposit bank and bank slope; Rock bank slope in the bankslope structure is classified into dipping downstream bank slope dipping reverse slope steepbank slope steep dip slope in external oblique to the bank slope steeply inclined lateral bankslope(2) Within the reservoir rock bank slope main deformation failure mode is bending,cracking, soil bank main failure mode of circular arc form slump and bank slope collapsetype development of large scale of landslide (deformation) have hemp, landslide damdeformation in several rabbah collapse, landslide body and the landslide, landslides and landslides in addition to the jianghuai jianghuai temple temple of accumulation landslide, thelandslide failure mode is bending, cracking damage(3) Landslide and slope structure valley landforms and closely related to the neotectonicmovement, the large-scale landslide mainly happens on the longitudinal valley of concavebank river valley and three facing empty ridge mountain is beneficial to the deformation ofrock mass unloading and parts, with advanced pedestal terrace of stress adjustment step slopefavorable general stability according to the slope structure and geological hazardsdevelopment characteristics will Phillip district bank altogether is divided into four segments,the segments along the development, poirot anticline axis is given priority to with thelongitudinal valley of stability is poorer, paragraph mainly horizontal valley bank slopestability is better(4) Through qualitative quantitative analysis shows that the flax, landslide as a wholeand partial in3#natural rain and3036m under static water level is in stable condition, underearthquake conditions remains unstable and unstable state;2#local basic stability in natural,heavy rain in seismic condition is unstable, in3036under the static water level in theunstable state，1#potential unstable body in natural conditions in the basic stability, staticwater level and heavy rain conditions in3036is basically stable to unstable, under earthquakeconditions remains unstable and unstable; Diba deformation under natural conditions in astable state, the earthquake condition remains unstable and unstable state, in heavy rain and3036m under the water level in the stable state; Jianghuai temple landslide under natural andstatic water level of3036m is in stable condition, under the seismic condition in the unstablestate of reservoir level fluctuation through finite element study on the stability of landslide,landslide stability in the process of reservoir water drop less water(5) Analysis indicates that the reservoir bank collapse occurred for the section a total of21, width of bank collapse prediction in more than50m bank slope section9, the total lengthof3782m, accounting for5.4%of the reservoir area overall length, width of bank collapseindividual profiles of more than200m (for landslide collapse); Width of bank collapseprediction within20to50m to nine coastal section, total length of4366m, accounting for6.2%of the general; Width of bank collapse prediction in0~20m for coastal9section, totallength of1260m, accounting for1.6%of the general(6) Yalong river, Phillip area full length70.8km, is divided into55bank slope section,26paragraph on the left bank, on the right bank29bank slope section.stable level of bankslope section to32section, accounting for77.93%of the main library on both sides of bankchief;basically stable slope section to14, accounted for15.14%of the main library section onboth sides of the chief, and potential unstable slopes period as two, accounting for the mainlibrary bank chief was1.97%, the percentage of unstable7percentage is4.96%of main bank chief stable period and stable period of the yalong river bank, over92.4%of the total lengthand absolute advantage.