Secondary Goes On Landslide Stability Analysis And Treatment Technology Research

The home town of Gansu Linxia to Jishishan County river two highway 309 line is part of the highway,one of the main channel is connected to my Prefecture in Linxia Province,Qinghai Province,is one of the most important channels for the province of Southwest Minority Autonomous County of Jishishan county to the state of Linxia and the provincial capital of Lanzhou city.The highway built in operation after a year and a half,slide in mileage K181+840~K182+040 left at the mountain landslide: high 70-100 m,length of 200 m,an area of about 11740m2,the volume of about 130 thousand,surface boreholes show that the depth of 3~21m,leading to a landslide Landslide at the bottom of wall cracking,road shoulder uplift.The C20 concrete masonry retaining wall,foundation depth more than 1.5m,the wall top width of 1m,high 5~6m,oblique section.According to the results of stability analysis and engineering geological conditions of the landslide investigation report shows that the deformation of the landslide is in a critical state,the role if it rains and other factors,are likely to slide failure.This paper,taking the landslide as the research object,by analyzing the engineering geological condition and landslide characteristics,on the basis of this puts forward the factors and formation mechanism of landslide triggered landslides;Secondly,through the analysis and calculation of the landslide deformation characteristics,to evaluate landslide stability,in the end,according to the result of stability evaluation,preliminary landslide governance plan and detailed design.Through the above analysis and calculation,the following main conclusions:(1)?the landslide deformation is mainly located at the landslide at the back,after a landslide wall appear fault,fracture development,and on both sides of the shear tension fracture,seam 20 ~ 40 cm wide,40 ~ 50 cm deep,a long strip in the sliding body part,sliding surface is relatively slow,belong to the project after the secondary goes on type of landslide.(2)?through to the landslide area layout three sections,each section layout three drilling,geotechnical test and shear test,accordingly the landslide area are studied in detail the engineering geological conditions,obtain the location of the sliding surface and its strength parameters.(3)?calculated three section under three conditions of slide thrust,determine K181 + 940 is the most dangerous sliding surface.To study the sliding surface by seismic horizontal force and adverse factors such as heavy rain conditions,landslide,pore water and pore water pressure,produced in the landslide thrust of 1259.501 kN/m.(4)?the calculation analysis,contrast the merits of the two kinds of back pressure and ZhuangBanQiang measures,and ultimately determine the ZhuangBanQiang for landslide control measures,anti-slide pile design is calculated on the basis of the maximum shear Vmax = 10884.852 kN,maximum limit bending moment Mmax = 36645.781 kN.m.(5)?surface drainage design return period for 10 years in a heavy rain,the rainfall the standard used for 10 minutes,according to the hydrologic and hydraulic calculation to determine the intercepting drain size: 0.5 m *0.5 m trapezoid,and USES the C25 concrete masonry.Intercepting ditch arranged at the rear near trailing edge slope and anti-slide pile wall at the top of the side close to the mountains,a total of two rows.In construction of intercepting ditch slope of not less than 3.5% of the rate to the rapids trough down slope,slope along the intercepting ditch water inflow slope on both sides of the rapids in the groove,jet trough using C25 concrete masonry.Rapids slot and having gully and landslide slope foot,finally will flow into the gully.(6)?construction organization design research,recommend construction pile bit order: 1 # to 4 # to 7 #,10 #,# 13-# 2-# 5-# 8 to 11 #,3 # and 6 # and 9 # and 12 # #-# 34-31-28 # and # 25-# 22 to 33 #,30 #,32 # #-# 24-27 to 29 #,# # 26-# 23-14 to 17 #,20 #,# # # 15-18-21-# 16-19 #;Each pile process: put the pile location measurement to clear and solid pile hole near the slope,anti-slide pile construction the lock-excavation section pile hole-banding steel-a die-casting and protecting breast wall concrete to excavation in the next section pile hole,repeat the above three steps until the design elevation-bound and pile reinforced-water-maintenance-excavation soil retaining pile body concrete plate bottom elevation above the earth to chisel in addition to the above soil retaining plate at the bottom of the retaining wall,cast-in-situ soil retaining plate at the bottom of the foundation soil retaining plate and installation.