Research On The Stability And Comprehensive Treatment Of The Lubanya Landslide

The 212 national highway (G212) is a main stem connecting Lanzhou to Chongqing, Terrain of longnan area of G212 is very complicated and the mountains are deep. Since being opened to traffic, this part has been suffering from intense landslide with average 25 days per year being blocked, which has affected traffic seriously. Luabnya landslide has even been slided three times since 1982, burying the G212, halting the transportation, causing the personnel casualty and seriously influencing the smooth of the road. With the development of the west China, the entire G212 will be transformed into freeway by the Ministry of Communications. It is necessary to carry out more research on lubanya landside in order to solve the construction problem of high-ranked G212 along landslide area.The thesis entirely analyses stratum and lithology, geological structure, physiognomy and topography and climate of the landslide region from background of Lubaya landslide. The on-site investigation of the landslide region is carried on, and showed that there were three sections in this region-- under the landslide, on the landslide, upside the landslip the landslide from bottom to top in turn. The characters of each section are written in detail. Three methods (method of natural history analysis, limiting equilibrium method and method of Numerical analysis) are used to respectively analyse the landslide stability. Method of natural history analysis indicated that upsides part tends to be stable, and down part is in the development;limiting equilibrium method worked out that the stability coefficients of upsides and down part respectively are 1.03 and 0.86. The distribution of stresses, contingency, scattergram of plastic zone and stability coefficient of smooth zone are obtained by finite, the down landslide proofed by FLAC is still sliding now and stressed with pull behind.It also testified feasibility of landslide treatment from research, condition and technical route, and researched landslide comprehensive program of public order measure from prevention and treatment aspect. Six kind of comprehensive schemes of public order are proposed and analyzed features and adaptation of each one respectively;finally there are four of them adapted to the landslide. In the end, it clarified the project combined anti-slide pile with drainage and interception system is the best method of treatment in the landslide by comparing the investment of the treatment schemes.