The Construction Monitoring And The Numerical Simulation Analysis Of Super-long Anti-slide Pile In Deep Landslide

Based on Daping landslide treatment engineering of Fengxi highway, this paperdiscussed the designing of the deep landslide monitoring scheme and the analysis of themonitoring results. By using the numerical simulation software of Midas/GTS, the paperanalyzed the construction process of super-long anti-slide pile and the landslide’s stability andevaluated the stress distribution of super-long anti-slide pile and the reinforcement effect ofthe landslide, compared with the measured data.The research contents and methods:(1) By consulting the scheme design of landslide monitoring at home and abroad,combined with the actual geological situation of Daping landslide, the paper designed themonitoring scheme of Daping landslide overall.(2) The paper selected two monitoring projects for the deep landslide: one is the insidedisplacement monitoring of the landslide by using the inclinometer; the other is the surfacedisplacement monitoring of the landslide by using the total station.(3) The paper selected three monitoring projects for the stress states of the retaining wall:the steel axial force、the concrete stress and the earth pressure of different section.(4) By using Midas/GTS for the construction process of super-long anti-slide pile’sthree-dimensional simulation, the paper analyzed the stress and deformation change ofsuper-long anti-slide pile in the process of construction, and summarized the stress anddeformation regularity.(5) By establishing the two-dimensional finite element model, the paper analyzed thestability of the landslide and evaluated the reinforcement effect. There are two kinds ofworking condition: the natural state and the governed state.The main research results:(1) By the deep displacement monitoring and the surface displacement monitoring of thelandslide, the results can be summarized:①there are two sliding surface in15m depth and35to40m depth;②the landslide has been shown in a stable state.(2) Through the stress monitoring of the retaining wall, the steel and concrete stress ofC6、F4piles is largest in30m and second in20m, the internal force of the H3pile is largest in40m and second in20m. It reflects that the force of the landslide above and under the slidingsurface is different, and the anti-slide force relatively concentrates near the sliding zone.(3) Based on the results of the different dip holes and anti-slide piles, the paper mappedthe slip surface of Daping landslide respectively. (4) Through the construction process of the deep pile’s three-dimensional simulation, thepaper analyzed the stress and deformation change of the super-long anti-slide pile in differentdepth. As the model is simplified, the obtained data is different from the actual data slightly,the distribution law is roughly like the horizontal “V” word, and the values is prominently onthe sliding surface.(5) Through the two-dimensional numerical simulation of the whole landslide, the resultscan be summarized: the maximal displacement of landslide changed from0.248m to0.021m,the stable safety coefficient changed from0.9125to1.4625, the stress and deformation of theant-slide pile was in the allowable range, and the landslide was in a steady state.