Stability Evaluation of the Cutting Slope of the Operating Expressway
At present,"micro piles+anchor cables"reinforcement scheme is widely used in China,especially in Guangdong Province,to stablize sliding slopes.However,after reinforcing the original sliding zone,new potential sliding zones may develop due to soil creep.Traditional exhaustive iteration methods are limited by boundary conditions,making it difficult to accurately search for new sliding zones.In order to investigate the post construction stability of this type of slope,based on the advantage of using strength reduction method to search for the most dangerous sliding zone,the shear strength parameters of rock and soil were reduced using FLAC3D software strength reduction method,and the changes in the sliding zone of the slope before and after reinforcement and the safety factor of the current working conditions were inferred.This article takes a highway project where"micro piles+anchor cables"scheme was used to stablize a high slope of a fourth level cutting as a study case.The results calculated using the above method show that the safety coefficient of the slope before the application of engineering measures is only 1.06,with the landslide range covering from the first to fourth level slopes.While,after the application of engineering measures,the safety coefficient of the slope can be increased to 1.68,and the potential deformation range can be significantly reduced,narrowing to only the soil in front of the piles.The monitoring results after slope treatment show that the cumulative increment of surface horizontal displacement at all measuring points is only about 10mm,and the cumulative values of deep horizontal displacement of the second and third level slope platforms are less than 5mm.This study indicates that the use of the"micro pile+anchor cable"reinforcement scheme can effectively control the sliding behavior of the slope and play a positive role in limiting the accelerated deformation development of the slope.
high slope of highwaysmicro pile treatmentstrength reduction methodstability evaluationdeformation monitoring
NETL
NSTL
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