Numerical analysis and reinforcement management of a highway landslide in Fujian Zhangzhou

Abstract:

In order to manage a landslide， a numerical analysis model of the slope was constructed based on the on-site investigation data， taking the inflection point of the displacement of the characteristic point of the slope as the criterion， and adopting the strength discount method to determine the stability coefficient of the natural working condition of the slope to be 1.05， it was determined that the stability level of the slope did not meet the requirements of the engineering specification， and it was in the state of understability. Combined with the numerical analysis results， experts’ on-site analysis opinions and the mechanism of slope reinforcement measures， three kinds of reinforcement and management programs are determined， Program 1 is “Circular anti-slip piles + anchors + intercepting and draining”， Program 2 is “Square anti-slip piles + Circular anti-slip piles + Anchors + intercepting and draining”， and Program 3 is “Square anti-slip piles + Circular anti-slip piles + Intercepting and draining”. Based on the finite element numerical model to analyze the stress field， displacement field and slope stability coefficient changes of the rock and soil body， anti-slip piles and anchors， the stability coefficients of natural working conditions of the slope corresponding to the three reinforcement schemes were calculated to be 1.39， 1.28， and 1.18， which were 32.4% higher than those before reinforcement， and the stability coefficients of the natural working conditions were calculated to be 1.39， 1.28， and 1.18， which were 32.4% higher than those before reinforcement. Before the reinforcement， the stability coefficients of the natural working condition of the slope were 1.39， 1.28 and 1.18， respectively， which were 32.4%， 21.9% and 12.4% higher than those before the reinforcement； after comprehensively comparing the reinforcement measures of the three kinds of reinforcement schemes and the changes in the stress and displacement of the slope， as well as their reinforcement effects and economic levels， Scheme 1 was comprehensively determined as the final reinforcement scheme.

Key words:slope stability;anti-slip piles;anchors;intercepting and draining;landslide reinforcement