Anti-slide Pile Optimization Design By The Change Of Pile Spacing

Compared with the traditional measures, such as drainage、reducing load、 retaining wall and more, anti-slide pile is simple, has strong skid resistance ability, and more advantages, so it’s used at home and abroad rapidly. While the traditional design method is conservative, tend to be safer, numerical simulation technology can be in line with the engineering needs more closely, so the comprehensive analysis has become a trend of anti-slide pile design in recent years.Anti-slide is protected by uplift piles in one railway line DK815+715.015-+809.775, Using field monitoring experiment means, theoretical calculation and finite element software ANSYS toanalyze the-rationality of original design. Analyzing the change of the slope displacement、internal force and slope safety by changing the pile spacing. Trying to make anti-slide pile cost minimum, the most reasonable in economy, and improve the economic benefit by comprehensive analysis.The main research content is as follows:(1) Anti-slide pile designCalculating structural internal force by applying the method of cantilever pile According to actual engineering geological condition.(2) Field monitoring experimentTo make sure the safety of the anti-slide, they must be sure that whether Slope is stable, the anti-slide pile supporting effect is good by Monitoring slope displacement and pile’s displacement and stress changes. Monitoring shows that slope safety is good, the anti-slide pile itself is not damaged. Monitoring data is smaller than value designed, it shows that excogitation is conservative.(3) Numerical simulation analysisFor the engineering slope and anti-slide pile, analyzing the change of the soil arch effect between pile, pile body stress and slope safety factor, displacement effect and size distribution of displacement of anti-slide pile under the different pile spacing by establishing3d entity model. Research shows that:the soil arch emerges when pile spacing is5.5meters, the soil arch is disappears when pile spacing is6.5meters; pile body’s stress is more than limit equilibrium state when L is6.5meters; the anti-slide pile supporting effect is hard to play, safety factor of slope basically remain unchanged when L is6.5meters.(4) Anti-slide pile optimizationGiving the optimal pile spacing value that is5.5meters according to above analysis:soil arching effect, anti-slide structure safety and economic cost.