The soil in loess areas exhibits significant collapsibility,leading to poor foundation stability.Components such as the track bed and foundation may experience settlement,cracking,mud pumping,and other defects under the dynamic vibration of trains.These issues have hindered the development of heavy-haul railways to a certain extent and compromised train operation safety.Based on the Shilou Tunnel of the Central and Southern Shanxi Railway Corridor,a three-dimensional finite element model was established to analyze the reinforcement effectiveness of jet grouting piles.Initially,the reinforcement effect of jet grouting piles during tunnel construction was calculated.The results indicated that without jet grouting pile reinforcement,the maximum uplift of the inverted arch was 16.3 cm,which was reduced to 5.66 cm after reinforcement.Additionally,the variation amplitude of deformation at various measurement points on the inverted arch decreased,suggesting that jet grouting piles not only reduced surrounding rock deformation but also improved its stability.Furthermore,this paper conducted computational analysis on the effectiveness of jet grouting piles in improving the dynamic response of the inverted arch during operational periods.The results showed that when jet grouting piles were used,the maximum displacement amplitude at the center of the inverted arch decreased from 2.51 cm to 0.69 cm,representing a 72.5%reduction.In terms of acceleration response,the peak acceleration at the center of the inverted arch was the highest,with a value of 3.29 m/s-2,which was nearly 36%lower than the 5.11 m/s-2 observed without reinforcement.
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