A method for acquiring the pile-soil stress ratio of a pile-supported roadbed under a particle crushing condition

Abstract

The invention provides a method for acquiring the pile-soil stress ratio of a pile-supported roadbed under a particle crushing condition. The method comprises the following steps: determining a particle damage index Br; Determining a soil body particle size coefficient nd according to the particle damage index Br; Determining the arch height hc and the arch angle alpha h of the soil arch accordingto the soil particle size coefficient n; And determining the pile-soil stress ratio of the pile-supported roadbed according to the arch height hc and the arch angle alpha h of the soil arch. The method for obtaining the pile-supported roadbed pile-soil stress ratio under the particle crushing condition can determine the load sharing condition of the pile-supported roadbed pile-soil-network, can be used for accurately calculating post-construction settlement of the pile-supported subgrade, can reduce subgrade diseases caused by soil arch damage, and save the line operation and maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of railway tracks, and in particular relates to a method for obtaining the pile-soil stress ratio of a pile-supported roadbed under the particle crushing condition. Background technique [0002] Under the action of high subgrade load, train dynamic load, and dry-wet cycle caused by the climate environment, the subgrade filler and foundation soil particles at the junction of the subgrade and the foundation are prone to disintegration and fragmentation, and the strength is reduced. The shape and properties of the arch force chain change, causing damage to the soil arch in the pile-supported subgrade, which makes it difficult to control the post-construction settlement of the subgrade after the line is in operation, the smoothness of the track is reduced, and it is very difficult to repair the soil arch during the operation period. Therefore, the accurate calculation of the pile-soil stress of the subgrade play...

AI Technical Summary

Problems solved by technology

However, the existing soil arch shape is mainly based on the assumption of homogeneous soil, and does not involve the arch variation caused by the change of particle characteristics.

In the actual working process of pile-supported subgrade, particle breakage often leads to particle size refinement and uneven distribution of particle groups, causing large contact force chain density change angle and arch height at the arch foot of the soil arch, and the upper part of the soil shared by the piles The increase of subgrade load leads to a passive decline in the load-bearing efficiency of piles and geogrids, and a significant increase in the failure risk of pile-supported subgrade reinforcement

[0005] The existing methods for determining the pile-soil stress ratio of pile-supported subgrades do not fully consider the condition of particle breakage, and the accuracy of post-construction settlement calculation for pile-supported subgrades is low. cost

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