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Abstract

As a backfill with abundant reserves and poor gradation in desert areas, aeolian sand has been successfully applied to some highway subgrades in China, but the treatment of aeolian sand is mainly focused on the superficial surface, and there are few studies on its deep or underwater treatment methods and applicability. Combined with the aeolian sand subgrade in Taitema Lake section of Urumqi–Yuli Expressway project in Xinjiang, the dynamic compaction method was used to treat the aeolian sand in deep water. The aeolian sand sediment, uplift, and excess pore water pressure during compaction were monitored, and the effects of dynamic compaction before and after reinforcement were compared. The results show that the optimum single point compaction energy is 2 500 kN·m in the aeolian sand subgrade of desert lakes with a depth of 5 m, and the optimum single point compaction number is 8–9. The distance between compaction points is 4.5 m, and the surface uplift is small during compaction. The excess pore water pressure dissipates quickly, and continuous operation can be performed when multiple points are compacted. The reinforcement effect before and after dynamic compaction of aeolian sand is obvious, and it can be used as a backfill of highway subgrades.

Publication Date

11-24-2023

DOI

10.14048/j.issn.1671-2579.2023.05.003

First Page

14

Last Page

21

Submission Date

March 2025

Reference

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