DOI: 10.11648/j.sr.20261404.12 ISSN: 2329-0927

Experimental Study on the Technology of Fiber-Admixture Composite Stabilization for Ultra-Soft Soil

Shaokun Yang, Mingfei Xu, Yongcun Deng
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To address the technical challenge associated with the inability to utilize dredged sediments from existing rivers and lakes, this study focused on dredged ultra-soft soil from coastal areas. Taking into account various factors such as soil moisture content, dosage of curing agent and foaming agents, as well as fiber type, dosage, and size, research was conducted on lightweight solidification technologies suitable for fiber-reinforced high water content ultra-soft soil. The test results indicate: 1) The fiber reinforcement effect significantly improved the brittle failure mode of the solidified lightweight soil, substantially enhancing the structural stability and ductility, with basalt fiber providing the best reinforcement effect. 2) The increase in unconfined compressive strength of solidified lightweight soil ranged from 10.2% to 23.4% under different fiber dosages and lengths. When the fiber length exceeded 20 mm, the increase in strength gradually stabilized. With the increase of fiber dosage, the strength showed a trend of increasing first and then decreasing. 3) The 7d density-strength ratio of fiber-reinforced dredged solidified lightweight soil reached 100.49 kPa/(g·cm -3 ), representing increases of approximately 56.1%, 33.6%, 38.5%, and 28.0% compared to ordinary subgrade soil, conventional solidified soil, fiber-modified cement soil, and EPS-particle lightweight soil, respectively. The research findings can provide theoretical foundation for ultra-soft soil treatment in activities such as coastal tidal flat development, river dredging, and road subgrade renovation and expansion.

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