A composite improvement method suitable for backfilling of strongly weathered rock and gravel roadbeds

CN122304239APending Publication Date: 2026-06-30SOUTHEAST UNIV +2

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: SOUTHEAST UNIV
Filing Date: 2026-04-02
Publication Date: 2026-06-30

AI Technical Summary

Technical Problem

Existing technologies are insufficient in the interlocking of coarse and fine particles and the bonding of interfaces in strongly weathered rock and gravelly soil, resulting in unstable overall solidification effect and poor durability under wet-dry cycles, making it difficult to meet the requirements for long-term service.

Method used

By controlling the order of lime and cement addition and the staged molding process, the strongly weathered rock and gravel soil is pretreated with lime first, and then cement is added later. Combined with the staged compaction process, a continuous coarse and fine particle interface cementation structure is formed, which inhibits the generation and expansion of microcracks.

Benefits of technology

It significantly improves the structural stability and durability of strongly weathered rock gravel soil, enhances its residual strength and water stability under repeated wet-dry cycles, and meets the requirements for long-term engineering service.

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Abstract

This invention discloses a composite improvement method suitable for backfilling of strongly weathered rock gravel soil subgrade, comprising: adjusting the strongly weathered rock gravel soil to the optimum moisture content and allowing it to stand; adding lime to the obtained gravel soil and mixing, then allowing it to stand; adding cement to the lime-pretreated gravel soil and mixing it evenly; performing a first-stage compaction, static setting, and a second-stage compaction on the gravel soil in sequence; and curing; wherein the amount of cement and lime is 5%~8% of the dry gravel soil, and the mass ratio of cement to lime is (1.5~3):1. This invention, through the process path of "lime pretreatment—delayed cement addition," completes the activation and structural adjustment of the fine particles of strongly weathered rock gravel soil before the cement participates in the reaction, avoiding the interference of early cement hydration on the measurement of compaction parameters and the compaction process, which is conducive to forming a uniform and stable cemented structure, improving the mechanical properties of strongly weathered rock gravel soil, and enhancing its water stability and durability.

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