Phosphogypsum Embankment Mixture Construction Method
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Solution Overview
Problem
Conventional embankments face challenges in compaction and leveling due to varying physical and mechanical properties of soil-rock mixtures in complex geological conditions, leading to differential settlement and road surface deformation, while phosphogypsum accumulation poses environmental and land-use issues.
Innovation Solution
A method involving the preparation of a phosphogypsum-containing embankment mixture with cement and sodium silicate, optimized for maximum dry density and moisture content, is used in layers with anti-seepage cushion layers to create a stable embankment structure, utilizing isostatic pressing and compaction techniques for efficient filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple types of soil-rock mixtures with different physical and mechanical properties are used for embankment filling, then the embankment can be constructed, but differential settlement and road surface deformation occur due to difficulty in compaction and leveling
Solution Approach 1:
The patent applies homogeneity by using phosphogypsum as a uniform filling material with consistent physical and mechanical properties throughout the embankment structure. This eliminates the differential settlement issues caused by mixing different soil-rock types, as the homogeneous material compacts uniformly and provides stable, predictable engineering properties across the entire embankment volume.
Solution Approach 2:
The patent changes the material parameter from variable soil-rock mixtures to standardized phosphogypsum with controlled composition (≥90% CaSO4·2H2O). By controlling the chemical composition and physical properties of the filling material, the patent achieves uniform compaction characteristics and eliminates the reliability issues associated with heterogeneous fill materials.
2Productivity
If phosphogypsum is stockpiled in large quantities, then phosphogypsum production can continue, but land resources are wasted and geological disasters of phosphogypsum dams occur
Solution Approach 1:
The patent converts the harmful waste product phosphogypsum into a beneficial engineering material for embankment construction. By treating phosphogypsum as a viable filling material with appropriate chemical composition requirements (≥90% CaSO4·2H2O), the patent transforms an environmental hazard into a useful resource, thereby reducing stockpile accumulation and associated environmental risks while maintaining production capacity.
Solution Approach 2:
The patent enables phosphogypsum to serve its own disposal needs by using it as self-contained filling material. The material's own physical and chemical properties (low plasticity, specific density, compaction characteristics) are utilized to create stable embankment structures, eliminating the need for external disposal facilities and reducing land occupation.
3Ease of manufacture
If conventional soil and rock fillers are used in soil-deficient areas, then embankment construction can proceed, but the limitation of available filling materials becomes a constraint
Solution Approach 1:
The patent applies universality by making phosphogypsum a versatile filling material that can be used in various embankment construction scenarios, particularly in soil-deficient areas where traditional fill materials are unavailable. The material's consistent properties and ease of compaction make it universally applicable across different geographic locations and project requirements, eliminating the constraint of local material availability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances embankment strength, reduces land occupation, and effectively utilizes phosphogypsum, mitigating environmental hazards and addressing filling deficiencies in soil-scarce areas.
Implementation Method 1
weighing 90 parts by weight of phosphogypsum and 10 parts by weight of cement, and uniformly mixing and stirring the phosphogypsum and the cement to obtain a base material mixture; and weighing 2-4 parts by weight of sodium silicate, dissolving the sodium silicate in water, and adding an obtained solution to the base material mixture to obtain the phosphogypsum-containing embankment mixture
Implementation Method 2
acquiring a part of the phosphogypsum-containing embankment mixture by using an isostatic pressing method, adding water to prepare samples with different water content, and obtaining maximum dry density and optimal moisture content of the phosphogypsum-containing embankment mixture in a same compaction energy condition
Data Source
AI summary
A construction and/or installation method for using phosphogypsum in embankment improvement includes preparing a phosphogypsum-containing embankment mixture, setting moisture content of an embankment mixture, paving a modified phosphogypsum-containing embankment, and reversely layering anti-seepage cushion layers from two sides of the embankment to the center of the embankment. The preparation of a phosphogypsum-containing embankment mixture can include the following: 90 parts by weight of phosphogypsum and 10 parts by weight of cement are weighted, uniformly mixed and stirred to obtain a base material mixture; and 2-4 parts by weight of sodium silicate is weighted and dissolved in water, and an obtained solution is added to the base material mixture to obtain the phosphogypsum-containing embankment mixture. The construction and/or installation method for using phosphogypsum in an embankment improvement can satisfy embankment strength and rebound modulus requirements, and can be widely applied to a filling-deficient area and an area with a relatively high yield of phosphogypsum solid wastes.