Segmented Grouting Slurry for Aquifer Repair
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Solution Overview
Problem
In aquifer restoration through grouting in mining areas, the slurry injected encounters dynamic water with high velocity, leading to significant dilution and a low retention rate, necessitating excessive slurry usage.
Innovation Solution
The method employs segmented grouting comprising scour and migration, splitting and diffusion, and sedimentation and compaction grouting, using slurries with varying specific gravities and pump volumes to improve slurry retention and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grouting is used to repair aquifers, then the aquifers can be restored, but the slurry is greatly diluted by dynamic water and split rock mass, resulting in extremely low retention rate and excessive slurry consumption
Solution Approach 1:
The grouting process is divided into three distinct stages: scour and migration grouting (first slurry), splitting and diffusion grouting (second slurry), and sedimentation and compaction grouting (third slurry). Each stage uses slurry with different specific gravity and pump volume parameters to achieve specific objectives, transforming the single-stage conventional grouting into a multi-stage segmented process that improves slurry retention rate by 89%
Solution Approach 2:
The patent systematically changes slurry parameters across the three grouting stages: the first slurry has lower specific gravity and higher pump volume for scouring; the second slurry has medium specific gravity and medium pump volume for splitting and diffusion; the third slurry has higher specific gravity and lower pump volume for sedimentation and compaction. This parameter optimization resolves the contradiction between restoration effectiveness and slurry retention
2Reliability
If conventional grouting is used to repair aquifers, then the aquifers can be restored, but a large amount of slurry is required, increasing grouting cost and material consumption
Solution Approach 1:
By segmenting the grouting process into three stages with progressively optimized slurry parameters, the patent achieves effective aquifer restoration with significantly reduced total slurry consumption. The segmented approach ensures each unit of slurry performs its specific function efficiently, reducing overall material requirements while maintaining restoration effectiveness
Solution Approach 2:
The systematic optimization of slurry parameters (specific gravity and pump volume) across the three grouting stages enables reduced slurry consumption. The third slurry with higher specific gravity and lower pump volume provides compaction with minimal material, while the progressive parameter changes ensure each stage uses the minimum necessary slurry quantity for its specific objective
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 approach reduces the amount of slurry required by up to 89%, effectively sealing cracks, minimizing shallow water resource loss, and maintaining aquifer stability.
Implementation Method 1
slurry can be pumped into an area of sudden water inrush through drilling
Implementation Method 2
slurry will be greatly diluted by the dynamic water and the split rock mass
Implementation Method 3
the first specific gravity is less than the second specific gravity; the second specific gravity is less than the third specific gravity
Implementation Method 4
the sedimentation and compaction grouting may use a third slurry with a third specific gravity and a third pump volume for grouting
Data Source
AI summary
Disclosed is a method of segmented grouting for repairing aquifers in a mining area after mining. The method may include: drilling a grouting hole in a ground area corresponding to a water inflow position in a goaf; and performing a segmented grouting in a target grouting layer through the grouting hole. The segmented grouting may include: a scour and migration grouting, a splitting and diffusion grouting, and a sedimentation and compaction grouting. The scour and migration grouting may use a first slurry with a first specific gravity and a first pump volume for grouting. The splitting and diffusion grouting may use a second slurry with a second specific gravity and a second pump volume for grouting. Moreover, the sedimentation and compaction grouting may use a third slurry with a third specific gravity and a third pump volume for grouting.