Grouted Rock Mass Ductility Evaluation Method
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Solution Overview
Problem
Current evaluation methods for the ductility of grouted rock mass in water-sand mixture inrush prevention areas are inadequate as they fail to consider the interaction between grouting materials and rock mass lithology, leading to inaccurate and unquantified assessments of rock mass ductility post-grouting.
Innovation Solution
An evaluation method that integrates factors such as spatial distribution of cracks, rock mass quality, strain softening index, unstable fracture ductility, and permeability strength to quantify the ductility of grouted rock mass, using specific formulas to calculate an evaluation index R that grades the ductility of the grouted rock mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional evaluation methods are used that only consider grouting materials and rock mass lithology, then the evaluation process is simple, but the evaluation accuracy is poor due to ignoring the interaction between grouting materials and rock mass
Solution Approach 1:
The patent merges multiple evaluation factors including grouting materials, rock mass lithology, crack spatial distribution, and their interactions into a unified comprehensive evaluation system. This integration allows the method to capture the complex interactions between grouting materials and rock mass, significantly improving evaluation accuracy while maintaining systematic organization through a unified evaluation index system.
Solution Approach 2:
The patent introduces multiple parameters including strain softening index, unstable fracture ductility, and permeability strength to comprehensively characterize the ductility of grouted rock mass. By changing from single-parameter to multi-parameter evaluation, the method captures the complex mechanical behavior and interaction effects, thereby improving measurement precision without excessive complexity.
2Measurement precision
If conventional evaluation methods are used that do not quantify ductility results, then the evaluation process is simple, but the evaluation results cannot accurately assess the ductility of grouted rock mass
Solution Approach 1:
The patent transforms qualitative assessment into quantitative evaluation by introducing specific parameters: strain softening index to measure post-peak stress-strain behavior, unstable fracture ductility to characterize fracture propagation resistance, and permeability strength to evaluate fluid flow resistance. These parameters provide numerical values that accurately quantify ductility, enabling precise assessment of grouted rock mass performance.
Solution Approach 2:
The patent establishes a feedback mechanism where the calculated ductility parameters feed back into the evaluation of grouting quality and rock mass stability. The quantified results provide actionable feedback for assessing whether the grouted rock mass can withstand mining-induced deformations, enabling continuous improvement of grouting design and construction.
3Reliability
If a comprehensive evaluation system with multiple factors is implemented, then the evaluation accuracy improves, but the complexity of the evaluation method increases
Solution Approach 1:
The patent segments the comprehensive evaluation system into distinct modules: crack spatial distribution analysis, strain softening index calculation, unstable fracture ductility assessment, and permeability strength evaluation. Each module focuses on a specific aspect of ductility, making the complex evaluation process more manageable and systematic while maintaining high reliability through comprehensive coverage of all critical factors.
Solution Approach 2:
The patent merges the results from multiple segmented evaluation modules into a unified ductility assessment framework. By combining crack distribution patterns, strain softening characteristics, fracture ductility metrics, and permeability strength data, the system achieves comprehensive and reliable evaluation of grouted rock mass ductility, ensuring that all critical factors are considered together.
Data Source
AI summary
Provided is an evaluation method of ductility of a grouted rock mass for advanced renovation of a water-sand mixture inrush prevention area including following steps: first, acquiring a spatial distribution law of cracks in overlying strata, and establishing a three-dimensional geological model and a grouted rock mass unit geological model; calculating rock mass quality standard of the target rock strata; performing compression tests on multiple groups of grouted consolidated bodies, and calculating an average value of strain softening indexes of the multiple groups of grouted consolidated bodies; selecting multiple groups of grouted target rock strata, and calculating an average value of unstable fracture ductility of the multiple groups of grouted target rock strata; finally, acquiring a permeability strength of the grouted rock mass, and calculating and grading an evaluation index of ductility of the grouted rock mass,