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Study on the Macro-Micro Mechanical Properties of Grout Consolidated Coal under Different Loading Rates
Hongyu Pan1, Junyan Wang1, Guanyi Du1
1College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
Materials (Basel, Switzerland)
|December 23, 2022
Summary
This study investigates how loading rates affect the strength and microscopic properties of sealed boreholes. Higher loading rates generally increase strength, with a critical rate identified for optimal consolidation.
Area of Science:
- Geotechnical Engineering
- Materials Science
- Rock Mechanics
Background:
- Borehole sealing is crucial for underground stability and resource extraction.
- Understanding the mechanical behavior of consolidated coal-grout materials is essential for effective sealing.
Purpose of the Study:
- To investigate the macroscopic and microscopic mechanical properties of consolidated coal-grout bodies.
- To establish the relationship between loading rates, porosity, fractal dimension, and uniaxial compressive strength (UCS).
Main Methods:
- Analysis of macroscopic compressive strength, microscopic interface bending, porosity, and fractal dimension.
- Establishment of a structure-strength relationship using multivariate nonlinear regression.
Main Results:
- Loading rates significantly impact macro- and micro-mechanical properties.
- Uniaxial compressive strength (UCS) and elastic modulus increase with loading rates up to a critical point (0.4 mm/min).
- Microscopic properties (interface bending, porosity, fractal dimension) show a trend of increasing then decreasing with loading rates.
Conclusions:
- Loading rate is a critical factor influencing the mechanical integrity of consolidated boreholes.
- Fractal dimension is linearly correlated with UCS and porosity.
- A multivariate nonlinear relationship exists between loading rates, porosity, fractal dimension, and UCS.
Keywords:
consolidation bodygroutloading ratemacro-micro mechanical characteristicsthe compressive strengthMore Related Videos
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