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Related Experiment Video

Updated: Jun 13, 2026

Determination of the Mechanical Properties of Flexible Connectors for Use in Insulated Concrete Wall Panels

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Published on: October 19, 2022

Mechanical Behavior and Failure Modes of Cemented Backfill Under Impact Loading.

Xiaohua Zhang¹, Zhiyong Yang^2,3, Xianglong Li^1,4

¹Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China.

Materials (Basel, Switzerland)

|June 12, 2026

Summary

Cemented backfill (CTB) subjected to dynamic disturbances shows increased strength but also damage with higher impact loads. Reducing these loads is key to maintaining CTB stability and load-bearing capacity in mining.

Keywords:

cemented backfill crack propagation dynamic response fractal dimension microstructure

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Published on: December 20, 2024

Area of Science:

Geotechnical Engineering
Materials Science
Mining Engineering

Background:

Cemented backfill (CTB) is vital for mine stability but vulnerable to dynamic disturbances from blasting.
Understanding CTB's response to these disturbances is crucial for preventing catastrophic failures.

Purpose of the Study:

To characterize the dynamic mechanical response and failure mechanisms of CTB under impact loading.
To investigate the relationship between impact load, damage severity, and crack evolution in CTB.

Main Methods:

Split Hopkinson pressure bar (SHPB) tests were used to assess dynamic mechanical properties.
Scanning electron microscopy (SEM) examined microstructural features and hydration products.
High-speed imaging captured crack propagation and evolution.

Main Results:

Dynamic compressive strength (DCS) increased with impact load, but so did damage severity.
Fractal dimensions of crack evolution ranged from 0.5 to 1.3, correlating with increased cracking and damage.
Microstructure analysis revealed ettringite (AFt) and C-S-H gel as strength contributors, but microcracks limited inherent strength.

Conclusions:

Higher dynamic loads increase CTB strength but also lead to greater damage and failure probability.
Microstructural features like ettringite and C-S-H gel are critical for CTB cohesion.
Mitigating dynamic loads during mining is recommended to enhance CTB stability and performance.