A Study on Three-Dimensional Flexible Mesh Influence on the Stability of Reserved Tunnels in Cemented Backfill
Xiaosheng Liu, Weijun Wang, Hao Li
TL;DR
This study shows how adding a 3D flexible mesh improves the stability of tunnels filled with cemented backfill.
Contribution
The novel contribution is the experimental and numerical validation of a 3D flexible mesh's effectiveness in enhancing backfill stability.
Findings
Three-dimensional flexible mesh increased backfill tensile strength by 1.57–2.00 times and shear strength by 2.00–2.56 times.
The mesh reduced roadway roof displacement by 21.43% and strain energy by 40% under static pressure.
The mesh also hindered detachment of backfill fragments after damage from external forces.
Abstract
Ordinary backfill has characteristics such as low compressive strength, low tensile strength, and easy bending, which cannot meet the stability requirements of reserved tunnels, but three-dimensional flexible mesh can be added to improve it. In this paper, mechanical characteristics and displacement were taken as the evaluation index, an optimal three-dimensional flexible mesh was studied by a laboratory experiment of small samples, then backfill with a reserved roadway was used to carry out a large-sample similarity simulation experiment, and finally, a numerical simulation was carried out. The research shows that the three-dimensional flexible mesh had a strengthening effect on the backfill, especially on the tensile strength and shear strength of the backfill. The strengths increased by 1.57~2.00 times and 2.00~2.56 times, respectively. After backfill is damaged by external forces,…
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Taxonomy
TopicsTailings Management and Properties · Geotechnical Engineering and Underground Structures · Rock Mechanics and Modeling