Liu Xiaosheng, Wang Weijun, Li Hao
School of Resources, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Goal Mines, Hunan University of Science and Technology, Xiangtan 411201, China.
Materials (Basel). 2025 Jul 12;18(14):3291. doi: 10.3390/ma18143291.
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 1.572.00 times and 2.002.56 times, respectively. After backfill is damaged by external forces, three-dimensional flexible mesh can also hinder the detachment of backfill fragments. The effect of the three-dimensional flexible mesh on the backfill under static pressure was calculated by using numerical simulation, and it was found that the three-dimensional flexible mesh played an effective support role for the roadway inside the backfill, effectively reducing the displacement of the roadway roof by 21.43% and the strain energy by 40%.
普通回填土具有抗压强度低、抗拉强度低、易弯曲等特点，无法满足预留巷道的稳定性要求，但可添加三维柔性网对其进行改良。本文以力学特性和位移为评价指标，通过小样本室内试验研究了最优三维柔性网，然后利用预留巷道的回填土进行了大样本相似模拟试验，最后进行了数值模拟。研究表明，三维柔性网对回填土有增强作用，尤其对回填土的抗拉强度和抗剪强度。强度分别提高了1.572.00倍和2.002.56倍。回填土受外力破坏后，三维柔性网还能阻碍回填土碎块的分离。利用数值模拟计算了三维柔性网在静压作用下对回填土的影响，发现三维柔性网对回填土内部的巷道起到了有效的支护作用，有效降低了巷道顶板位移21.43%，应变能降低了40%。
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