State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology
Shanxi Heshun Longhua Coal Industry Co. , Ltd.
Mining Management Branch of Jizhong Energy Handan Mining Group Co. , Ltd.

为了解决深部充填开采过程中矸石胶结充填体韧性差,易发生脆性破坏、失稳的问题,提出了采用废弃轮胎钢纤维改善矸石胶结充填体的力学性能。通过单轴压缩试验,研究了掺废弃轮胎钢纤维矸石胶结充填体的应力应变曲线特征、本构模型及废弃轮胎钢纤维的作用机制。结果表明:掺废弃轮胎钢纤维充填体的峰值应变显著提高,但峰值应力下降,峰后曲线平缓,残余强度较高,充填体由脆性破坏转为延性破坏;建立的修正本构模型能较好地反映掺废弃轮胎钢纤维充填体的应力-应变关系和残余强度特征;通过电镜扫描观察发现废弃轮胎钢纤维不定向嵌入于充填体基体中,与水化产物粘结,产生阻裂效应,提高了充填体的韧性。研究成果可为废弃轮胎钢纤维改性矸石胶结充填体提供理论依据与工程设计参考。

In order to solve the problems of poor toughness, easy brittle failure and instability of gangue cemented backfill during deep filling mining, waste tire steel fiber is used to improve the mechanical properties of gangue cemented backfill. The stress-strain curve characteristics, constitutive model and the action mechanism of waste tire steel fiber are studied by uniaxial compression test. The results show that the peak strain increases significantly, but the peak stress decreases. The post-peak curve is gentle, and the residual strength is high, and the filling body changes from brittle failure to ductile failure. The modified constitutive model can reflect the stress - strain relationship and the residual strength characteristics of steel fiber backfill mixed with waste tire. The scanning electron microscopy showed that the waste tire steel fiber is not directional embedded in the backfill matrix, and bonded with the hydration products, resulting in crack resistance effect, which increase the toughness of the backfill. The research can provide a theoretical basis and engineering design reference for steel fiber modified gangue cemented backfill of waste tire.

国家自然科学基金项目(52274143)

刘阳,曹胜根,车驰远,等.废弃轮胎钢纤维改性充填体本构模型研究[J].煤炭工程,2024,56(12):140-146.