软岩大巷围岩裂隙演化机制与控制研究
Study on the evolution mechanism and control of fractures in the surrounding rock of soft rock roadway
陈海俊 1陈勇2
作者信息
- 1. 山西焦煤集团西山煤电南岭公司,山西 太原 030000
- 2. 中国矿业大学煤炭精细勘探与智能开发全国重点实验室,江苏 徐州 221116
- 折叠
摘要
本文以南岭煤业 52采区进风大巷为研究对象,剖析了软岩大巷变形破坏特点及裂隙演化机制,以期有效解决软岩大巷面临的剧烈变形、失稳等工程难题.首先,根据软弱岩体应力-应变关系,及其与围岩强度变化之间的相互作用关系,构建了能够描述圆形巷道破坏分区现象的力学模型,明晰了软岩大巷围岩弹塑性变形分区破坏特征,揭示了深井软岩大巷围岩的变形破坏机理.其次,基于UDEC-Trigon方法,构建了符合工程尺度的离散元数值计算模型,并提出了针对该模型的参数校正方法.通过模拟研究,探讨了软岩大巷围岩的裂隙扩展特征、应力分布规律、巷道变形规律.最后,提出了深浅部注浆与高强高预紧力锚杆索支护的软岩大巷控制技术及相应参数,并在南岭煤业 52采区进风大巷成功应用.应用结果表明:锚杆索+注浆联合控制技术有效控制了 52采区进风大巷的变形量,提高了巷道稳定性.本文研究成果为软岩大巷围岩变形稳定控制提供了理论依据和技术支撑.
Abstract
In order to effectively address the technical challenges posed by severe deformation and instability in soft rock roadways,this paper focusing on the inlet roadway in the 52 mining area in Nanling Coal Industry,conducting analysis of the deformation and failure characteristics of soft rock roadway.Based on the stress-strain relationship of soft rock and its correlation with the strength changes of surrounding rock,a mechanical model is constructed to describe the failure zones in circular roadways.This model further reveals the elastoplastic deformation partitioning features of the surrounding rock in soft rock roadways and elaborates on the deformation and failure mechanisms in deep mine soft rock roadways.Utilizing the UDEC-Trigon model,a numerical model compliant with engineering scales is established,and a parameter correction method tailored for this model is proposed.Through simulation studies,a detailed exploration is conducted on the crack propagation characteristics,stress distribution patterns,and deformation behaviors of the surrounding rock in soft rock roadways.On this basis,a control technology and corresponding parameters are put forward for soft rock roadways,combining shallow and deep grouting with high-strength and high-pre-tightening force bolt-cable support.Field practice validation demonstrates that this technology significantly enhances the bearing capacity of the surrounding rock in soft rock roadways and effectively controls the deformation.The findings of this paper provide theoretical support and technical guidance for the reinforcement of surrounding rock in soft rock roadway under similar geological conditions.
关键词
软岩大巷/破坏机理/UDEC-Trigon修正模型/裂隙扩展/矿压观测Key words
soft rock roadway/failure mechanism/UDEC-Trigon modified model/crack propaga-tion/mine pressure observation引用本文复制引用
基金项目
国家重点研发计划项目资助(2021YFC2902105)
国家自然科学基金项目资助(52174135)
吕梁市校地合作重点研发专项资助(2022XDHZ16)
出版年
2024
NETL
NSTL
万方数据