摘要
基于切顶短壁梁理论的切顶卸压自动成巷无煤柱开采技术已广泛应用于工程实践,但受大变形材料数值建模的限制,针对切顶短壁梁理论的矿压分布规律的数值模拟分析尚属空白。本文首先基于NPR锚杆/索在支护过程中形成的恒阻力学机制,建立了NPR锚杆/索数值模拟计算模型,实现了大变形材料数值化和程序化计算目标;其次,依托禾草沟2号煤矿1105工作面工程背景,对切顶短壁梁理论的矿压变化进行现场连续监测,并利用FLAC^(3D)程序对矿压分布规律进行数值模拟;最后对比分析了切顶短壁梁理论工作面与传统工艺下超前支撑压力分布规律的不同特征,为切顶短壁梁理论应力场分布及岩体结构时空变化规律的研究提供参考。
Based on the theory of“cutting short-wall beam”,the automatic cutting-in coal-free pillar mining technology for roof-cutting pressure relief is widely used in engineering practice.However,due to the limitation of the numerical modeling of large deformation materials,the numerical simulation analysis of mine pressure distribution based on theory of truncated short wall beam has not been studied.In this paper,the numerical simulation model of NPR bolt/cable is established at the first based on the constant resistance mechanical mechanism of the NPR bolt/cable in the supporting process,achieving the goal of numerical and programmed calculation of large deformation materials.Then,based on the background of Hecaogou No.2 coal mine engineering,mine pressure in longwall mining is continuously monitored on-site.Finally,the numerical simulations and comparative analysis of mine pressure distribution by applying theory of truncated short wall beam on 1105 working face were made through FLAC3D program.The paper reveals the different characteristics of the distribution of abutment pressure under traditional technology and the working face of theory of truncated short wall beam,and this lays a theoretical foundation for the study of stress field distribution and the rule of temporal and spatial variation of rock mass structure using theory of truncated short wall beam.
作者
安博
郑小慧
朱淳
赵军政
陶志刚
何满潮
An Bo;Zheng Xiaohui;Zhu Chun;Zhao Junzheng;Tao Zhigang;He Manchao(State Key Laboratory for GeoMechanics and Deep Underground Engineering,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Beijing 100083,China;College of Construction Engineering,Jilin University,Changchun Jilin 130026,China)
出处
《矿业科学学报》
2019年第2期102-111,共10页
Journal of Mining Science and Technology
基金
国家自然科学基金(41502323)
关键词
恒阻大变形锚杆/索
切顶短壁梁理论
数值分析
矿压分布规律
large deformation with constant resistance bolt/cable
theory of truncated short wall beam
numerical analysis
mine pressure distribution rule
