摘要
经过多年的科学研究和工程实践证明,采动卸压瓦斯抽采技术是防治煤与瓦斯突出、降低煤层瓦斯含量最有效、最经济的区域性措施。尽管近几十年来开展了大量的采动卸压瓦斯抽采现场试验,但对采动煤岩体变形与卸压瓦斯流动相互作用的研究尚不够成熟,还无法为卸压瓦斯的高效抽采提供理论基础和技术支持。以远程采动煤岩体为研究对象,运用岩石力学、采矿工程、渗流力学、数值仿真等理论,采用现场实验、实验室实验、理论分析和数值分析相结合的研究方法,系统研究了采动煤岩体的卸压特征、移动变形、采动应力变化及卸压瓦斯流动规律;开展了采动煤岩体变形与瓦斯流动耦合作用研究,构建了采动煤岩体弹脆塑性本构模型和采动煤岩体变形与瓦斯流动耦合动力学模型及数值计算方法,通过模型的应用初步获得了远程上被保护层应力场、位移场与渗透率的时空变化规律,最后提出了保护层开采工程分类及判定方法,以及远程保护层开采及卸压瓦斯抽采技术体系,并在阳泉新景矿成功地进行了试验,取得了显著的抽采效果。为保护层开采设计及远程被保护层卸压瓦斯的高效抽采提供了理论依据和技术支持。主要研究内容及成果有:(1)利用平面应变相似模拟实验系统,以阳泉矿区新景矿为地质背景,开展了远程采动煤岩体裂隙演化相似模拟试验研究,获得了远程被保护层采动应力、裂隙发育和变形的时空演化规律;(2)基于Drucker-Prager准则,引入理想弹脆塑性模型和内切圆准则,构建了采动煤岩弹脆塑性损伤本构模型及数值格式,采用VC++2005将其开发成FLAC3D能够调用的模型,并开展了模型验证与应用,为采动煤岩体变形的研究提供了本构模型;(3)构建了反映采动裂隙、离层对瓦斯流动影响的非线性卸压瓦斯流动方程———广义幂定律,为采动煤岩体卸压瓦
The pressure-relief gas drainage technique is the most effective and economical regional method to decrease gas content and eliminate coal and gas outburst from many years＇ practices and studies.In recent decades,many field tests was operated on pressure-relief gas drainage due to mining,however,the interaction between the deformation and pressure-relief gas flow of coal and rock mass is not considerate enough to provide the theory and method for efficient pressure-relief gas drainage.By taking coal and rock mass due to mining as the research object,the combination methods of laboratory experiment,filed experiment,theoretical analysis and numerical analysis are used to research on mechanical characteristic,movement,deformation,pressure relief and seepage characteristic of overlying coal and rock masses.Carried on the interaction between the deformation and pressure-relief gas flow,and then set up elasto-brittle-plastic constitutive model of coal rock mass damage due to mining and fully coupled model and numerical solution for deformation and pressure-relief gas flow.The research provides theoretical basis and reference for the design of protective layer mining and relief-pressure gas drainage.The main aspects can be seen as the following：（1） A similar experiment for fissure evolution of remote coal and rock mass due to mining,obtained the space-time change law of mine-induced stress,fracture development and deformation in the remote protected layer.（2） The elasto-brittle-plastic constitutive model of coal rock mass damage due to mining was set up based on the plastic flow format of Drucker-Prager constitutive model by introducing the inscribed circle criterion and the ideal brittle-plastic model,and validated by comparing with the traditional constitutive models through uniaxial and triaxial compression numerical tests.（3） Considering the nonlinear characteristics of the pressure-relief gas flow effecting by the mine-induced fracture and separation,the generalized power law was set up to study the
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2011年第7期1243-1244,共2页
Journal of China Coal Society
基金
国家重大基础研究发展计划(973)资助项目(2005CB221503)
关键词
远程采动煤岩体
弹脆塑性
非线性渗流
气固耦合模型
保护层开采
卸压瓦斯抽采
remote mine-induced coal and rock mass
elasto-brittle-plasticity
nonlinear seepage
gas-solid coupled model
protective layer exploitation
pressure-relief gas drainage
