摘要
考虑了裂隙倾角对岩体渗透系数的影响,运用断裂力学理论中压剪断裂判据,分析了采动影响下岩体中易破坏的优势角裂隙。在此基础上,建立了采场裂隙岩体优势角应力与渗透性耦合力学模型,计算了采场周围岩体的应力变化,推导了采场平面应力状态下零位破坏带渗透系数方程,分析了渗透系数比及其影响因素的关系。
In this paper, we would like to present our research results on the penetrability of the floor rock in the stope in coal mining production. Taking the stope near an aquifer for an example, the paper puts its research focus on the stress redistribution after the coal is mined and penetrability of the stope has changed its regularity. It is from this research perspective that we have developed a stress-permeability interactive model and the equation of the permeability variation by using the fracture mechanics theory and elastic mechanics. In proceeding with our research, we first of all took into full account the effect of crack dip on the permeability of fractured rock, which is likely to be responsible for the destruction of the dominant angle of the fracture by coal mining and by the criterion of compression-shear fracture according to the fracture mechanics theory based on the influence of seepage water pressure. Secondly, based on the dominance angle and the stress-permeability model for fractured rock mass, we have established a stress-permeability interactive model of the dominance angle of the floor fractured rock in the stope. The stress distribution of the stope has been worked out according to the fracture mechanics theory, though it can only be applied to the end of the stope. We have then worked out the equation of permeability zero position failure zone and the stress distribution around the stope through an improved calculation. And, finally, we have established the stress-permeability interactive model of dominance angle of floor rock in the plane stress state by integrating the redistribution of stresses, with the relation of the seepage coefficient ratio and its affecting factors further analyzed. The results show that the permeability of zero position with zone failure and gob increases by the coal mining. And, then, the permeability would be found increasing with the increase of pressure release. Thus, it can be seen that the stress-permeability interactive model and the equation of the permeab
出处
《安全与环境学报》
CAS
CSCD
北大核心
2012年第5期223-226,共4页
Journal of Safety and Environment
基金
国家自然科学基金项目(51074003
51074005)
国家自然科学基金委员会与神华集团有限公司联合资助项目(51174255)
高等学校博士学科点专项科研基金项目新教师类(20093415120001)
中国博士后科学基金项目(2011M501037)
安徽省优秀青年科技资助项目(10040606Y31)
淮南市科技计划项目(2011A07921)
关键词
采矿工程
优势角
渗透系数
压剪断裂判据
mining engineering
dominance angle
permeability co-efficient
criterion of compression-shear fracture
