采动过程中相似比变化影响因素分析及参数修正  

Analysis of influential factors of similarity ratio changes and parameter modification during mining

作　　者：梁冰[1,2] 石占山 孙维吉[2] 

机构地区：[1]辽宁工程技术大学矿业学院,阜新123000 [2]辽宁工程技术大学力学与工程学院,阜新123000

出　　处：《应用力学学报》2018年第4期730-736,共7页Chinese Journal of Applied Mechanics

基　　金：国家重点研发计划项目(2016YFC0801404);国家重点研发计划项目(2016YFC0600704)

摘　　要：采动作用下,相似模型设定的初始相似比会发生变化。为得到变化相似比的计算方法及影响因素,以相似材料及煤岩体仅发生弹塑性变形为前提条件,初步分析了这一阶段的应力、几何、渗透率相似比。研究表明,应力、几何、渗透率初始相似比在相似材料及煤岩体弹性变形阶段能够恒定不变的前提条件为:(1)泊松比相似比恒为1;(2)弹性模量相似比恒等于应力相似比。当模拟材料或实际煤岩体进入塑性阶段,或在弹性阶段不满足上述两条件时,需要依据公式修正相似比。同时开展采动渗透率变化相似材料模拟时,若要保证采动过程中渗透率相似比不变,在满足上述条件的基础上,还需要满足相似材料与实际煤岩体的初始孔隙度相等,否则需依据公式修正渗透率相似比。The initial similarity ratio set by similar models will change under mining action. In order to obtain the method of calculating the variable similarity ratio and the influencing factors, the stress, geometry and permeability similarity ratios at this stage are preliminarily analyzed with the premise that similar materials and coal rock masses only undergo elasticity and plastic deformation. Studies show that the prerequisites of that the initial similarity ratio of stress, geometry and permeability can be kept constant in the elastic deformation stage of similar material and coal and rock mass is that the Poisson′s ratio is constant 1 and the elastic modulus similarity ratio is equal to stress similarity ratio. When the simulated material or actual coal and rock mass enters the plastic stage, or when above two conditions are not satisfied in the elastic stage, it is necessary to modify the similarity ratio according to the formula. On the basis of satisfying above conditions and to ensure that the similarity ratio of permeability is constant during mining, it is also necessary to satisfy that the initial porosity of the similar material is equal to that of the actual coal and rock mass when to carry out similarity simulation of mining permeability during mining.

关 键 词：相似模拟 采动影响 动态相似比 相似比修正 

分 类 号：O303[理学—力学]