采矿与安全工程学报Issue(5)：679-685,7.
考虑刚度和强度劣化时弱胶结软岩巷道围岩的弹塑性损伤分析
Elastic-plastic damage analysis for weakly consolidated surrounding rock regarding stiffness and strength cracking
摘要
Abstract
The cracking of stiffness and strength, due to existing and development of micro cracks in elastic region, causes the loosening scope of roadway surrounding rock expanded. By defining stiffness cracking coefficient and strength cracking factor, considering characteristics of strain softening and plastic dilatancy after post-peak, the article established an elastic-plastic flow damage model for weakly consolidated soft rock under non-uniform initial stress field on the basis of damage theory and strain softening model with three linear steps; inferred analytical solutions of stresses, displacements when surrounding rock generate three different failure areas:elastic zone, elastic and plastic softening zone, and plastic flow zone;and discussed the rule on the influence of original rock stress, strength cracking, dilatancy gradient of soft surrounding rock in Luxin coal mine on damage evolution, displacement and plastic circle of surrounding rock. Results show that dilatancy gradient has great effect on damage speed and displacements in plastic zone while it has little effect on the size of plastic circle and stress res-ponses; that original rock stress level has remarkable influence on the distribution of plastic circle of the roadway; and that the rising of stiffness and strengthen cracking coefficient will accelerate the cracking speed of surrounding rock, which should be paid enough attention in analyzing the stability of the surrounding rock and designing weakly consolidated soft rock tunnel.关键词
弱胶结软岩/巷道围岩/刚度劣化/强度劣化/非均匀应力场/损伤演化Key words
weakly consolidated soft rock/tunnel surrounding rock/stiffness cracking/strength cracking/non-uniform stress field/damage evolution分类
矿业与冶金引用本文复制引用
王渭明,赵增辉,王磊..考虑刚度和强度劣化时弱胶结软岩巷道围岩的弹塑性损伤分析[J].采矿与安全工程学报,2013,(5):679-685,7.基金项目
国家自然科学基金项目(51174128)；高等学校博士学科点专项科研基金项目(20123718110007) （51174128）
