摘要
以煤(岩)为研究对象,开展水体浸润试验、电镜扫描试验、含水率试验、单轴压缩试验及分别加载蠕变试验,系统研究了应力水平和浸润时间对煤(岩)蠕变特性的影响;定义了基于宏观基准量的浸润损伤变量、基于蠕变时效性的应力损伤变量及耦合作用下的总损伤变量,表述了浸润-应力耦合效应对总损伤变量的影响规律;将总损伤变量引入流变基本元件中,将虎克体、凯尔文体、牛顿体及带有开关元件的损伤体串联描述煤(岩)蠕变全过程,建立了考虑浸润-应力耦合作用下煤(岩)非线性蠕变损伤本构模型,分析了浸润时间和应力水平对煤(岩)蠕变参数的影响规律。结果表明:煤(岩)总损伤演化途径反映了细观力学响应与宏观变形破坏特征的一致性,刻画出浸润与应力2种作用因素对煤(岩)总损伤扩展的非线性影响特征,为揭示浸水煤柱失稳破坏机制提供理论依据。
In this paper,the influence of stress level and infiltration time on the creep properties of coalrock was systematically studied after the water infiltration test,electron microscope scanning test,water content test,uniaxial compressive strength test and creep mechanical properties test.The infiltration damage variable based on macro-benchmark variable,the stress damage variable based on creep timeliness and the total damage variable under coupling action are defined,that characterized the influence law of the infiltration-stress coupling action on the total damage variable.The total damage variable was introduced into the rheological basic elements,and the Hooke body,Kelvin body,Newton body and damage body with switching elements in series were used to describe the whole process of coal-rock creep.A nonlinear creep damage constitutive model of coal-rock under the consideration of infiltration-stress couplingwas established,and the influence law of infiltration time and stress level on creep parameters ofcoal-rock was analyzed. The total damage evolution pathway of the coal-rock reflected the mesoscopicmechanical response consistent with the macroscopic deformation damage characteristics and portrayedthe non-linear influence characteristics of the two action factors of infiltration and stress on the total damageextension of the coal-rock. It provided a theoretical basis for revealing the destabilization and damagemechanism of infiltrated coal columns.
作者
张慧梅
王赋宇
李焕容
杨更社
申艳军
刘慧
路亚妮
ZHANG Huimei;WANG Fuyu;LI Huanrong;YANG Gengshe;SHEN Yanjun;LIU Hui;LU Yani(School of Science,Xi’an University of Science and Technology,Xi’an,Shaanxi 710054,China;College of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an,Shaanxi 710054,China;College of Geology and Environment,Xi’an University of Science and Technology,Xi’an,Shaanxi 710054,China;School of Civil Engineering,Hubei Engineering University,Xiaogan,Hubei 432000,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2023年第2期399-407,共9页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(12172280,42077274,41702339,41907259)
陕西省自然科学基金重点项目(2020JZ-53)。
关键词
煤(岩)蠕变
浸润时间
应力水平
损伤变量
试验研究
coal-rock creep
infiltration time
stress level
damage variables
experimental research
