摘要
对松藻煤电集团打通一矿7号软煤层制备的型煤围压作用下不同载荷水平进行了煤岩蠕变试验研究。通过改变蠕变载荷,得到了不同蠕变载荷作用下完整的蠕变3阶段曲线和各蠕变阶段的蠕变特征。根据试验分析结果,得到围压作用下煤岩蠕变规律和各蠕变阶段的蠕变参数。研究表明,随着蠕变载荷的增加,起始蠕变量和加速蠕变阶段的蠕变加速度均呈增加趋势,而过渡蠕变阶段和稳定蠕变阶段的持续时间与蠕变载荷关系不明显。黏弹塑性本构模型能够较好地反映围压作用下煤样的蠕变本构关系,通过计算得到了相关蠕变模型的参数。
Creep tests under different levels of loads have been performed on briquette under confining pressure of Datong #7 mine belongs to Songzao coal-electricity group. Through changing the level of creep loads, integrate three-stage curves and characteristics of each of creep steps are obtained. According to the analysis of the experimental results, laws and parameters of each of creep steps under confining pressure are obtained, both initial amount of creep and creep acceleration of acceleration creep phase showed an increasing trend as the addition of creep loadings, but the relationship between lasting time of transfer and stable creep steps with creep loadings showed non-regularity; and constitutive relation of briquette can be reflected by cohesive-elastic-plastic model. Based on calculation, parameters of cohesive-elastic-plastic model are obtained.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第8期2305-2308,共4页
Rock and Soil Mechanics
基金
国家重点基础研究发展计划(973计划)(No.2005CB221502)
国家自然科学基金重点项目(No.50534080)
重庆市自然科学基金计划重点项目(No.CSTC
2008BA6028)
关键词
型煤
蠕变
本构关系
围压
黏弹塑性模型
briquette
creep
constitutive relation
confining pressure
cohesive-elastic-plastic model
