块石胶结充填体循环加卸载损伤特性研究  

Study on Damage Characteristics of Cyclic Loading and Unloading of Ballast Cemented Backfilling Body

作　　者：冯萧[1] 曹世荣 卓毓龙 王晓军[1] 肖伟晶 李永欣[1] 

机构地区：[1]江西理工大学江西省矿业工程重点实验室,江西赣州341000

出　　处：《有色金属工程》2016年第6期82-86,95,共6页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助(51304083);江西省科技支撑计划项目(20141BBE50005)

摘　　要：在RMT-150C岩石力学试验系统上对四种不同块石含量胶结充填体试件进行单轴压缩和逐级循环加卸载试验,得到其损伤破坏全过程应力—应变曲线;通过分析各组循环过程应变与动弹性模量变化,发现块石胶结充填体卸载点应力水平由低到高的每个循环过程中,试件呈现先强化后劣化的规律,且适量块石的加入可提升充填体强化过程。采用改进的混凝土分段损伤本构模型对循环加卸载下的块石胶结充填体受压破坏应力—应变曲线外包络线进行拟合,理论曲线与试验曲线吻合度较高,此模型对块石胶结充填体循环加卸载损伤破坏过程描述较为准确。Four kinds of ballast cemented backfilling bodies with different ballast contents were tested in RMT-150C testing system. Uniaxial compression and cyclic loading and unloading tests of grade by grade were performed; the stress-strain curves of the whole process were obtained. By analyzing the variation of strain and dynamic elastic modulus, the test piece was found to be strengthened in the low stress level deterioration under high stress level cyclic loading and unloading, and the strengthening process of backfilling body can be enhanced by adding a proper amount of ballast. The damage constitutive model of concrete is used to fit the curve, and the fitting degree is good. The model is more accurate in the description of the damage process of the ballast cemented backfilling body with cyclic loading and unloading.

关 键 词：块石 胶结充填体 加载 卸载 损伤 

分 类 号：TD35[矿业工程—矿井建设]