| 引用本文: | 周健,于仕才,张津,赵程.大理岩球形颗粒接触破碎过程与机理[J].哈尔滨工业大学学报,2018,50(6):110.DOI:10.11918/j.issn.0367-6234.201705076 |
| ZHOU Jian,YU Shicai,ZHANG Jin,ZHAO Cheng.The process and mechanism for the contact breakage of marble particles[J].Journal of Harbin Institute of Technology,2018,50(6):110.DOI:10.11918/j.issn.0367-6234.201705076 |
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| 大理岩球形颗粒接触破碎过程与机理 |
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周健1,2,于仕才1,2,张津1,2,赵程1,2
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(1.同济大学 地下建筑与工程系,上海 200092;2. 岩土及地下工程教育部重点实验室(同济大学),上海200092)
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| 摘要: |
| 为研究大理岩球形颗粒的接触破碎过程与机理，利用岩石双轴流变仪，配合特别定制的球铰支座与位移量测系统，进行了大理岩球形颗粒球-面接触与球-球接触试验，对大理岩球形颗粒接触破碎的过程、破碎形态以及试验力-位移曲线进行研究，分析了大理岩球形颗粒接触破碎的力学特性以及破碎过程的细观机理.同时在离散元方法中引入强度折减参数对接触破碎试验进行数值模拟，直观地显示了破碎发展过程，并将数值模拟结果与试验结果进行对比分析，最后总结了颗粒接触数值参数标定经验.研究表明，大理岩颗粒在法向接触力的作用下，先在颗粒接触点处产生局部破碎并逐渐形成弹性核，其存在改变了法向接触力的传递路径，弹性核被压入使颗粒产生贯通裂缝，最终发生整体破碎.引入强度折减参数的数值模型能较好拟合试验中的破碎形态，其结果是对室内试验很好的补充，能进一步明确大理岩球形颗粒接触破碎过程的细观机理.
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| 关键词: 大理岩 颗粒破碎 接触试验 数值模拟 |
| DOI：10.11918/j.issn.0367-6234.201705076 |
| 分类号:TU452 |
| 文献标识码:A |
| 基金项目:国家自然科学基金面上项目(51479138) |
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| The process and mechanism for the contact breakage of marble particles |
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ZHOU Jian1,2,YU Shicai1,2,ZHANG Jin1,2,ZHAO Cheng1,2
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(1.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2.Key Laboratory of Geotechnical and Underground Engineering (Tongji University), Ministry of Education, Shanghai 200092, China)
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| Abstract: |
| To study the marble particles' breakage process, morphology after breakage and force-displacement curve, the ball-surface and ball-ball particle contact experiments were carried out by employing Rock Rheological Testing System with customized spherical hinge bearings and a displacement measuring system, through which the mechanical properties and microscopic mechanism of marble particles' contact breakage are analyzed. The numerical simulation was performed to study the breakage process by considering the strength reduction parameter, and the result was compared with that of laboratory test, in which the experience on parameter calibration for contact simulation was introduced. This study shows that the local breakage is occurred firstly in the contact area, and then the Elastic Core is formed under normal contact force. The existing of the Elastic Core changes the path of force transfer and results in overall breakage of the particle after crack coalescence. The introduction of strength reduction parameter contributes to the simulation on the morphology after breakage. The result of numerical simulation forms a good supplement to the laboratory test, which further clarifies the microscopic mechanism of the contact breaking process of marble particles.
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| Key words: marble particle breakage contact test numerical simulation |
