抛石基床振动密实颗粒流数值模拟研究
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摘要
振动密实法是提高抛石基床承载力的一种方法,它通过重锤振动使小颗粒物质挤入孔隙,增加介质密实度进而提高承载力。采用振动密实法必须选择合理的工艺参数,包括振动遍数、振动锤质量等,其选取缺少理论依据。基于工程实践中的随机抛石尺寸,通过随机填充法形成颗粒簇,利用颗粒流数值模拟软件PFC2D,探讨了振动密实抛石基床的动态作用过程及遍数、锤重对密实度的影响。结果表明基床获得最佳密实时重锤的质量为8 t,振动次数为6遍,此时振动效果最佳。研究成果可为抛石基床振动锤的选用和深化认识振动密实法的作用机制提供参考。
Vibration compaction is used as a way to improve the capacity of rubble bed.By vibration,small particles are made into pore to increase the compactness of medium.Then,the bearing capacity can be improved.Vibration compaction must select reasonable parameters,such as vibration times and the vibration hammer mass.But because of the lack of theoretical basis,how to select reasonable parameters became a problem.Based on the size of random rubble in site,PFC2 D is adopted to establish the model,and effect of vibration process,vibration times and vibration hammer mass are discussed.It concludes that when vibration hammer mass is 8 t and the vibrating times is 6 times,the compaction effect is most obvious.The research findings can provide reference to vibration compaction.
Vibration compaction is used as a way to improve the capacity of rubble bed.By vibration,small particles are made into pore to increase the compactness of medium.Then,the bearing capacity can be improved.Vibration compaction must select reasonable parameters,such as vibration times and the vibration hammer mass.But because of the lack of theoretical basis,how to select reasonable parameters became a problem.Based on the size of random rubble in site,PFC2 D is adopted to establish the model,and effect of vibration process,vibration times and vibration hammer mass are discussed.It concludes that when vibration hammer mass is 8 t and the vibrating times is 6 times,the compaction effect is most obvious.The research findings can provide reference to vibration compaction.
引文
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7 王海礼,石崇,王盛年,等.多元混合介质骨料的随机构形生成方法及应用.岩石力学与工程学报,2014;33(Z1):2827—2834Wang Haili,Shi Chong,Wang Shengnian,et al.Method of random configuration generation for polybasic mixed medium and its application.Chinese Journal of Rock Mechanics and Engineering,2014;33(Z1):2827—2834
8 石崇,王盛年,刘琳.地震作用下陡岩崩塌颗粒离散元数值模拟研究.岩石力学与工程学报,2013;32(Z1):2798—2805Shi Chong,Wang Shengnian,Liu Lin.Research of avalanche disaster numerical simulation based on granular discrete element method of high-steep slope under seismic loads.Chinese Journal of Rock Mechanics and Engineering,2013;32(Z1):2798—2805
9 王海礼,石崇,王盛年,等.随机散粒岩土材料自然堆积2D数值仿真分析.三峡大学学报(自然科学版),2013;35(5):73—77Wang Haili,Shi Chong,Wang Shengnian,et al.2D numerical simulation analysis of natural accumulation of stochastic particles geotechnical materials.J of China Three Gorges Univ(Natural Sciences),2013;35(5):73—77
2 陶松垒,李祖兴,张子和,等.防波堤抛石基床的水下爆夯方法.工程爆破,1998;4(1):39—45Tao Songlei,Li Zuxin,Zhang Zihe,et al.Under water blasting tamping method of break water rubbled.Engineering Blasting,1998;4(1):39—45
3 张清峰.强夯加固煤矸石地基物理模拟试验研究.铁道建筑,2010;(2):52—54Zhang Qingfeng.Study on numerical simulation of multi-point single compaction for dynamic compaction consolidation of gangue foundation.Railway Engineering,2010;(2):52—54
4 冯世进,水伟厚,梁永辉.高能级强夯加固粗颗粒碎石回填地基现场试验.同济大学学报(自然科学版),2012;40(5):679—684Feng Shijin,Shui Weihou,Liang Yonghui.Field test evaluation of high energy dynamic compaction on coarse-grained gravel fills.Journal of Tongji University(Natural Science),2012;40(5):679—684
5 Majdi A,Sharifi S A,Litkouhi S.Mitigation of liquefaction hazard by dynamic compaction.Proceedings of the ICE-Ground Improvement,2007;11(3):137—143
6 王桂尧,胡振南,匡希龙.红砂岩路基强夯处理大变形数值模拟方法与效果分析.岩土力学,2008;29(9):2451—2456Wang Guiyao,Hu Zhennan,Kuang Xilong.Large-strain numerical simulation and experimental result reseach about improving red-sandstone embankment by dynamic compaction.Rock and Soil Mechanics,2008;29(9):2451—2456
7 王海礼,石崇,王盛年,等.多元混合介质骨料的随机构形生成方法及应用.岩石力学与工程学报,2014;33(Z1):2827—2834Wang Haili,Shi Chong,Wang Shengnian,et al.Method of random configuration generation for polybasic mixed medium and its application.Chinese Journal of Rock Mechanics and Engineering,2014;33(Z1):2827—2834
8 石崇,王盛年,刘琳.地震作用下陡岩崩塌颗粒离散元数值模拟研究.岩石力学与工程学报,2013;32(Z1):2798—2805Shi Chong,Wang Shengnian,Liu Lin.Research of avalanche disaster numerical simulation based on granular discrete element method of high-steep slope under seismic loads.Chinese Journal of Rock Mechanics and Engineering,2013;32(Z1):2798—2805
9 王海礼,石崇,王盛年,等.随机散粒岩土材料自然堆积2D数值仿真分析.三峡大学学报(自然科学版),2013;35(5):73—77Wang Haili,Shi Chong,Wang Shengnian,et al.2D numerical simulation analysis of natural accumulation of stochastic particles geotechnical materials.J of China Three Gorges Univ(Natural Sciences),2013;35(5):73—77
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