为了研究多分散颗粒体的接触力分布规律,预估颗粒体中颗粒破碎的分布范围,采用颗粒流离散元法(discrete element method,DEM)构建不同颗粒级配(分散度)的颗粒体,对土体的三轴压缩试验进行模拟,以研究颗粒粒径对颗粒体接触力分布的影响...为了研究多分散颗粒体的接触力分布规律,预估颗粒体中颗粒破碎的分布范围,采用颗粒流离散元法(discrete element method,DEM)构建不同颗粒级配(分散度)的颗粒体,对土体的三轴压缩试验进行模拟,以研究颗粒粒径对颗粒体接触力分布的影响。通过分析不同颗粒级配试样中法向接触力的概率密度分布和累积分布,对比不同颗粒级配试样中具有相同粒径的子颗粒集的配位数分布和最大接触力,调查了颗粒级配对密实颗粒体接触力分布特性的影响。结果表明:试样中粒径较大的颗粒相比于小粒径颗粒,试样中粒径较大的颗粒会承受更大的接触力;粒径较小的子颗粒集相比于粒径较大的颗粒体具有较小的最大接触力和配位数;细颗粒倾向于分布在大颗粒包围的孔隙中,此时,细颗粒基本上不参与传递接触力;颗粒级配越好,颗粒粒径对接触力分布的影响越小。展开更多
In 1585,a MS5 3/4 earthquake occurred in the south of Chaoxian county,Anhui Province. The parameters of this earthquake were reported differently in various versions of earthquake catalogues. According to detailed tex...In 1585,a MS5 3/4 earthquake occurred in the south of Chaoxian county,Anhui Province. The parameters of this earthquake were reported differently in various versions of earthquake catalogues. According to detailed textual research on the historic records of this earthquake,the epicenter location of the earthquake was further confirmed by means of seismo-geological field investigations in the Chaohu-Tongling region along the western Yangtze River valleys. Shallow seismic prospecting and drilling methods were applied in studying the buried fault. The possibility of the existence of seismogenic faults and fault activity in the western Yangtze River area were analyzed in depth,and the causative tectonic background of the 1585 MS5 3/4 south Chaoxian earthquake was studied. The results of this study indicate that the Yanjiaqiao-Fengshahu fault,which was active in the early to mid-Pleistocene,is possibly the causative structure of this earthquake. To identifying the seismogenic structure of the 1585 south Chaoxian earthquake will help gain more knowledge about the tectonic background of moderate and small earthquake activity in Eastern China.展开更多
The Tancheng-Lujiang fault zone has great influence in eastern China. Studies have shown obvious signs of neotectonic activities on the Xinyi-Wuhe segment of the Tancheng-Lujiang fault zone. In this study,on the basis...The Tancheng-Lujiang fault zone has great influence in eastern China. Studies have shown obvious signs of neotectonic activities on the Xinyi-Wuhe segment of the Tancheng-Lujiang fault zone. In this study,on the basis of the previous work,many seismological surveys are made along the Tancheng-Lujiang fault zone and trenches are excavated in key sites.Combined with the analysis of the seismic activities along the fault,the fault movement features and future seismic risk are discussed. Much first-hand information obtained in the paper can provide an important reference value for the study of large earthquake recurrence rules and the mid and long-term earthquake prediction on the Xinyi-Wuhe segment of the Tancheng-Lujiang fault zone.展开更多
文摘为了研究多分散颗粒体的接触力分布规律,预估颗粒体中颗粒破碎的分布范围,采用颗粒流离散元法(discrete element method,DEM)构建不同颗粒级配(分散度)的颗粒体,对土体的三轴压缩试验进行模拟,以研究颗粒粒径对颗粒体接触力分布的影响。通过分析不同颗粒级配试样中法向接触力的概率密度分布和累积分布,对比不同颗粒级配试样中具有相同粒径的子颗粒集的配位数分布和最大接触力,调查了颗粒级配对密实颗粒体接触力分布特性的影响。结果表明:试样中粒径较大的颗粒相比于小粒径颗粒,试样中粒径较大的颗粒会承受更大的接触力;粒径较小的子颗粒集相比于粒径较大的颗粒体具有较小的最大接触力和配位数;细颗粒倾向于分布在大颗粒包围的孔隙中,此时,细颗粒基本上不参与传递接触力;颗粒级配越好,颗粒粒径对接触力分布的影响越小。
基金sponsored by key earthquake science research fund programs of Anhui Province (Grant No. 200603)
文摘In 1585,a MS5 3/4 earthquake occurred in the south of Chaoxian county,Anhui Province. The parameters of this earthquake were reported differently in various versions of earthquake catalogues. According to detailed textual research on the historic records of this earthquake,the epicenter location of the earthquake was further confirmed by means of seismo-geological field investigations in the Chaohu-Tongling region along the western Yangtze River valleys. Shallow seismic prospecting and drilling methods were applied in studying the buried fault. The possibility of the existence of seismogenic faults and fault activity in the western Yangtze River area were analyzed in depth,and the causative tectonic background of the 1585 MS5 3/4 south Chaoxian earthquake was studied. The results of this study indicate that the Yanjiaqiao-Fengshahu fault,which was active in the early to mid-Pleistocene,is possibly the causative structure of this earthquake. To identifying the seismogenic structure of the 1585 south Chaoxian earthquake will help gain more knowledge about the tectonic background of moderate and small earthquake activity in Eastern China.
基金jointly sponsored by the Special Fund for Earthquake-related Scientific Research of China Earthquake Administration(201308012)the Anhui Provincial Natural Science Foundation(10040606Q24),China
文摘The Tancheng-Lujiang fault zone has great influence in eastern China. Studies have shown obvious signs of neotectonic activities on the Xinyi-Wuhe segment of the Tancheng-Lujiang fault zone. In this study,on the basis of the previous work,many seismological surveys are made along the Tancheng-Lujiang fault zone and trenches are excavated in key sites.Combined with the analysis of the seismic activities along the fault,the fault movement features and future seismic risk are discussed. Much first-hand information obtained in the paper can provide an important reference value for the study of large earthquake recurrence rules and the mid and long-term earthquake prediction on the Xinyi-Wuhe segment of the Tancheng-Lujiang fault zone.
