中文摘要：

小粒的系统由增加收拾行李的部分简单地在点 J 经历堵塞转变。大规模平行分离元素代码(THDEM：清华分离元素方法) 被用来在点 J 附近获得对结构、机械的性质的令人满意的统计描述。100,000 polydispersed 的均衡说的压缩光滑的粒子在高效计算机上被模仿清楚地观察力量链的复杂配置。对关联功能，协作数字，收拾行李的部分的空间分发，和压力的第一座山峰被计算与增加收拾行李的部分分析他们的变化。在点 J 的批评收拾行李部分决心是 0.62。从点 J 的增长压力和协作数字与幂定律可伸缩很好，并且与以前的理论断言与一致。收拾行李的部分的分发是在平均价值附近的正常分布。标准差与增加收拾行李的部分减少，显示系统与一件更稠密的收拾行李是更一致的。

英文摘要：

Granular systems undergo a jamming transition at point J simply by increasing the packing fraction. A large-scale parallel discrete element code （THDEM： TsingHua Discrete Element Method） was used to obtain a satisfying statistical description of the structural and me- chanical properties near point J. The isostatic compressions of 100,000 polydispersed frictionless particles were simulated on high performance computers to clearly observe the sophisticated con- figurations of force chains. The first peak of the pair correlation function, coordination number, spatial distribution of the packing fraction, and stress were calculated to analyze their variations with increasing packing fraction. The critical packing fraction at point J is determined to be 0.62. The incremental stress and coordination number from point J scale well with the power law, and coincide with previous theoretical predications. The distribution of the packing frac- tion is a normal distribution around the average value. The standard deviation decreases with increasing packing fraction, indicating the system is more uniform with a denser packing.