The Distinct Element Method(DEM)is a discontinuum-based numerical method especially applicable to solve the discontinuity problems in jointed rock mass.

离散元法是基于不性假设数值方法,它特别适合于求解节理岩体非性问题。

According to the problem of position discontinuity using GPS in city cars, a scheme that GPS is combined with DR which is composed by piezoelectric gyro and milemeter is put forward.

针对城市车辆全球定位系统(GPS)定位存在不性问题,提出了采用压电陀螺和里程仪低本航迹推算系统与GPS合方案。