非均匀土体受压破坏数值模拟

Numerical Simulation for Heterogeneous Soil Failure Process under Compression

根据土体颗粒大小的非均匀性 ,将颗粒之间的接触关系视为符合库仑条件 ,采用颗粒状离散元对恒速加载条件下土体的崩塌破坏过程及其力场、速度场的演化规律进行了模拟。结果表明 ,土体内因颗粒间分离而形成的宏观裂缝带是破坏坍塌的前兆 ,因此 ,在形成宏观裂缝区以前进行加固是保证土体稳定的基础 。

In this paper,according to the heterogeneous characters of soil grains,ball discrete element method is used to simulate the failure process of soil body,as well as force and velocity evolving pattern in it,under constant rate compression action.In the simulation,Coulomb-Mohr criterion is used for the contact between soil grains.The simulation results show that departures between grains and macro-cracks are the collapsing omens of the soil body,therefore,reinforcement should be done before the macro-cracks are formed,it is valuable for the reinforcement of rock and soil engineering.