岩土材料破损过程的细观数值模拟

MESOSCOPICAL NUMERICAL SIMULATION OF BREAKAGE PROCESSES OF GEOMATERIALS

探究岩土材料破损机制必须考虑其非均质性。岩土破损力学将岩土材料抽象成由胶结元和摩擦元组成的二元结构体,在细观尺度上分别把胶结元看成理想弹脆性的和把摩擦元看成理想弹塑性的材料,通过受荷过程中胶结元破损并逐渐向摩擦元转化来模拟岩土材料的破损过程,最后给出平面应变单轴受压应力状态下的数值算例。数值算例结果表明,基于岩土二元介质概念的细观有限元方法可较好地模拟岩土材料的破损过程和变形特性。

Geological materials are nonhomogeneous, which should be considered when breakage mechanism of geomaterials is investigated. Under the theoretical framework of breakage mechanics for geological materials, the geomaterials are conceptualized as binary medium consisting of bonded elements and frictional elements, which are idealized as elastic-brittle element and elastoplastic element respectively in the mesoscopical scale. During the loading process, the bonded element gradually fracturing and turning to be the frictional element can simulating the breakage process of geomaterials. Lastly the numerical tests of uniaxial compression under plane strain conditions are performed. The numerical examples show that the mesoscopical finite element method based on the binary-medium model for geomaterials can simulate properties of the geological materials. satisfactorily the breakage processes and deformational