【摘要】 利用扩展有限元法对裂隙水压作用下混凝土结构的开裂过程进行了模拟,裂纹中的流体运动在立方定理的基础上求解,混凝土开裂力学行为采用了黏聚裂纹模型来描述,采用松散型的耦合方式考虑裂隙水流和开裂结构间的相互作用。推导了在基于虚节点法的扩展有限元法框架下的耦合模型控制方程,通过双层迭代结构进行总体方程求解,对混凝土试件在裂纹水压作用下的开裂过程进行了数值模拟。不同加载速率条件下的计算结果反映的裂纹水压变化规律均与试验相近,结果也说明了扩展有限元法是处理连续-非连续问题的一种有效方法。更多还原

【Abstract】 The fracture process of concrete under the action of water pressure in fissure is studied utilizing the extended finite element method(XFEM).The movement of water is described by cubic Law and the cohesive crack model is used to describe the mechanic behavior of cracking.The governing equations of the fluid-solid coupling model are developed in the frame of XFEM.Loose coupling approach and the dual-iteration structure are adopted in the formulation.The proposed method is applied to simulate the fracture process of concrete specimens under the action of water pressure.Acceptable agreement between the numerical and experimental results is achieved.The numerical application shows XFEM is suitable for treating the problems of continuities-discontinuities.更多还原