空腔膨胀理论中混凝土材料模型的对比

Investigation of material models of concrete used in cavity expansion theory

基于三向应力空腔膨胀理论,对比研究了具有代表性的7种混凝土介质球形空腔膨胀模型。与三组试验数据的对比表明,混凝土材料本构可压缩性假设明显优于不可压缩性假设,而塑性锁应变假设与线性压力—体积应变假设差别不大,材料响应弹塑性假设与弹性—断裂—塑性假设差别不大。在合理的参数选择下,相对简单的模型可以获得令人满意的结果。

Based on the 3-dimensional stress cavity expansion model, 7 concrete material models used in SCET were investigated and compared with three series test data. Compressed model was demonstrated to be more advanced than the uncompressed model, and plastic locked hydrostats model to be little different from the liner pressure-volumetric strain model, and elastic-plastic model of concrete little different from the elastic-cracked-plastic model. With the proper parameters, the simple model can acquire a good result.