混凝土三轴压缩试验及强度研究

Triaxial compression tests of concrete and yielding strength studies

为了研究混凝土在压力作用下的强度屈服情况,利用MTS对圆柱形混凝土试件进行三轴压缩试验,在四种不同围压情况下测得应力峰值和以及对应的塑性的体积变形情况。采用Mises-DruckerPrager准则描述孔隙压实区混凝土材料的屈服行为,同时引入材料在拉伸状态下的线性屈服面,得出了材料的屈服准则。利用不同形式的屈服准则形式(分段式、幂次型、指数型)对屈服准则拟合,并给出相应的拟合参数,并与线性的屈服线做以对比。

For studying the strength yielding conditions of concrete under pressures, the concrete samples with cylindrical geometrical shape are tested under triaxial compression by the use of MTS equipments. Under four different confi ning pressures the peak stresses and its corresponding volume deformations are measured and recorded. The yielding behaviors of pore compaction scopes are described by the Mises-Drucker-Prager criterion. Combined with the stretch conditions the yielding strength criterion is brought out. Different kinds of yielding criterions including: sectional function type, power function type, exponential function are fi tted and the fi tting parameters are given. The curves for above three types of yielding functions are compared with the linear function.