【摘要】 为研究干湿循环作用下石膏岩劣化效应,并对其劣化损伤进行数学描述,采用颗粒流软件进行了细观力学模拟,并基于Weibull分布建立了统计损伤本构模型。研究表明:随着干湿循环次数的增加,试件裂纹数量不断增加,拉裂纹增加数量尤为显著;进行相同次数干湿循环时,随着围压不断增大,试件的拉裂纹数量逐渐减少,剪切裂纹数量不断增多。干湿循环作用对石膏岩细观强度参数影响效应大小不一,其强弱关系为:摩擦系数>抗拉强度>内摩擦角>节理模量>黏聚力。模型模拟值和试验值较为吻合,表明该模型能表征岩石破裂过程中的应力应变关系。更多还原

【Abstract】 In order to study the effect of deterioration under the condition of dry-wet cycle and describe the damage mathematically, this research conducted the microchemical simulation by granular-flow software. The statistical damage constitutive model is established based on the Weibull distribution. The results show that with the increase of the times of dry-wet cycles, the crack number of specimens increases continuously, especially the number of tensile cracks. In the same dry-wet cycle, the tensile crack decreases gradually while the shear crack increases with the increase of confining pressure. The effect of dry-wet cycle on the meso-strength parameters of gypsum varries in magnitude: friction coefficient>tensile strength>internal friction angle>joint modulus>cohesion. The simulation values are in comparative agreement with the experimental values. This proves that the stress-strain relationship in the gypsum failure process could be characterized by this model.更多还原