【摘要】 为制备具有力学性质递变特征的相似材料试样,本文通过水泥石膏相似材料的配比试验,得到了两种骨料(标准砂和河沙)相似材料力学性质与配比间的关系。在拟合河沙相似材料的室内力学测试数据的基础上,得到了配比值关于抗压强度和弹性模量的确定公式。试验表明:用水量、成型压力和平均骨料粒径对相似材料的力学性质均有不同程度的影响,在制样过程中需要加以控制;低强度相似材料的抗拉强度不易控制,而单轴抗压强度和弹性模量对配比的变化有明显响应;河沙相似材料的力学性质与配比间呈明显的线性关系,而标准砂相似材料存在临界骨料含量和临界水泥含量表现出明显的非线性特征;在调整配比所能实现的抗压强度和弹性模量的变化范围内,相似材料能够较好地模拟单轴抗压强度大于3MPa的风化岩。更多还原

【Abstract】 This paper is to prepare the similar material specimens with gradual variation of mechanical properties.The proportion tests is used to achieve the relationship between mechanical properties and proportion of cementgypsum similar materials with different aggregates. A defined formula of proportion based on compressive strength and elastic modulus is determined via fitting the laboratory mechanical testing data of river-sand material. The test result shows that: water dosage,forming pressure and average particle diameter have effect of different levels and should be controlled in specimen preparation process. The tensile strength of low-intensity similar material is uncontrollable while the compressive strength and the elastic modulus show an obvious response to the change of proportion. For river sand similar material, the mechanical properties and the proportion present a linear relationship. While the standard sand similar material presents a nonlinear relationship between the mechanical properties and the proportion due to the critical content of cement and aggregate. The variable ranges of compressive strength and elastic modulus are 0 ~ 17. 5MPa and 0. 3 ~ 2. 02 GPa,respectively. The weathered rock can besimulated well using similar material in this range.更多还原