多因素影响下石膏-石英砂类相似材料强度特性变化规律研究

以石膏-石英砂类相似材料为研究对象，采用室内实验分析了7种因素对该类相似材料强度指标的影响规律。结果表明，养护温度和材料密度与材料强度指标呈正相关，养护湿度、砂胶比、灰膏比、细粒级石英砂含量、含水量等与材料强度指标呈负相关。计算了不同影响因素的敏感度指标，其中材料强度对养护温度的敏感性仅4.5%，而对砂胶比的敏感性达到了104.9%。对于单轴抗压强度，温度、含水量、密度、湿度、灰膏比、细粒级石英砂含量和砂胶比的敏感度依次增大; 对于抗拉强度，砂胶比、灰膏比、密度、湿度、含水量、细粒级石英砂含量和温度的敏感度依次降低。

Influence of Multi-factor on Variation Rule of Strength Characteristics of Similar Rock Material Prepared with Gypsum and Quartz Sand

A kind of similar rock material was prepared with gypsum and quartz sand, and influence of seven factors on the strength index of the material was analyzed by performing laboratory tests. The results show that curing temperature and material density are in positive correlation with material strength index, while curing humidity, sand-to-binder ratio, ash-to-paste ratio, fine-grained quartz sand content, as well as water content are in negative correlation with material strength index. Based on the calculation of the sensitivity indices of different influencing factors, it is found that material strength has a sensitivity of only 4.5% to curing temperature, a sensitivity of 104.9% to sand-binder ratio. Factors of curing temperature, water content, material density, curing humidity, ash-to-paste ratio, fine-grained quartz sand content and sand-to-binder ratio are in an ascending order in terms of their sensitivity to uniaxial compressive strength; while factors of sand-to-binder ratio, ash-to-paste ratio, material density, curing humidity, water content, fine-grained quartz sand content and curing temperature are in a descending order in terms of their sensitivity to tensile strength.