Sensitivity Analysis of Influencing Factors for Similar Material Based on Orthogonal Test Design

With sand and wood flour as the aggregate, gypsum and talcum powder as the cementing agent, aggregate-cementing agent ratio, plaster content and wood flour content are the major factors influencing the physical and mechanical properties of similar material. Based on orthogonal test design, twenty five schemes of similar material have been designed, and the unit weight, the uniaxial compression strength and the tensile strength of similar material were obtained. In this paper, the extreme difference analysis has been conducted covering the sensitivity of all factors, and the influencing law has been carried out of the factors on similar material. The research results show: aggregate-cementing agent ratio and plaster content are in direct proportion with the unit weight, uniaxial compression strength and tensile strength of similar material, while wood flour content is in inverse proportion, with varying influencing degree. For the unit weight of similar material, wood flour content is the major control factor and has the larger effect than the other two; while for the uniaxial compression strength and the tensile strength, aggregate-cementing agent ratio has more control than plaster content and wood flour content. The empirical formula of the similar material proportioning has been obtained by multi-variable linear regression analysis.