关键词: 相似材料, 固流耦合, 水理性质, 正交设计方法, 回归分析

Abstract: The hydro-physical orthogonal tests are conducted on the similar materials (with cement and plaster as binding agents and sand as aggregate) at different similarity ratios. The relationships among the water-absorption, softening coefficient, permeability coefficient and sand-binder ratio, cement-plaster ratio and grain-size variation are developed. Contrastive analysis demonstrates that the similar material fails to disintegrate at certain proportion ratios when it meets water, but shows behavior similar to rock softening. This material can be used in the solid-liquid coupling tests without water absorption as a surrogate material of limestone or sandstone whose pore is well developed. By the multivariate regression analysis of the sample data, empirical relationships are developed among the water-absorption, softening coefficient, permeability coefficient and the sand-binder ratio, cement-plaster ratio and grain-size. Using the similar material, the solid-liquid coupling tests are performed on the sandstone aquifer with a large thickness of Zhidan Group of Cretaceous at Taigemiao mining in Shenhua New Street, showing that the surrogate material made of cement, plaster and sand can be used in solid-liquid coupling tests, and the proposed empirical equations can be used to check calculation results of the hydro-physical parameters of similar materials.

Key words: similar material, solid-liquid coupling, water-physical property, orthogonal design method, regression analysis