水泥石膏胶结相似材料在固-流耦合试验中的适用性  

Applicability of similar materials bonded by cement and plaster in solid-liquid coupling tests

作　　者：史小萌[1] 刘保国[1] 亓轶 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《岩土力学》2015年第9期2624-2630,2638,共8页Rock and Soil Mechanics

基　　金：国家科技支撑计划资助(No.2013BAB10B06);中央高校基本科研业务费专项资金资助(No.2013YJS064)

摘　　要：通过不同配比下相似材料试件的水理性质正交试验,分析了以水泥和石膏作为胶结剂,石英砂作为骨料的相似材料吸水率、软化系数和渗透系数随砂胶比(骨料与胶结材料质量比)、水膏比(水泥占胶结材料百分比)、石英砂粒径的变化规律。通过对比分析,证明此种相似材料在一定配比情况下遇水不会发生崩解,而是产生类似岩石的软化现象,适用于原型岩体为孔隙较发育的石灰岩和砂岩,并且不以吸水特性为研究对象的相似材料固-流耦合模型试验研究。通过对样本数据进行多元回归分析,得到了吸水率、软化系数和渗透系数与砂胶比、水膏比和石英砂粒径之间的经验方程。通过神华新街台格庙矿区白垩系志丹群巨厚层砂岩含水层固-流耦合相似材料模型试验,证明水泥石膏胶结相似材料可以应用于固-流耦合试验中,并且经验方程可用于对相似材料的水理性质进行验算。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.

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 

分 类 号：TU411[建筑科学—岩土工程]