多孔含水岩层的相似材料配比研究  

A method for determining the ratio of similar material to simulate porous water-bearing stratum

作　　者：刘金辉 李文枭 刘宇森 刘保国[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中冶建筑研究总院有限公司,北京100088

出　　处：《岩土力学》2018年第2期657-664,共8页Rock and Soil Mechanics

基　　金：国家科技支撑计划资助(No.2013BAB10B06);北京市级大学生科学研究与创业行动计划资助项目(No.150130017)~~

摘　　要：以石膏、浮石、硅藻土等材料为相似材料对多孔含水岩层进行相似材料模拟。试验中采用四因素(硅藻土水泥石膏比、标准砂浮石比、骨胶比、重晶石骨料比)、五水平的正交试验方法,分别对多孔含水岩层的相似材料试件进行密度、单轴抗压强度、孔隙率、弹性模量以及软化系数的测定,得出相应的物理力学性质指标,采用直观分析法分析各因素对物理力学性质的影响规律。分析结果表明:由于各配比度不同,相似材料强度分布范围较广,在与多孔岩层的岩石参数对比中发现,在一定的相似条件下,基本符合多孔岩层岩石的相似要求;硅藻土含量与密度、抗压强度、弹性模量、孔隙率呈负相关,与软化系数呈正相关;浮石含量与密度、抗压强度、弹性模量、软化系数呈负相关,与孔隙率呈正相关。所加入的两种材料可较好地模拟样品的多孔特性。在允许波动范围之内,所建立的模拟多孔含水岩层的经验方程可用于工程实践。In this paper, materials such as plaster, pumice and diatomite are used to simulate water-bearing porous rock as similar material specimen. The experiment adopts four-factor （cement/plaster/diatomite ratio, the standard ratio of pumice sand, bone-glue ratio and barite powder ratio）, five-level orthogonal experimental design to measure the density, uniaxial compressive strength, porosity, elastic modulus and softening factor. The measurements are conducted to determine whether the simulation materials can be used to simulate water-bearing rocks. With the use of direct analysis method, we determine how various factors affect physical and mechanical nature of the specimens. Analysis results show that： Due to different material ratios, the strength of the specimens is widely distributed. Comparing with the parameters of the porous layer, under certain similar conditions, we find that the specimens are with similar properties to the porous layer rock. Diatomite ratio is negatively correlated with density, compressive strength, elastic modulus and porosity, and it is positively correlated with softening coefficient. Pumice ratio is negatively correlated with density, compressive strength, elastic modulus and softening coefficient, and it is positively correlated with porosity. Therefore, addition of the two materials can simulate the porous nature of the rock sample well. Within the allowable range, the established empirical equation to simulate porous water-bearing rocks can be used in engineering practice.

关 键 词：相似材料 多孔含水岩层 正交试验设计方法 回归分析 经验公式 

分 类 号：TU53[建筑科学—建筑技术科学]