多因素耦合作用下砒砂岩冻胀性能试验

Experimental research on the freeze capacity of pisha sandstone under the multifactors

为研究含水率、温度、干密度与砒砂岩冻胀率的关系,针对内蒙古鄂尔多斯市准格尔旗砒砂岩进行不同含水率、不同温度、不同干密度下多因素耦合冻胀试验.研究结果表明：砒砂岩含水率在11%以下时,几乎不发生冻胀;含水率为12%-16%时,冻胀率随含水率增加呈线性增大;冻胀率随干密度的增大而增大,当冷端温度达到-20℃时,表现异常;冻胀率随冷端温度的降低而增大,但干密度为1.85 g/cm3的试件,冻胀率随冷端温度的降低冻胀率有减小态势.运用spss软件对试验数据进行多元非线性回归,确定了含水率、干密度、冷端温度多因素耦合作用下冻胀率的回归方程.

In order to study the relationship between freeze capacity of pisha sandstone and its moisture rate,temperature,and dry density as well,this paper focuses on the multi-factor experiment on different moisture,temperature,and dry density at Zhungeer Banner,Erdos City,Inner Mongolia Autonomous Region. According to the study,it will almost not be frozen,when the moisture rate is below 11%. When it comes between 12% to 16%,the moisture rate will be changed. The freeze rate is increased with the increase of the dry density. It will be performed exceptionally,when the temperature is below-20 centi-degree. The freeze rate is increased with the decrease of the temperature of its cold end portion. However,as for the materials which own 1. 85 g/cm3 dry density,the freeze rate is in decreasing state with the decrease of the temperature of its cold end portion. By SPSS software on the study of its data with multi-non-linear regression,the regression equations of freeze rate is confirmed under multi-factor among the moisture rate,dry density,and temperature.