西北地区红层泥岩崩解特性试验研究

Experimental study on disintegration characteristics of red-bed mudstone in northwestern China

针对西北地区红层泥岩设计了一套自由浸水崩解装置,对不同质量的红层泥岩试块进行自由浸水试验。考虑试块的吸水过程,将试块吸水率作为崩解试验结果的补偿,研究不同质量红层泥岩试块的崩解率、崩解速率随时间变化规律。结果表明,测试红层泥岩膨胀性矿物含量较少,其崩解的前30%时间内崩解率可达45%~75%,前50%时间内崩解率可达68%~90%,崩解总时间T与试块质量m满足T=a*(1-e^(-b*m)) 关系。随着试块质量增加,试块崩解速率越大,且崩解的前50%时间内崩解率增加显著。

With regard to red-bed mudstone in northwestern China,a self-designed free immersion disintegration device is used to conduct free water immersion tests on red-bed mudstone samples with different masses.The water absorption process of the samples is considered in the tests,and the water absorption rate of the samples is used as a compensation for the disintegration test results.The disintegration rate and disintegration speed of red-bed mudstone samples with different masses over time are studied in this paper.The results show that the red-bed mudstone has a low content of expansive minerals,with a disintegration rate of 45%to 75%within the first 30%of the disintegration time,and 68%to 90%within the first 50%of the disintegration time.The total disintegration time T and mass of sample m follow the functional relationshipT=a*(1-e^(-b*m)) .As the mass of samples increases,the disintegration rate increases significantly within the first 50%of the disintegration time.