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 relationship . As the mass of samples increases, the disintegration rate increases significantly within the first 50% of the disintegration time.

TU443

西北民族大学引进人才科研项目（Z2302818）；甘肃省青年科技基金计划（22JR5RA089）；甘肃省2023年研究生“创新之星”项目（2023CXZX-205）