论文部分内容阅读
膨胀岩是一种特殊软岩,在干湿循环作用下容易崩解泥化。针对延吉膨胀岩,开展干湿循环作用下膨胀岩浸水崩解试验,研究其粒径变化规律。根据干湿循环后粒径分布,引入标准基础熵表征膨胀岩崩解特性,并与崩解比进行类比分析。研究结果表明:各粒组含量在前3次干湿循环中变化较大,第3次干湿循环后逐渐趋于稳定;随着干湿循环次数的增加,粗颗粒含量逐渐减少,细颗粒含量增加,土颗粒大小经历了由均匀到不均匀,再到均匀的过程;标准基础熵与崩解比存在明显的线性负相关关系,标准基础熵随着崩解比的增大而减小,表明利用标准基础熵表征颗粒分布规律是合理可行的;随着干循环次数的增加,标准基础熵先减小,后逐渐稳定,与级配曲线及其衍生指标变化规律相同,再次验证该方法的可行性和适用性,为膨胀岩的崩解破碎分析提供一种新的量化指标;膨胀岩路堑边坡开挖以后,应及时采取防水保湿措施,防止发生崩解泥化现象。
Expansive rock is a kind of special soft rock, which is easy to collapse and muddy under the action of the wet and dry cycle. According to the Yanji expansive rock, the disintegration test of infiltration rock infiltration under wet-dry cycle was carried out, and the variation of particle size was studied. According to the particle size distribution after the wet-dry cycle, the standard basic entropy is introduced to characterize the disintegration characteristics of the expansive rock, and an analogy analysis is made with the disintegration ratio. The results show that the content of each granule varies greatly in the first three wet-dry cycles and gradually becomes stable after the third dry-wet cycle. With the increase of the number of wet-dry cycles, the content of coarse granules gradually decreases and the content of fine granules Increase, the soil particle size from uniform to uneven, and then to the uniform process; standard basic entropy and disintegration ratio significant linear negative correlation, the standard basic entropy decreases with the disintegration ratio increases, indicating It is reasonable and feasible to characterize the law of particle distribution using the standard basic entropy. With the increase of the number of dry cycles, the standard basic entropy decreases first and then becomes stable gradually, which is the same as that of the gradation curve and its derivative index. It provides a new quantitative index for the disintegration and fragmentation analysis of expansive rock. After the excavation of the expansive rock cutting slope, waterproof and moisturizing measures should be taken in time to prevent disintegration and mud formation.