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针对软岩遇水易崩解的特点,选取3组代表性岩样开展了浸水时间不同及多次干湿循环室内崩解试验,分析其崩解过程的颗粒级配变化情况,研究其耐崩解性指数变化规律;对比分析3组软岩崩解性强度,并结合岩矿鉴定结果,探讨软岩崩解强度与矿物组成的关系。结果表明,软岩崩解过程主要经过初崩、未完全崩解和完全崩解三个阶段,伴随块状、片状、颗粒状及泥状崩解形式;软岩类型不同,崩解性相应不同,粉砂质泥岩与细砂泥质粉砂岩表现强崩解,粉砂细砂岩屑砂岩表现弱崩解;强崩解软岩崩解物粒径小于0.25mm颗粒逐渐处于主导地位,弱崩解软岩崩解物粒径大于5mm颗粒一直处于主导地位;其矿物组成,尤其粘土矿物、微观结构中胶结物成分等内在因素决定软岩崩解性强弱。
In view of the characteristics of soft rock being easily disintegrated by water, three representative rock samples were selected to carry out different indoor immersion time and repeated indoor and outdoor disintegration test, and the change of particle size distribution during disintegration was analyzed. Solution index. The disintegration strength of soft rock in three groups was compared and analyzed, and the relationship between soft rock disintegration strength and mineral composition was discussed in combination with the results of rock and mineral identification. The results show that the main process of the soft rock disintegration is mainly through the three stages of initial collapse, incomplete disintegration and complete disintegration, with the disintegration of massive, flaky, granular and mud; the different type of soft rock, the corresponding disintegration In contrast, the silt mudstone and fine silt mudstone strongly disintegrate, the silt sandstone sandstone shows weak disintegration; the particles with strong disintegration of soft rock disintegration are gradually dominated by the particles with the diameter of less than 0.25mm, and the weak collapse The dissolution of soft rock disintegrated particles larger than 5mm particles has been in the dominant position; its mineral composition, especially clay minerals, cementitious materials in the microstructure and other internal factors determine the strength of soft rock disintegration.