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不同矿物组成的软岩崩解特征及其差异性分析 被引量:4

Experimental Study on Slaking Characteristics of Soft Rock Composed of Different Minerals
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摘要 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。 According to the characteristics of soft rock easily disintegrating with water,three representative rock samples are chosen to perform laboratory tests of slaking in different soaking times and many dry wet cycles.The changes of grain contents of rock samples in slaking process are analyzed and the changes of the slake durability index are studied.Three groups of soft rock slaking of strength is comparative analysis.Combined with the results of rock and mineral identification,the relationship between strength and slaking of soft rock mineral composition is discussed.The results show that the soft rock disintegration process mainly has three stages:the initial disintegration,not completely disintegration and disintegration;the corresponding to different phases,block disintegration,sheet disintegration,granular disintegration and sludge disintegration forms can be seen;the type of soft rock is corresponding to different slaking;silty mud stone and fine sand mud silt stone appear strong slaking while silt and fine sand lithic sand stone appear weak slaking;slaking substances less than 0.25 mm were gradually dominated in strong slaking soft rock;slaking substances greater than5 mm have been in a dominant position in weak slaking rock;its mineral composition,especially clay minerals,cement composition of microstructure and other interior factors are the decisive factors in slaking characteristics.
出处 《水电能源科学》 北大核心 2016年第12期141-144,共4页 Water Resources and Power
基金 国家自然科学基金项目(51379106)
关键词 软岩 崩解性 耐崩解性指数 矿物组成 微观结构 soft rock slaking characteristics slake durability index mineral composition microstructure
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