干湿循环作用烧变岩孔隙特征与演化机理  

Pore Characteristics and Evolution Mechanism of Burnt Rock under Dry-wet Cycle

作　　者：赵飞 胡鑫[2] 韩璐 关继超 李国勇 ZHAO Fei;HU Xin;HAN Lu;GUAN Jichao;LI Guoyong(Xuzhou Datun Engineering and Consulting Co.,Ltd.,Xuzhou 221611,China;College of Geology and Environment,Xi’an University of Science and Technology,Xi’an 710054,China;School of Mines,China University of Mining and Technology,Xuzhou 210008,China)

机构地区：[1]徐州大屯工程咨询有限公司,江苏徐州221611 [2]西安科技大学地质与环境学院,西安710054 [3]中国矿业大学矿业工程学院,江苏徐州210008

出　　处：《山西煤炭》2025年第1期115-120,共6页Shanxi Coal

摘　　要：烧变岩的孔隙特征对注充填浆液的扩散距离与浆液水与水泥比例较大影响,通过吸水率测定、低场核磁共振技术等方法对烧变岩物理性质与孔隙结构进行了研究。结果表明,砂岩吸水率从1.4432%~7.2695%,泥岩吸水率为9.2290%~10.8180%;测试样品的T2图谱的波形基本不变,前峰降低后峰升高,整体向右移动;干湿循环的影响导致烧变岩的孔隙结构发生变化,虽然波形高低起伏,但峰型保持基本稳定,在前峰降低的同时,后峰上升。在循环过程中,微孔逐步演变为中孔,中孔又逐渐转化为大孔,导致微孔的比例逐步减少,而大孔的比例则持续上升,泥岩W-6、W-7的初始大孔比例为29%、38%;分别增加到48%与53%,变化最大;泥岩经过烧变后物性特征发生了显著变化,有利于介质流动与注浆充填。研究表明岩性与距离火焰远近是控制孔隙变化的主要因素。The pore characteristics of burnt rock greatly influence the diffusion distance and the water-cement ratio of grouting slurry.The physical properties and pore structure of burnt rock were studied by water absorption determination and low-field nuclear magnetic resonance technology.Results showed that the water absorption rates of sandstone ranged from 1.4432%to 7.2695%,and the water absorption rates of mudstone ranged from 9.2290%to 10.8180%.The T2 spectrum waveform of the test samples remained fundamentally unchanged,with the front peak decreasing and the rear peak increasing,showing an overall rightward shift.The dry-wet cycle led to changes in the pore structure of the burnt rocks.Although the waveform fluctuated,the peak remained relatively stable.As the front peak decreased,the rear peaks increased.During the cycling process,micropores gradually evolved into mesopores,and mesopores gradually transformed into macropores,leading to a gradual decrease in the percentage of micropores and a continuous increase in the percentage of macropores.The initial percentage of macropores in mudstone W-6 and W-7 was 29%and 38%,which increased to 48%and 53%,respectively,showing the most significant changes.The physical properties of mudstone changed significantly after burning,facilitating medium flow and grouting filling.The results showed that lithology and distance from the flame were the primary factors of the pore structure changes.

关 键 词：烧变岩 干湿循环 孔隙结构 孔隙类型 

分 类 号：P642.5[天文地球—工程地质学]