摘要
高温热处理后岩石的物理力学性质的变化与其内部孔隙结构的改变有关。以高温水冷处理后的两种花岗岩为研究对象,进行了气体渗透试验,研究了其渗透性随温度的演化规律及微观孔隙结构的变化,并利用比表面积及孔径分析测试从微观层面分析了高温水冷处理后花岗岩的损伤演化和裂隙发育机理,为宏观物理性质改变提供了理论依据。结果表明,两种不同的花岗岩在受到高温水冷后表现出相同的规律,随着温度的升高,岩石内部逐渐产生温度裂隙,比表面积增大、总孔体积增大。利用比表面积及孔径分析得到了岩石内部纳米级孔隙的分布情况,发现在温度的作用下岩石内部的介孔受温度的影响最大。可见,在高温热处理后花岗岩内部的温度裂隙是影响岩石物理性质的主要因素之一,同时利用比表面积及孔径分析测试可以得到花岗岩内部的纳米级孔隙分布情况,为花岗岩的微观孔隙结构研究提供了技术支持。
The variation of physical and mechanical properties of rock after heat treatment is related to the variation of internal pore structure.Two types of granites with different composition were heated and quenched in water,and tested on gas permeability to understand the evolution of permeability and changes in micro-pore structure.The specific surface area and pore size were analyzed and the damage and the crack development of granite at microscopic level were observed,which provides a theoretical basis at a macroscopic level.Results show that the two types of granites displayed the same rules after the treatment.As the temperature increased,cracks occurred gradually inside the rock,and specific surface area and total pore volume increased.In addition,the distribution of nano-pores in the rock was perceived based on specific surface area and pore size.The meso-pores were most affected by temperature,and the thermal cracks were the main factor affecting the physical properties of the rocks.Therefore,specific surface area and pore size analysis tests can be used to obtain the nano-scale pore distribution in the granite,which provides a technical support for the study of the micropore structure of granite.
作者
张宇皓
段志波
张帆
ZHANG Yu-hao;DUAN Zhi-bo;ZHANG Fan(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China;School of Polytech Lille,University of Lille,Villeneuve-d’ASCQ 59655,France)
出处
《科学技术与工程》
北大核心
2021年第1期297-302,共6页
Science Technology and Engineering
基金
国家自然科学基金(51579093)。
关键词
高温水冷
孔径分析
花岗岩
气体渗透率
heating and water cooling treatment
pore size analysis
granite
gas permeability
