采矿与安全工程学报2017，Vol.34Issue(1)：121-126,6.DOI:10.13545/j.cnki.jmse.2017.01.019
高温砂岩热膨胀系数变化规律试验研究
Experimental study on thermal expansion coefficient changing rule of sandstone under high temperature
摘要
Abstract
Thermal cracking has become one of the main threats for underground geotechnical engi-neering under high temperature.With sandstone of underground coal gasification as a research object,thermal expansion coefficient changing rule of sandstone in the process of temperature-rise period and heat-preservation-period is systematically studied through experimental study.The research has shown that in the temperature-rise period,thermal expansion coefficient changes with the heating time in the way of inverse curve,and the curve can be divided into four stages:in the early stage,the curve is con-cave;in the second stage,the curve rises in an oblique line and thermal expansion coefficient rate be-comes stable;in the third stage,the curve is convex;in the final stage,the growth rate of thermal expan-sion coefficient declines,and the curve becomes smooth.In the process of thermal insulation,thermal expansion coefficient of sandstone increases gradually,but when the temperature reaches 700℃,growth trend of thermal expansion coefficient slows down apparently and becomes stable,and the change rate of the axial height of the sample decreases.关键词
高温/砂岩/热膨胀系数/试验Key words
high temperature/sandstone/thermal expansion coefficient/experiment分类
矿业与冶金引用本文复制引用
马占国,唐芙蓉,戚福周,史晓东,项亨,连永权..高温砂岩热膨胀系数变化规律试验研究[J].采矿与安全工程学报,2017,34(1):121-126,6.基金项目
国家自然科学基金项目(51323004,51674250,51204159) （51323004,51674250,51204159）
江苏省“六大人才高峰”高层次人才计划项目 （）
深部岩土力学与地下工程国家重点实验室专项基金项目 （）
