摘要
采用热膨胀力测试系统和孔隙测定装置研究了不同温度条件下砂岩和石灰岩的热膨胀力和孔隙率的变化规律.结果表明,2种岩石的温态热膨胀力变化过程基本相同,随着加热时间延长温态热膨胀力增大,最后趋于恒定;岩性对岩石温态热膨胀力有显著影响,在相同温度水平砂岩温态热膨胀力大于石灰岩,其最大值相差可达9倍;砂岩温态热膨胀力对温度的响应较慢,石灰岩对温态热膨胀力的响应较快,使砂岩恒温阶段的温态热膨胀力与升温结束时的膨胀力之比远大于石灰岩;岩石孔隙率随温度升高而增大的变化规律与温态热膨胀力的变化规律基本一致,但岩石孔隙率快速增大的起始温度比热膨胀力急剧增大的起始温度低,可能是岩石经较低温度作用后的冷却过程中残余应力导致岩石内部裂隙增加所致.
The change laws of heat swelling power and porosity of sandstone and limestone were researched at different temperatures using a heat swelling power experimental system and a porosity test apparatus. The results show that the swelling power of rocks increases with the heating time, and finally tends to its maximum. At the same heating temperature the swelling power of sandstone is larger than that of limestone and the largest swelling power of sandstone is nine times more than that of limestone. Because the change speed of sandstone swelling power in response to temperature is slower than that of limestone, the ratio of heat swelling power of sandstone at the end of constant temperature to at the end of temperature rise is larger than that of limestone. The variousness law of porosity with the temperature is almost as same as that of the swelling power. The starting temperature of porosity increasing rapidly is lower than that of swelling power increasing promptly.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2008年第5期670-674,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50574037)
关键词
热膨胀力
砂岩
石灰岩
heat swelling power
sandstone
limestone
作者简介
谌伦建（1959-），男，四川省射洪县人，教授，博士生导师，博士，从事矿山岩石力学和矿产资源利用方面的研究．E-mail：lunjianc@hpu．edu．cn Tel：0391-3987232
