采矿与安全工程学报2017，Vol.34Issue(1)：155-162,8.DOI:10.13545/j.cnki.jmse.2017.01.024
高温对弱黏结中砂岩物理力学性质的影响
Effect of high temperature on the mechanical properties of the sandstone physical weak bond
摘要
Abstract
The relationship between the mechanical and physical parameters of weak bonding sand-stone and temperature and confining pressure was analyzed based on tests of the samples after high temperature (400-1000 ℃).The test results have shown that temperature has little effect on volume,mass and velocity of specimen after baking under 400 ℃;above 400 ℃ baking,volume expansion ra-tio and buming loss rate monotonically increase as the temperature rises;velocity monotonically de-creases as the temperature rises.The value of uniaxial compression deformation parameter after 400 ℃and 800 ℃ is obviously greater than that in natural state (25 ℃).Elastic modulus and deformation modulus decrease sharply after 1000 ℃,and ultimate strain increases monotonically as the temperature rises.Elastic modulus,deformation modulus,and peak strength of specimens are positively correlated to the confining pressure;a good linear relationship exists between peak strength and confining pressure,which accords with Coulomb strength criterion.High temperature has little effect on cohesion of speci mens when temperature is below 800 ℃;but cohesion decreases sharply when temperature exceeds 800 ℃.Internal friction angle of specimens is positively correlated to the temperature.High tempera-ture below 1000 ℃ has strengthening effect on weak bonding medium sandstone;and the effect will weaken when the temperature exceeds 800 ℃.Failure angles of Mohr-Coulomb theory are approxi-mately equivalent to test results,and negative correlation exists between the testing failure angles of the specimens and the confining pressure.关键词
岩石力学/高温/弱黏结/中砂岩/三轴压缩/物理力学参数Key words
rock mechanics/high temperature/weak bond/sandstone/three axial compression/physical and mechanical parameters分类
建筑与水利引用本文复制引用
马建宏,韦四江,苏承东..高温对弱黏结中砂岩物理力学性质的影响[J].采矿与安全工程学报,2017,34(1):155-162,8.基金项目
国家自然科学基金项目(U1204512,U1304517) （U1204512,U1304517）
河南省高等学校青年骨干教师资助计划项目(2010GGJS-058) （2010GGJS-058）
