CAJ | 학술논문

从辽宁锦州拟建地下储库工程现场钻取典型花岗岩岩芯,进行不同冻结温度(-10 ℃～-50 ℃)和不同含水状态(干燥和饱和)的单轴及三轴压缩试验,分析岩石的变形破坏规律、干燥和饱和状态抗压强度以及三轴剪切强度参数c,( 值随温度的变化关系.试验结果表明:(1) 无论干燥还是饱和试样,微风化花岗岩单轴及三轴抗压强度随着低温温度的降低而提高,但呈现非线性增加的趋势,得到花岗岩抗压强度随低温温度变化的非线性关系拟合式,并认为微风化花岗岩存在一个抗压强度趋于稳定的温度界限值,此值约为-40 ℃;(2) 微风化花岗岩在干燥和饱和条件下,黏聚力c值随温度的降低而增大,在干燥条件下尤为明显.干燥条件下,微风化花岗岩内摩擦角随低温温度降低变化较小,摩擦角基本保持在57°左右,饱和条件下,微风化花岗岩内摩擦角随温度降低而增加, 由-10 ℃～-50 ℃增长幅度约为3.43%.该研究成果可为液化天然气(LNG)的低温地下存储提供一定的力学参数依据.
종료녕금주의건지하저고공정현장찬취전형화강암암심,진행불동동결온도(-10 ℃～-50 ℃)화불동함수상태(간조화포화)적단축급삼축압축시험,분석암석적변형파배규률、간조화포화상태항압강도이급삼축전절강도삼수c,( 치수온도적변화관계.시험결과표명:(1) 무론간조환시포화시양,미풍화화강암단축급삼축항압강도수착저온온도적강저이제고,단정현비선성증가적추세,득도화강암항압강도수저온온도변화적비선성관계의합식,병인위미풍화화강암존재일개항압강도추우은정적온도계한치,차치약위-40 ℃;(2) 미풍화화강암재간조화포화조건하,점취력c치수온도적강저이증대,재간조조건하우위명현.간조조건하,미풍화화강암내마찰각수저온온도강저변화교소,마찰각기본보지재57°좌우,포화조건하,미풍화화강암내마찰각수온도강저이증가, 유-10 ℃～-50 ℃증장폭도약위3.43%.해연구성과가위액화천연기(LNG)적저온지하존저제공일정적역학삼수의거.
The granite samples were drilled form a proposed underground gas storage site in Jinzhou,Liaoning Province. The mechanical tests(uniaxial and triaxial) were conducted under different freezing temperatures(-10 ℃--50 ℃) and different moisture conditions(fully saturated and dry). Then the law of rock deformation,compressive strength of samples,and the relation between the shear strength parameters and the freezing temperatures were analyzed. The test results show as follows:(1) Whether the granite samples are dry or fully saturated,the uniaxial and triaxial compressive strength increased nonlinearly with the decrease of temperature. There is a threshold temperature below which the strength of granite becomes to stabilize. The effect of the low temperature on the mechanical properties is more obvious for saturated samples. (2) The cohesion increased significantly with the decrease of low temperature. For dry samples,the internal friction angle remained at about 57°. The internal friction angle of fully saturated samples increased about 3.43% when the temperature dropped from -10 ℃ to -50 ℃. In the freezing conditions,the moisture condition has an important impact on the change of the shear strength parameters. The results provide helpful insights for the construction of liquefied natural gas (LNG) storage at low temperature.