摘要
为研究建腔周期对储气库穴壁围岩的损伤演化的影响,结合工程实际,以不同速率下的三轴围压卸载试验为基础,建立扩容与损伤关系模型,并用速率补偿因子对公式进行修正。研究结果表明:(1)在一定条件下,盐岩的扩容可以直观反映其当时状态下的损伤状况;(2)试验中同样的应力路径下,围压卸载速率的增加可以使盐岩的扩容幅度减小,使加速扩容点后移,岩盐的损伤较小;(3)在同一应力条件下,不同的围压卸载速率对损伤的影响表现为速率的对数值与损伤值呈线性关系。
For researching the influence of build-cavity-period on the damage of gas storage library′s surrounding rock,combining with the engineering practice,the triaxial unloading confining pressure experiments under different unloading rates are carried out;and the dilatation-damage model and corrects the formula with correction factor of rate are built. The results show that:(1) Under given conditions,salt rock can intuitively response the damage situation at that time. (2) In the experiments,if salt rock specimens experience the same stress path, increasing unloading rate can make the rock of the dilatation amplitude decrease,speed-up-dilatation point lag,the salt rock damage become lesser. So,the damage control more easily. (3) In the same stress condition,we find that different unloading rates will impact the damage of salt rock. The negative logarithm of rate and damage are linearly correlated.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期3154-3159,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展计划(973)项目(2009CB724606)
高等学校博士学科点专项科研基金资助课题(20090191110001)
国家自然科学基金资助项目(51074198)
关键词
岩石力学
盐岩
围压卸载
扩容
卸载速率
损伤
rock mechanics
salt rock
confining pressure unloading
dilatation
unloading rate
damage
