摘要
为了寻求能体现轴对称圆巷支护结构的被动支护反力连续变化的蠕变求解方法,在被动支护反力恒定条件下的求解公式的基础上,考虑到围岩的蠕变变形是一个连续变化的过程,提出被动支护反力连续变化条件下的迭代算法,并应用该迭代算法对工程实例围岩蠕变变形进行计算分析。计算结果表明:围岩的蠕变变形对原岩应力的大小很敏感;在支护刚度一定的条件下,支护反力的增加速率对原岩应力的大小很敏感;地应力较大条件下支护结构提供的支护反力对围岩蠕变变形的控制作用甚微。
In order to find a creep solution which can reflect continuous changes of passive support force for axisymmetric round well,an iterative algorithm based on the creep solution of constant passive support force was raised by taking the continuous changes of creep deformation of surrounding rocks into account. The algorithm which shows the changing process of passive support force was already used to calculate the creep deformation of surrounding rock. Result indicates that creep deformation of surrounding rocks is sensitive to the value of initial stress. Under certain support stiffness,the increasing rate of support force is sensitive to the value of initial stress. Support force has little effects on the control of surrounding rocks creep deformation in condition of large in-situ stress.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第S1期3355-3360,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金委员会与神华集团有限责任公司联合资助重点项目(U1261212
U1361210)
博士点基金资助项目(20120023110015)
关键词
岩石力学
围岩蠕变变形
被动支护反力
轴对称圆巷
迭代算法
支护效果
rock mechanics
creep deformation of surrounding rocks
passive support force
axisymmetric round well
iterative algorithm
supporting effect
