摘要
通过龙固副井冻结凿井期现场实测，获得了龙固副井外层井壁混凝土应变的变化规律．结合高强混凝土的极限压应变，分析了井壁结构的安全性．研究表明：外层井壁浇筑后，混凝土首先产生拉应变，而后随井壁温度下降而逐渐减小并转变为压应变．环向最大压应变一般为同一监测层位竖向、径向最大压应变的2～4倍．在龙固副井施工中，井壁环向最大压应变达2221με，约为极限压应变的76．6％，处于安全状态．
Variety rules of concrete strain of outer shaft wall were carried out based on in-situ measurement during freeze sinking of Longgu Mine auxiliary shaft. Safety of the shaft wall was discussed taking into account of ultimate compressive strain of high strength concrete （ HSC ）. The study proved that tensile strain arose firstly in the outer shaft wall after it＇ s building, then decreased gradually with decreasing of temperature, finally, it converted to compressive strain. Generally, the maximum tangential compressive strain was 2 -4 times of vertical and radius-orientation direction. The maximum tangential compressive reaches 2 221 με, which is about 76.6% of the ultimate compressive strain, within safe status.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2006年第3期296-300,共5页
Journal of China Coal Society
基金
国家自然科学基金重点资助项目(50534040)
中国矿业大学青年科研基金资助项目(2005A006)
关键词
冻结凿井
外层井壁
混凝土应变
freeze sinking method
outer shaft wall
concrete strain
