摘要
通过对龙固副井冻结凿井期间外壁与冻结壁温度的现场实测,研究了冻结壁温度场对外壁水化热温度场的影响,获得了特厚冲积层冻结凿井期间外壁及冻结壁温度变化的基本规律.研究表明:内部高水化热的释放,使外壁混凝土获得了至少17 d的正温养护时间,其早期强度增长不受低温影响;同时,高水化热的释放导致井壁内外出现较大温差(甚至超过25℃),增大了温度裂缝控制的难度;水化热的向外传导还导致壁后冻土的显著升温及局部融化,对外壁受力造成了不利影响.
Based on the in-situ measurement of temperature during freezing sinking, the influence of the temperature field of ice wall on that of outer shaft wall was studied. The basic rules of the temperature varying were obtained. The results show that the temperature of outer shaft wall kept positive for at least 17 days due to the massive hydration heat, consequently, the early period strength of the shaft wall was not affected. Prominent temperature differences（ even exceeding 25℃） between the interior and the exterior of the shaft wall, which were also brought by the massive hydration heat, made it more difficult to control temperature cracks. The massive hydration heat also led to temperature increasing prominently and thawing of frozen soil in the ice wall, which were unfavorable to the outer shaft wall.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2006年第4期468-472,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金重点项目(50534040)
关键词
冻结凿井
外壁
冻结壁
温度
现场测量
freezing sinking
outer shaft wall
ice wall
temperature
in-situ measurement
