摘要
为研究水化热及冻结规律对井壁及冻结壁的影响,在白垩系地层立井冻结施工中,通过分析2个代表性层位的现场监测数据,得到两壁间温度、径向荷载的基本变化规律:外壁浇筑后,两水平出现温度迅增,冻结压力发展趋势明显;水化热使两水平保持了较长的正温养护时间,也使冻结壁出现大范围升温以至局部融化。并对两水平同一深度处冻结压力平均值随深度变化曲线进行拟合,得到回风立井平均冻结压力随深度的变化规律,确定了冻结压力上限值。
In order to study the effect of hydration heat and freezing law on frozen wall, in vertical shaft freezing construction of the cretaceous strata, through the analysis of two typical horizon of the field monitoring data, we get the temperature between two walls and the basic change laws of radial load. The two levels of outer wall rapidly increase in temperature after casting, and the freezing pressure development trend is obvious ; hydration heat makes two levels keep a longer temperature curing time, also makes frozen wall appear large area temperature rise and partial melting. Through of curve fitting of two levels same depth of freezing average pressure with depth change, we get the average return air shaft freezing stress with depth, the change law of the frozen pressure upper limit is determined.
出处
《煤矿安全》
CAS
北大核心
2015年第5期58-62,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(41272340
41302228)
关键词
冻结法
凿井
监测
冻结压力
温度
freezing method
shaft sinking
monitoring
freezing pressure
temperature
