混凝土水化热对白垩系地层井壁与冻结壁温度影响的实测研究  

Research on the effect of concrete heat of hydration on temperature of the outer wall and frozen wall in Cretaceous strata

作　　者：李博融[1] 奚家米[1] 杨更社[1] 陈新年[1] 屈永龙 

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《采矿与安全工程学报》2015年第2期310-316,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(41272340);陕西省自然科学基金项目(2011JM5002)

摘　　要：在西部白垩系地层煤矿立井冻结法凿井施工过程中,通过分析2个代表性水平层位温度的现场监测数据,得到了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:外壁浇筑后即出现温度迅速增长阶段,两监测层位在1.5 d内温度上升幅度最大可达68.4℃,且粗粒砂岩受水化热影响的温度上升速率大于细粒砂岩;大量水化热使两监测水平保持了较长的正温养护时间,对外壁混凝土早期强度增长有利;同时,释放的水化热使冻结壁出现大范围升温以至局部融化(融化深度达305 mm),对冻结壁的强度造成不利影响。通过分析和探讨水化热对井壁及冻结壁的影响规律,对西部白垩系地层井筒冻结工法设计与施工具有重要意义。In the process of coal mine shaft freezing sinking construction in Cretaceous strata, through analyzing the monitored data of two representative horizontal layers, the basic law of the temperature variations of the outer wall and the freezing wall has been obtained. Research shows that the temperature increases rapidly after the outer walls have been poured; the temperature of the two horizontal layer rises up to 68.4 ℃ in 1.5 d, and the coarse sandstone＇s temperature rising rate of hydration heat effect is faster than that of fine grained sandstone. Amount of hydration heat makes the positive temperature maintenance of the two monitoring levels longer, which can benefit concrete strength at its early growth of the out wall concrete. Meanwhile, the heat causes the frozen wall wide-range temperature rise and partial melting（melting depth reaching 305 mm）, which causes negative impact on the strength of frozen wall. The analysis and investigation of the hydrated heat of concrete effection has instructive significance to shaft freezing design and construction in Cretaceous strata.

关 键 词：温度 水化热 冻结壁 外壁 监测 

分 类 号：TD265.3[矿业工程—矿井建设]