白垩系井筒冻结壁温度场数值分析研究  

Numerical Analysis on Temperature Field of Freezing wall in Cretaceous Strata

作　　者：李博融[1] 杨更社[1] 奚家米[1] 陈新年[1] 

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：《煤炭工程》2015年第4期11-14,共4页Coal Engineering

基　　金：国家自然科学基金资助项目(41272340);国家自然科学基金项目(41302228);陕西省自然科学基金资助项目(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,通过对冻结壁温度场进行数值分析,结合现场温度实测数据,得到了冻结凿井期间冻结壁温度变化的基本规律。研究表明:冻结壁的发展过程可以分为初始冻结、积极冻结以及维护冻结三个阶段;冻结管内侧的冻结壁受冻结管的影响大于外侧的冻结壁,且距冻结管越远,温度下降的速率越缓慢;随着浇筑混凝土水化热的释放量减小,靠近外壁的部分冻结壁出现二次回冻,并且测温点到外壁的距离也影响各测点达到峰值温度所需时间。通过对凿井施工过程中温度场的数值分析结合温度监测数据,可准确地对冻结壁的交圈时间及强度等作出分析,从而指导西部白垩系地层井筒冻结工法设计与施工。In the coal mine shaft freezing sinking construction in Cretaceous strata, through numerical analysis of freezing wall temperature field, combining with measured data, the basic law was obtained on temperature change of freezing wall during freezing sinking. Research shows that ： the development of freezing falls into the initial period, formable period and maintaining period ; the inner freezing wall of the freezing pipe is affected more significantly than the outer wall, and the farther away from freezing pipe, the lower is the temperature drop rate; as the hydration heat release of concreting decreases, part of the freezing wall close to the outer wall appears secondary freezing, and the distance between temperature measuring point and the outer wall also affects the time needed to achieve peak temperature for each measuring point. Through the numerical analysis of temperature field in shaft sinking construction combining with monitoring data, precise analysis can be realized for time and strength of freezing wall connection, for shaft freezing design and construction in Cretaceous strata.

关 键 词：白垩系 冻结壁 温度场 数值分析 

分 类 号：TD265.3[矿业工程—矿井建设]