白垩系地层煤矿立井冻结压力实测研究  

Study on Site Measurement of Freezing Pressure in Cretaceous Strata Section of Mine Shaft

作　　者：李博融[1] 杨更社[1] 奚家米[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：《煤炭工程》2014年第12期28-31,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,通过分析两个代表性水平层位冻结压力的现场监测数据,得到了冻结凿井期间外壁受冻结压力变化的基本规律。研究表明：白垩系软岩层冻结压力9d内急剧增长,达1.108-1.714MPa,最大值达1.126-1.867MPa,就作用在井壁上的冻结压力发展趋势而言,表现出明显的阶段性特征,即快速增长、均匀增长和稳定阶段。此外,通过对两个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,得到风井平均冻结压力随深度的变化规律,进而确定了冻结压力上限值,为保证冻结凿井施工的安全进行提供了理论依据。In a mine shaft sinking construction process of a mine main shaft in a Cretaceous Strata of Western China,with an analysis on site monitoring and measuring data of the freezing pressures in two typical horizontal layers,a basic law of the freezing pressure variation in an outer wall during the mine freezing shaft sinking period was obtained. The study showed that a freezing pressure of Cretaceous soft rock was seriously increased within 9 days,reached at 1. 108 - 1. 714 MPa and a max value was 1. 126 - 1. 867 MPa. A freezing pressure development tendency on the mine shaft liner had obvious stage features with a rapid increasing,even increasing and stable stage. In addition,with a fitting was conducted on average freezing pressure value of two levels at a same depth with the depth variation curve,a variation law of average freezing pressure with the depth of the ventilation shaft was obtained. An upper limit of the freezing pressure was set up to provide theoretical basis to ensure the safety of the mine freezing shaft sinking construction.

关 键 词：冻结壁 外井壁 冻结压力 监测 

分 类 号：TD265.3[矿业工程—矿井建设]