西部白垩系冻结立井外壁受力与温度实测研究  

In- situ Measurement Study on Stress and Temperature of Frozen Outer Shaft Lining in Western Cretaceous Strata

作　　者：奚家米[1] 屈永龙 杨更社[1] 陈新年[1] 李博融[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：《煤矿安全》2014年第8期68-71,共4页Safety in Coal Mines

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

摘　　要：为解决西部白垩系富水地层冻结法凿井的技术难题,采用振弦传感器和热电偶对甘肃某矿风立井外壁竖筋、环筋受力与冻结压力的变化规律和成因以及外壁温度场的变化等进行实测。结果表明,外壁竖筋先受压后受拉,最大拉应力达81.711 MPa,环筋均受压,最高为-42.113MPa;冻结压力达1.098-1.724 MPa,但远小于东部冲积层限值;外壁浇筑后急剧升温,最高为62.3℃,随后迅速降低并低于-10℃,同一点前后温差在70℃以上;井壁设计过于保守,施工进度慢、成本高,对西部立井井壁设计施工需进一步优化。To solve the technical problems of the freezing shaft sinking in western cretaceous water - rich strata, vibrating wire sensors and thermocouple are used to measure and analyze the stress and temperature of frozen shaft wall in a Gansu mine air shaft, analyze the change laws and reasons of the stressed shaft liner vertical and circular steel bars and freezing pressure, and the temperature field. The result show that the vertical steel bars are first under compressive stress and then tensile stress, the maximum tensile stress is 81. 711 MPa, the circular steel bars are always under pressure and the maximum reaches -42.113 MPa, the maximum of freezing pressure can be 1. 098 to 1. 724 MPa, which is far less than the limit of eastern alluvium, the temperature of outer liner rise sharply after constructed and the highest be 62.3 ℃, then drop to below 10 ℃ and the difference value is as high as above 70 ℃, the shaft lining is too thick and cost is high, so the design and construction of western vertical shaft need to be further optimized.

关 键 词：白垩系地层 冻结法 立井外壁 受力特性 

分 类 号：TD265.32[矿业工程—矿井建设]