摘要
为及时掌握冻结法施工过程中煤矿井筒穿过厚黏土层时外壁受力及温度分布情况,采用信息化监测技术长期监测某矿井筒外壁的安全状况。研究2个监测水平冻结压力、混凝土应变、钢筋应力以及外壁温度随施工进度的变化关系。结果表明:冻结压力、混凝土环向应变、钢筋应力三者的实测最大值均小于设计值;混凝土竖向应变实测最大值虽大于设计值,但由于混凝土与钢筋共同受力作用,对井壁整体承载力影响不大,井筒仍处于安全状态。若外壁降温梯度大,则井壁混凝土极易产生裂纹,不利于后期防治水工作。
A certain coal mine shaft in a thick clay layer was monitored during its construction using information techology for its external wall＇s condition of safety. The freezing pressure, concrete strain, steel bar stress and external wall temperature were studied as a tunction of time. It was found that maximum values of freezing pressure, circumferential strain of concrete and stress of steel bar are all less than the design values. Maximum vertical strain of concrete exceeds the design value, however, which has only a little effect on overall load capacity of the shaft, it is still safe, and that a large external wall temperature gradient causes, shaft lining concrete easy to crack, which is disadvantageous to prevention and control of water in the later stage.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2016年第4期137-143,共7页
China Safety Science Journal
基金
国家自然科学基金科学部主任基金资助(51044004)
高等学校博士学科点专项科研基金资助(20133415110004)
关键词
厚黏土层
冻结法施工
煤矿井筒
安全监测
冻结压力
混凝土应变
钢筋应力
外壁温度
thick clay layer
freezing method construction
coal mine
safety monitoring
freezing pressure
concrete strain
reinforcement stress
outer wall temperature
