【摘要】 通过龙固副井冻结凿井期现场实测,获得了龙固副井外层井壁混凝土应变的变化规律.结合高强混凝土的极限压应变,分析了井壁结构的安全性.研究表明:外层井壁浇筑后,混凝土首先产生拉应变,而后随井壁温度下降而逐渐减小并转变为压应变.环向最大压应变一般为同一监测层位竖向、径向最大压应变的2~4倍.在龙固副井施工中,井壁环向最大压应变达2 221με,约为极限压应变的76.6%,处于安全状态.更多还原

【Abstract】 Variety rules of concrete strain of outer shaft wall were carried out based on in-situ measurement during freeze sinking of Longgu Mine auxiliary shaft.Safety of the shaft wall was discussed taking into account of ultimate compressive strain of high strength concrete(HSC).The study proved that tensile strain arose firstly in the outer shaft wall after it’s building,then decreased gradually with decreasing of temperature,finally,it converted to compressive strain.Generally,the maximum tangential compressive strain was 2~4 times of vertical and radius-orientation direction.The maximum tangential compressive reaches 2 221 με,which is about 76.6% of the ultimate compressive strain,within safe status.更多还原