张集煤矿副井井深280.52-449.69m段有一单层厚度达169m的超厚粘土层,以膨胀性厚粘土为主,为目前国内穿越单层粘土最厚的立井。根据该井筒内、外层井壁厚度及混凝土强度等级的不同,共布置6个监测水平,对粘土层冻结壁与井壁温度场进行了实测研究。结果表明,受混凝土初期水化放热与冻结管冷量供应的影响,外壁温度变化曲线明显呈现3个阶段,即线性快速增长阶段、非线性快速下降阶段和趋于稳定阶段。冻结壁内部温度变化趋势相对较平缓,始终处于负温状态。邻近井帮冻土在外壁混凝土浇筑后的2d内,达到最大融化距离,为200mm左右。邻近井帮融土在外壁混凝土浇筑后的12-14d内,首先进入负温状态,即产生回冻现象。在冻结壁与外壁间铺设泡沫塑料板,可在一定程度上减小混凝土水化放热与冻结管冷量供应间的相互影响。
An auxiliary shaft of Zhangji Mine was a deep mine shaft.There was an ultra thick clay stra-tum with a thickness of 169m located in the mine shaft at a depth section from 280.52~449.69m.The ultra thick clay stratum was swelling thick clay mainly and was a single highest thick clay stratum pas-sed by a mine shaft in China.According to the thickness of the mine internal and external shaft liners and the different grade of the concrete strength ,there were 6 monitoring and measuring levels set in the mine shaft and a site measurement study was conducted on the temperatures fields of the freezing wall and the mine shaft liner in the clay stratum.The results showed that due to influenced by the ini-tial hydration heat emission of the concrete and the refrigeration supply of the freezing pipe ,a tempera-ture variation curve of the external shaft liner would have three stages obviously and they were a linear rapid increasing stage ,nonlinear rapid decreasing stage and stable stage.An inner te