CAJ | 학술논문

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。
장집매광부정정심280.52～449.69m단유일단층후도체169m적초후점토층，이팽창성후점토위주，위목전국내천월단층점토최후적립정。근거해정통내、외층정벽후도급혼응토강도등급적불동，공포치6개감측수평，대점토층동결벽여정벽온도장진행료실측연구。결과표명，수혼응토초기수화방열여동결관랭량공응적영향，외벽온도변화곡선명현정현3개계단，즉선성쾌속증장계단、비선성쾌속하강계단화추우은정계단。동결벽내부온도변화추세상대교평완，시종처우부온상태。린근정방동토재외벽혼응토요축후적2d내，체도최대융화거리，위200mm좌우。린근정방융토재외벽혼응토요축후적12～14d내，수선진입부온상태，즉산생회동현상。재동결벽여외벽간포설포말소료판，가재일정정도상감소혼응토수화방열여동결관랭량공응간적상호영향。
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 temperature varia-tion tendency of the freezing wall was relatively mild and was in a minus temperature state al-ways.Within two days after the concrete poured in the mine shaft external liner ,the freezing soil ground near the mine shaft liner would reach a max thawing distance about 200mm.With 12~14 days after the concrete poured in the mine shaft external liner ,the thawing soil near the mine shaft liner would be first in a minus temperature state and that is a refreezing phenomenon was occurred.Foamed plastic boards set between the mine shaft freezing wall and external liner could reduce an interaction between the concrete hydration heat and the refrigeration supply of the freezing pipe in a certain de-g ree.