中国矿山工程

In order to investigate the influence of freeze-thaw process on the temperature and mechanics of mine shaft wall under freezing construction conditions, the soil and shaft wall model was established by ABAQUS software, taking the lower reaches of Lalingoli River as an example. The characteristics of soil temperature distribution, wall Mises stress, and the evolution of vertical and thawing additional forces with temperature during freezing and thawing were analyzed by numerical simulation. The results show that the value of vertical additional force is stable below 0℃, and when the temperature exceeds 0℃, the vertical additional force decreases rapidly along with the melt settling process. In the process of 0~5℃, the additional force of melt settling increases rapidly, and when the temperature exceeds 15℃, the additional force of melt settling reaches a stable state. Under the influence of depth, the stress of borehole wall is mainly controlled by ground stress. With the gradual increase of formation depth, the maximum value of the additional force shows an exponential trend.