| With the increased use of coal, With the increased use of coal, as well as to speed up the construction of the mine, new mines are mostly in deep coal seams where the geological condition is complex, which is applied freezing sinking in most cases. At the same time, construction of the mine is more and more difficult. Previous well construction design and parameter value becomes limited. This paper in an engineering setting of Huainan Zhangji coal mine second auxiliary shaft freezing sinking, analyzes the development and distribution law of the freezing temperature field, as well as monitoring the sidewall force and researching on the interrelation between the joint action of the freezing pressure and borehole wall, to provide well construction of new mine valuable experience for the future.The result shows that applying the freezing sinking under complex conditions, the freezing temperature field borehole wall cross circle time not only determined by taking water through the hydrological hole, but also obtained by using the theoretical formula and numerical simulation by contrast. Using finite element numerical simulation to obtain freezing wall development speed in the different soil speed is divided into:coarse gravel sand>grit>clayey sand>sandy clay>consolidated clay> calcareous clay. The temperature rises, slowly declines, finally reaches a steady state. Local chip help phenomenon wellbore driving and masonry construction process, accelerate the speed of the driving and masonry, to accelerate the speed of anti-chip hole frozen. When driving and masonry arrive at the reducer of150meters. The wellbore appears circumferential cracks. Wall claw should be set in the adjustable mold back and forth to improve the strength of concrete. So as to achieve a safe, effective construction. It provides a valuable reference for future the design and construction of the freezing borehole wall in similar complex geological conditions. |
PDF Full Text Request