Freezing Inclined Shaft Simulation Experiment Of Vertical Straight Multi-row And Stability Research On Frozen Soil

Vertical straight multi-row freezing was commonly used in inclined shaft freezing construction. Researches on temperature and forst heaving force in this condition were seldom introduced. In this dissertation, a3-Dimensional large-scale inclined shaft model experiment was conducted, which could simulate process of vertical straight multi-row freezing. The frozen wall’s forming process, temperature distribution and frost frontal surface’s movement was analyzed by experimental data. According to mechanism of frost heave and freezing front, simplification hypothesis adopted here comply with engineering practice. Further, the temperature distribution, average temperature of frozen wall, and frost heaving force analytical calculation model were introduced, and obtain soil frost heaving force’s estimated values in any frozen wall surrounding position were also presented. Engineering parameters of Shuang Shuzi Coalmine inclined shaft freezing project in Liaoning province were studied, Using FLAC, a numerical simulation was conducted to the temperature and forst heave force. The comparison on the field test data and the analytical results shows good agreement. So the feasibility of the theoretical calculations under the simplified assumptions was verified. For studying and preventing of soil frost heaving phenomenon caused by artificial vertical freezing, this dissertation could provide important reference value and practical signifiance.