Frost Heave Characteristics of Ground Reinforced by Cement Pre-reinforcement-artificial Freezing Combined Method
Taking the freezing project of a connecting passage on Guangzhou Metro Line 14 as the background,a joint construction method was adopted.A three-dimensional numerical model of the freezing and swelling displacement field of the connecting passage was established through finite element software.The influence of salt water temperature and cement content on soil freezing and swelling displacement was studied,and the surface freezing and swelling displacement under different freezing wall thicknesses and the plastic area of the excavated soil in the connecting passage were calculated.Under the premise of ensuring construction safety,further optimize the design parameters of the frozen wall to reduce soil frost heave displacement.The results show that when the cement content is set to 12％and the saline temperature is controlled at-31～-25 ℃,the surface frost heave displacement can meet the engineering monitoring requirements at the end of active freezing.The cement content is set to 12％,the thickness of the frozen wall is set to 1.8m,and the brine temperature is controlled at-31 ℃.It can be seen that compared with the original construction scheme,the surface frost heave at the end of active freezing is reduced by 73％by using the combined construction method.
joint construction methodfrost heave displacementnumerical simulationfreezingcement
万方数据
维普
