In order to reinforce the loose

high moisture and unstable strata in the underground engineering artificial freezing method was commonly used

and vertical straight layout of the frozen pipes was used frequently. However

the distribution and changes of temperature

stress and displacement were completely different from vertical circular layout

thereby induced engineering stability problems were paid less attention

which need further investigation both at home and abroad. On the basis of an inclined shaft freezing construction

the similarity criteria in the vertical straight freezing process were derived

which contained temperature field

stress field and moisture field

etc. Specific experiment program during the total process of soil freezing was designed detailedly. In self-made three-dimensional simulation freezing experiment system

20 vertical frozen pipes were layout as 4×5 form. Stress environment and seepage condition were simulated as possible as field conditions. The value and change rate of soil temperature and horizontal frost heaving force were measured during the process of soil freezing. On this basis

the distribution of soil temperature and horizontal frost heaving force in different depth were investigated. Experiment results show that in vertical straight freezing

the impact of soil depth on the horizontal frost heaving force is significantly. In the same depth and ignoring the impact of other conditions

the value of frost heaving force and soil temperature are closely related; the change rate of frost heaving force mainly depends on the location of freezing front

which reaches its peak gradually by the distance close to freezing front; while the horizontal frost heaving force in frozen soil has stabilized with the development of freezing front.