Freezing Wall Temperature Field Based On Mechanical Characteristics Of The Trapezoidal Profile

For clayey soil layer deep impact construction technology of freezing method is widely used. Frozen wall deformation magnitude relationship between the success of the coal mine shaft sinking construction. By engineering the frozen wall of typical parts of simplification, that the freeze wall is of uniform thickness elastoplastic body, rendering the temperature distribution within the trapezoidal distribution of such FGM type freezing wall analysis obtained by the theory of elasticity frozen wall, playing plastic, plastic stress field analytical solution, the formula works by checking the instance analysis:based on the DP guidelines and criteria based on the frozen wall bearing capacity of MC are relatively plastic zone with a radius of parabolic increase, but the frozen wall based DP criteria have better bearing capacity; radial stress frozen wall with the relative increase in the radius r increases, the hoop stress in the section i, ii, iii presents different variation. For Guqiao Dong into the air shaft in the elastic ultimate load (p=3.22MPa) effect, frozen wall hoop stress at r= 1.4 the maximum reached at 6.20MPa; the role of the plastic limit load (p= 10.05MPa), frozen wall hoop stress in the maximum reached at r= 2.222.41 MPa; in addition, the frozen wall plastic zone hoop stress is independent of the external load size, and its location just related. The freeze wall at a depth of 350m and 400m at withstand external loads, respectively p= 4.55MPa and p= 5.20MPa, the load is greater than the elastic limit of the load, but far less than the plastic limit load. FGM feature freeze on the wall using the finite element software to simulate excavating state calculations. The numerical results found frozen wall under excavation state level to the maximum displacement occurs at the location of the high school section of the upper part of the excavation, the excavation 1/3 position high segment, compared with the actual situation of the excavation project agreement; frozen wall vertical the overall value of the displacement is relatively small, mainly in the peripheral area of the excavation section and heading off excavation apparent floor heave phenomenon, which cause greater threat to the safety of the construction project, you need to take measures to control. Finally, a plurality of wellbore Yellow River Basin on-site measurement, frost heave force to study the law of development, research data have more practical significance. Meanwhile, the theoretical solution checking, numerical analysis and field measurement results in three areas remained the same, reflecting the reliability of the results.