Study On Mechanics Characteristics Of Freezing Wall And Structure During Shaped Contact Passage Construction By Artificial Frozen Method

Currently,cross passages no matter at domestic and foreign are arranged in straight form,which constructed with artificial ground freezing(AGF)have mature technology.In case the height difference between the tunnels are large,the cross passage cannot be set as the straight channel.It is necessary to set the evacuate platform and the oblique channel in order to lower the channel gradient.The structure of this kind of special-shaped cross passage is complex,and thedisplacement field and the1 structural stability during construction are very different from those of the conventional cross passages.This paper relies on the special-shaped cross passage between Hong Kong Road Station and Sanyang Road Station on line 7 of Wuhan Urban Rail Transit to study the displacement and force law of tunnels,cross passage and frozen walls during the contruction of special-shaped cross passage with AGF.Firstly,the numerical simulation analysis metod was used which included calculate typical parameters,single-factor tests and orthogonal tests.In the typical parameters calculation,the change law of displacement field and stress field of the tunnel,cross passage and the frozen wall with the excavation step of cross passage are obtained.Secondly,the physical simulation test was launched.Based on the similarity theory,the engineering prototype was medeled and subjected into a similarity model.The displacement field and stress field experimental data were obtained and the test data were analyzed after the experiment.Finally,by comparing the results of the numerical simulation method and the physical simulation method,the study verified the reliability and engineering applicability of the two methods.The research results of this paper provide theoretical basis for the engineering design and construction safety if the special-shaped cross passages in the future.