Study on the Effect of Pipe Spacing on the Arch Effect in the Pipe-roof Pre-construction Process Method

Abstract

At present, domestic research on pipe roof pre-construction method mainly relies on construction experience, but has not yet formed an effective theoretical basis. In order to study the influence mechanism of pipe jacking spacing and soil arching effect, the large diameter pipe jacking construction method of pipe curtain preconstruction in Taiyuan Railway Station was taken as the background, according to the theory of soil arching effect, to establish the stress analysis model of soil arch between two pipes with unequal height, derive the strength control formula of apex of arch and arch foot and its applicable conditions, and obtain the calculation equations of pipe jacking distance. With Taiyuan Railway Station tunnel project as an example, the rationality of pipe spacing obtained by the above method was verified. The influence of various parameters of pipe jacking and soil on soil-arch effect was analyzed. It is concluded that with the increase of the angle of adjacent pipe jacking, the arch span is first decreased to the lowest point and then increased. This study has certain reference value for the theoretical research of pipe-roof pre-construction process method in the future.

Keywords

• pipe-roof pre-construction process method
• densely arranged top tube group
• pipe jacking spacing
• the soil arch between the tube
• the soil arch effect