Regression analysis of influence law of urban pavement settlement caused by underpass tunnel construction in Beijing

Taking the pavement settlement caused by pipe jacking tunnels in thermal engineering in Chaoyang District of Beijing as an example, the on-site measurement value and the theoretical computation values that only considering natural factors were compared and analyzed. With 279 tunnel underpass projects in Beijing as samples, the multiple regression analysis was carried out with the statistical software Stata 14.0, where four design factors, three construction factors, and nine human factors affecting the pavement settlement were involved. Then, the robustness of regression analysis was verified by the replacement of the construction methods and the addition or subtraction of interpretation variables, and the elasticity coefficients, standard errors, and the confidence levels of each factor affecting pavement settlement were obtained. Analysis results show that a huge difference exists between the on-site measurement and the theoretical computation in the pavement settlement, which is related to the existence of moving loads on the pavement and the thickness of the overlying soil of tunnels, with a maximum of up to 3.75 times. Of the natural factors, the influence of geological condition, construction method, moving load on the pavement, and tunnel diameters are significant, and the degree of influence decreases in turn. Of the human factors, on-site supervision plays a significant role, and working years of constructors and technical disclosure also have a great impact. In the construction of an underpass project with a non-excavation method, we should reduce the manual pipe jacking, accelerate construction, and consolidate synchronous grouting to decrease the pavement settlement, and great significance should be attached to the construction technology and process, personnel organization, and process supervision. The research results can provide a reference for the technical management, safety assessment, and administrative approval of the construction of tunnels undercrossing urban roads. © 2022, Editorial Department of Journal of Traffic and Transportation Engineering. All right reserved.