| Steel corrugated pipe gallery has the advantages of excellent mechanical performance,short construction time,low cost and good environmental protection performance.Its good energy absorption characteristics can largely alleviate the stress concentration caused by load in the structure,and has been widely used in various fields of Engineering in our country.At the same time,once the foundation settlement occurs due to the soft soil or insufficient bearing capacity of the steel corrugated pipe gallery,it will cause more secondary hazards.At present,the research on the pipe gallery mainly focuses on the steel corrugated pipe with small span such as drainage ditch,while the research on the comprehensive underground pipe gallery with large section is relatively less.The demand for the span of steel corrugated pipe gallery in China’s underground pipe gallery,road and related fields is increasing.In order to ensure the safety of pipe gallery in construction and operation,it is necessary to systematically study the mechanical behavior of pipe gallery in the process of engineering construction and operation,and carry out fine numerical simulation,which is of great significance for fine design,construction safety,and protection measures of pipe gallery deformation caused by uneven settlement of foundation It has practical guiding significance.The main work of this paper is as follows:1.According to the design requirements of corrugated pipe gallery,this paper summarizes three methods used in China to calculate the vertical earth pressure on the top of pipe.Referring to the load design and calculation methods of steel corrugated pipe gallery abroad,this paper lists four codes of the United States,Canada and South Korea,and analyzes the advantages and disadvantages of parameter calculation and value selection methods in different codes,In this paper,the optimized load design formula of pipe gallery is proposed and verified by an example.The results show that the optimized formula is better than the American highway bridge and culvert code,and more safe than the Canadian code.2.ABAQUS is used to simulate the influence of various parameters of soil steel structure on the structure stress and the analysis of the factors affecting the stress at the junction of pipe gallery.The results show that:（1）with the increase of the ratio of backfill height to pipe gallery diameter H/D,the equivalent force of each measuring point also increases;to a certain extent,increasing the elastic modulus and internal friction angle of backfill is conducive to reducing the stress and deformation of pipe gallery;with the increase of wall thickness,the vertical displacement of pipe top decreases by 30%,and the equivalent force decreases by 71.4%,which shows that the influence on the structure is greater than that on the structure With the increase of pipe gallery spacing,the earth pressure on the upper part of pipe gallery decreases.（2）When the wall thickness of the pipe gallery is less than 7mm,the ultimate bearing capacity of the bolt increases;when the wall thickness is greater than 7mm,the ultimate bearing capacity of the bolt tends to be stable;when the end distance is d=60mm（2.7d0）,the bearing capacity of the connector does not change greatly,so it is recommended to use;with the increase of the bolt preload,the bearing capacity of the connector increases.3.Considering the influence of uneven settlement of foundation,the structure will produce the phenomenon of stress concentration,and considering the symmetry of the structure,it is divided into two regions,the end AB region（0m-2.4m）,the middle region BC（2.4m-4.0m）.In this paper,only the AB region and BC region are studied by numerical simulation,and the R-CSP（Rubber-Corrugated Steel Pipe）structure is proposed.The results show that R-CSP can effectively reduce the displacement and equivalent stress caused by the settlement of the structure in different areas,and improve the mechanical performance of the structure. |
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