Research On Deformation Law Of Pipeline Engineering In Loess Excavation And Embankment Volume

High-speed development of China’s central and western loess area construction lead to high fill sites increasing, along with "the sparse extended, the mountain city of" development strategy, Yan’an New Area "cut Mountains making the city" project has become the loess region "cut mountains one filled ditch, made the earth, to build the city ’s largest engineering, construction settlement after the ensuing distortion control, fill slope on static and dynamic stability and other issues have become the focus of research.Paper relies Shaanxi Province Science and Technology Innovation Project co-ordination "Yanan Loess Hilly Region Construction Engineering Research Problems major geological and geotechnical engineering," Take Yan’an new area as the background, using the indoor physical model tests and finite element software numerical simulation method, the law of deformation and stress characteristics pipeline project carried out a series of square cut and fill loess sedimentation area, through analysis and simulation verification test, the following findings:1, the design and construction of the model test apparatus, for subsequent model test under different working conditions laid a foundation;2, through the analysis of the displacement data, the simulation of subsidence displacement of pipeline and soil under the action of change law, summed up the directly buried pipeline displacement curve is "S" type change, common ditch the deformation characteristics of change of displacement curve is linear;3, through the analysis of the strain data, obtained the directly buried pipeline and common ditch under the effect of simulated subsidence pipeline stress change rule of pipelines is summarized in the fill area upper pressure lower tension, fill in digging area upper tension lower compressive force characteristic;4, based on the analysis of the pressure data, the simulation of sedimentation pipe, the change rule of earth pressure of surrounding rock under the action of soil are summarized in the surface tension, fill in digging area tensile shear, the tensile stress at the bottom of the fill area pipeline characteristic;5, summarizes the simulated subsidence under the action of the stress of the pipe and common channel distribution, based on the elastic foundation beam theory proposed the directly buried pipeline and the common ditch under the effect of settlement calculation model;6, based on the comprehensive analysis of experimental results, summarized the subsidence under the action of directly buried pipeline and several common tunnel deformation failure mode, and from two aspects of structural design and settlement deformation control three targeted prevention measures are put forward, respectively is equipped with flexible joints, local reinforcement design and "the settlement deformation recovery method.Based on previous research results on the pipeline project through orthogonal deformation characteristic of loess square cut and fill areas and mechanical characteristics were studied to obtain some understanding of the laws. Design of Disaster Prevention and Mitigation article ideas and results achieved on the side of cut and fill sedimentation area under pipeline project has a certain reference value.