Study On The Influence Law And Harmfulness Of Skewed Ground Cracks On The Stress Of Integrated Pipe Corridor Structure

With the rapid development of China's economic construction and the continuous advancement of urbanization,the construction of infrastructure in major cities is in full swing.As one of the lifeline projects in the new urban infrastructure of the 21st century,the integrated pipe corridor guarantees the normal operation of the city's functions,and is more resistant to the destruction of pipelines by external factors.As a linear engineering and a large-scale distribution of Xi'an area,the integrated pipe gallery will inevitably encounter the situation of oblique crossing through ground fissures.Based on this,the three-dimensional nonlinear analysis system ABAQUS is used to synthesize the structure of the diagonally intersecting ground fissures.The main research work and achievements of the study on the influence of force and the harmfulness are as follows:(1)The research status of und'erground structure hazard under ground fissure environment is discussed.The distribution characteristics,activity characteristics and disaster characteristics of Xi'an ground fissures are summarized and analyzed.The maximum vertical settlement of ground fissures is predicted to be 50cm.(2)Using ABAQUS,establish a three-dimensional nonlinear analysis model of integrated pipe corridor response under ground fissure environment.Including the selection of the constitutive model,the setting of the interaction relationship of the contact surfaces,the setting of the boundary conditions,and the realization of the ground fissure simulation.(3)With different dislocations and different skew angles as the influencing factors,the soil surface settlement law,structural displacement law,structural axial stress law,structural shear stress law and floor voiding analysis are respectively carried out.The research shows that in the oblique ground fissure environment,the S-shaped bending deformation occurs in the horizontal misalignment of the ground fissure;The void area is generated.When the misalignment is 50cm,the maximum void length is 26m.The larger the skew angle is,the smaller the impact of the integrated pipe gallery is.It is recommended to avoid small-angle oblique ground cracks during construction.(4)Starting from the structural control measures of ground fissure disease,the inter-ground crack setting mode and the ground fissure setting mode are mainly used to study the force law and deformation of segmented structures with different deformation gaps and different dislocations.The displacement law of the seam.The research results show that the deformation degree of the structure is significantly reduced by the deformation joint measures,and the smaller the deformation joint spacing is,the better the deformation ability of the trans-soil fracture section adapts to the ground fissure;the spatial displacement of the deformation joint under the ground fissure In the case of the ground crack setting mode,the spatial displacement of the deformation joint is large,which is not conducive to the waterproofing of the deformation joint.The comprehensive analysis should suggest a measure of the deformation joint spacing of 10m.