Study on the influence of large section pipe curtain box culvert jacking on surface deformation

It is of great significance to study the influence of the whole jacking process of the curtain box culvert on soil deformation and surrounding environment in advance to predict deformation and control the influence of construction disturbance. A calculation method for surface deformation under the combined action of frontal propulsion, friction and soil loss is obtained based on the classical theoretical solutions such as Mindlin solution and revised Sagaseta formula. The soil mechanical model under the jacking process of the curtain box culvert is established, and the calculation formula of soil deformation caused by frontal propulsion force and friction force is given based on Mindlin solution. The formula of lateral land surface settlement caused by soil loss is proposed based on the principle of the equivalent layer method. According to the relative independence of each influencing factor, the deformation caused by each factor is superimposed to obtain a theoretical solution formula suitable for the large section pipe curtain box culvert jacking, which can comprehensively consider a variety of construction factors and three-dimensional deformation of soil. The rationality of the formula is verified by engineering examples, and the research results can provide references for the actual construction deformation prediction.