| There are a large number of sluices in the subsidence area of China.The mining deformation will cause uneven settlement of the sluice,which will adversely affect the upstream and downstream production and life.Therefore,it is of great significance to study the treatment of uneven settlement of sluice.The jacking technology is one of the effective methods to control the uneven settlement of the sluice.The premise is to clarify the influence of the mining deformation on the sluice.However,there are few studieshe influence of the effect of mining deformation on the sluice,so it is necessary to conduct in-depth research.In this paper,the numerical simulation method is used to systematically study the influence of sluice under typical surface deformation（tensile deformation,compression deformation,oblique deformation,positive curvature deformation,negative curvature deformation）.Then the theoretical analysis and numerical simulation method were used to study the jacking technology which is applicable to the project,and the optimal design scheme was proposed.The main work and achievements are as follows:（1）According to the theoretical calculation,the actual results of the horizontal,inclined and curvature deformation of the surface below the sluice are obtained.Based on actual results and existing research,20 different typical surface deformation conditions were developed for subsequent numerical simulations.（2）The elastoplastic model of the sluice structure is established by the software ABAQUS.The parameters of the Mohr-Coulomb model,the concrete damage plasticity model and the steel bar were obtained by experiment and so on.The initial stress balance of the model was carried out,and the maximum settlement level was10-5m.（3）The stress,settlement and damage law of sluice under tensile deformation,compression deformation,oblique deformation,positive curvature deformation and negative curvature deformation are studied.It is found that the action of tensile deformation and positive curvature deformation on the sluice is basically the same.Under these two deformations,the most unfavorable position appears in the middle of the sluice floor;the compression deformation and the negative curvature deformation are basically the same for the sluice.The most unfavorable position appears in the intersection of the pier and the floor.The oblique deformation causes the sluice to produce significant uneven settlement.Combined with the theory,the correctness of the model establishment is verified.（4）Using the pressure grouting jacking method to correct the sluice,the theoretical method is used to derive the grouting pressure expression,and compared with the actual project,the correctness of the expression is verified.Studies have shown that the pressure of grouting is related to the depth of grouting pipe and the nature of the soil.（5）Using numerical simulation method,the influence of different number of jacking points on the sluice is studied.The results show that with the increase of the number of jacking points,the effect of the sluice is better.When the six jacking points are set,the difference between the maximum tensile stress of six jacking points and the ideal state is only 0.028 MPa,which indicates that the six jacking loading points have achieved good jacking effect.Combined with the existing research results and the research results of this paper,an optimal design scheme for the sluice jacking and rectifying technology is proposed.The paper has 67 pictures,21 tables,and 107 references. |
