| In the underground engineering structure such as tunnels,in the design of railway and ighway route selection,it is inevitable that the tunnel will cross the fault fracture zone.The study shows at the tunnel lining structure is a dynamic disaster area and a severely affected area in the faultction.This paper adopts the methods of data investigation,theoretical analysis,similar simulation and numerical simulation to test the similarity ratio of the experiment by testing similar materials.Combining physical experiments to analyze the stress distribution and damage of tunnel surrounding rock with different width fault activation and displacement Mechanism and energy transformation relationship of surrounding rock mass,fault zone and supporting structure;by numerical method,when the displacement occurs,the viscous slip of the fault zone is a fuzzy nonlinear action on the lining-surrounding rock-fault Fault adhesion.In this paper,the stress redistribution and energy conversion mechanism are mainly studied in the following papers:(1)The distribution of surrounding rock mechanics of tunnel section is studied.Based on this,the theoretical value of spring stiffness of initial support-secondary lining interaction is derived.By introducing the displacement response value of the fault displacement,the spring stiffness value of the lining structure is calculated to solve the problem of the erratic load blur.(2)With reference to statistical thoughts,combined with similar proportioning test requirements,the similar material ratio model was designed according to the orthogonal experimental theory method.The extreme difference of each factor was discussed by visual analysis method.The influence of the physical and mechanical properties of the material was analyzed,and the results showed that the intensity range was calibrated for similar simulated materials.Combining the dimensional analysis method to study the influencing factors of similar material strength,construct a dimensionless model that affects the uniaxial compressive strength of similar materials,and realize the quantification of similar materials research.(3)Through the previous research on similar materials,similar simulation experiments were carried out to study the characteristics of strain softening according to the main material properties of the lining materials during the experiment,and the conversion value of the prototype dislocations was corrected;The real-time accurate detection of the test process obtained a dynamic simplified model of the dynamic process of the motion disk and the generalization of the failure under the influence of fault activation,and the mechanical conditions affecting the process were studied.The crossfault was studied according to the tunnel structure.The segment position shows a certain degree of "following" and "suppression" to the surrounding rock mass,and analyzes the characteristics and distribution of the structural damage of the tunnel structure.(4)Through the method of numerical simulation,the energy conversion process of the energy exchange system in the whole displacement process of the model is studied.Combined with the intrinsic relationship between the two disc-fault-lining structures,the dynamic relationship between stress concentration and diffusion is explained and analyzed.Under the influence of different widths of active fault displacement,the whole model is calculated,the displacement field of the tunnel lining,the stress field,the variation law of the failure field,and the stress and failure distribution along the axial direction of the tunnel structure.Acquiring the limit stress concentration position of the section measurement point in the axial direction of the lining structure during the dislocation process,the pseudo-normal distribution characteristic of the stress gradient at the motion plate centered on the fault zone and the plastic zone distribution of the lining structure.Figure 38 table 11 reference 53... |
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