Research On Evaluation Method Of Drainage State Of Tunnel Lining Drainage System Unit Network

The tunnel lining drainage system is generally blocked and damaged,causing water leakage in the tunnel,which seriously affects the service status of the tunnel lining and the overall operating environment of the tunnel.Because the tunnel lining drainage system and its diseases are concealed,along the longitudinal direction of the tunnel,if there is no corresponding appropriate quantitative method for the tunnel lining drainage system,it can be used to evaluate the drainage state of the tunnel lining drainage system when it is intact or when there is a disease.It is not conducive to the in-depth study of the degree of optimization of the tunnel lining drainage system by the leakage treatment measures.Therefore,the key task of this article is to establish a quantitative evaluation method for the drainage state of the tunnel lining drainage system under the condition of contingent diseases.（1）Through theoretical analysis,the basic composition and quantitative form of the tunnel lining drainage system network were explained,which was divided into three levels:unit and system level,pipe section level and node level,and summarizes the network properties of tunnel lining drainage system.The connotation and index factors of the drainage state of the drainage unit of the tunnel lining were defined,and the drainage state indexes of the straight-edged round pipe,straight-edged square pipe,curved-edged round pipe and multi-pass nodes were calculated respectively based on the geometric form of the pipeline,and the tunnel lining was analyzed After the drainage behavior and path of the groundwater in the drainage system,a calculation method for the weight of the drainage unit network was proposed,and a quantitative evaluation model for the drainage state of the tunnel lining drainage unit network was constructed.（2）Combined with field investigation and theoretical analysis,the types,abstract forms and specific classifications of the tunnel lining drainage unit diseases were discussed,and the effects of different disease forms such as partial blockage,multi-node blockage,partial leakage and multi-node leakage on the node drainage status indicators were quantified.Form and quantitative degree,and then put forward a quantitative evaluation method to measure the comprehensive drainage state of the lining drainage unit in the presence of disease,which can effectively evaluate the quantitative degree of the drainage function affected by the disease.（3）After combing the optimization structure and treatment measures of the current tunnel lining drainage system,the elastic concept and connotation of the tunnel lining drainage unit were put forward.Based on the comprehensive drainage state evaluation,a quantitative evaluation method of drainage elasticity was proposed,and the inherent network attribute E₀was selected as the calculation index of drainage elasticity,and a comparative example was set up to verify the drainage elasticity evaluation method of the optimized structural unit.At the same time,the impact of visibility and repairability measures on drainage elasticity was discussed,and it was verified that drainage elasticity can be used to quantitatively evaluate the improvement degree of drainage function by the optimized structure and comparison of the advantages and disadvantages between the structures.