Ecological Environment Of Tunnel Engineering In Reclamation Area Impact Evaluation Research

With the growth of my country’s national economy,the level of social urbanization and industrialization has increased significantly,especially the coastal areas have become an important support for the national economy.In order to alleviate the contradiction between the large population and limited land resources,expand the available space of the city,and maximize the value of the city,more and more underground engineering projects are newly built under the special geological conditions of reclamation silt formation.However,due to the engineering characteristics of “three highs and three lows” in reclamation silt areas,the construction of tunnels under complex and changeable geological conditions is bound to change the original geological environment and cause the redistribution of surface water and groundwater.At the same time,there will be strong impacts and vibration noises during the construction process,which will greatly affect the ecological environment within the region.Therefore,under such special and complex geological conditions,it is very necessary to study the impact of the new tunnel project on the ecological environment and make an evaluation.First,on the basis of reading domestic and foreign research status on reclamation silt area construction projects,ecological environmental impact assessment and evaluation methods,summarized the physical and mechanical properties of the reclamation silt stratum and engineering structure characteristics and the construction principles of reclamation tunnel projects.,Comparative analysis of the basic methods of commonly used ecological environmental impact assessment.Secondly,understand the actual situation of the Shenzhen Mawan Cross-Sea Passage Project and build an ecological environment impact assessment index system.After clarifying the basic principles and evaluation methods for the establishment of the ecological environment evaluation index system of the reclamation silt area,referring to the relevant norms and standards,combining the actual key points of the project,the geological environment factors that affect the ecological environment impact evaluation of the Mawan Cross-sea Passage Tunnel Project are analyzed.Through the use of questionnaire survey method to further screen the evaluation indicators of the preliminary selection,the final construction of the ecological environment evaluation index system of the tunnel engineering in the silt area of the sea reclamation is completed.Third,establish an ecological environment impact assessment model for tunnel projects in sea-reclaimed silt areas.Based on the determination of the evaluation method,the analytic hierarchy process and entropy method are used to determine the subjective and objective weights of the evaluation model,and the fuzzy comprehensive evaluation method is used to complete the quantification of the corresponding comment set,thereby constructing a cross-sea channel suitable for Shenzhen Mawan.A hierarchical model of ecological environment impact assessment of tunnel engineering.The evaluation results found that the impact of acoustic environment on the ecological environment is general;the atmospheric environment,water environment,thermal environment,and geological environment have little impact on the ecological environment of the reclaimed silt area;the water and soil environment has the least impact on the ecological environment;The construction of the tunnel project in the reclaimed silt area has less impact on the ecological environment.Finally,a comprehensive evaluation of the Shenzhen Mawan Cross-Sea Passage Project was carried out,and corresponding measures were put forward.The research results show that the evaluation model established in this paper has certain guidance and reference for the actual project’s ecological environment impact evaluation.