| Huangcaoping tunnel lies in high earthquake intensity ofâ…¨degree seismic area, it is very close to deep activity rupture zone (about 300 to 400 m), which is really rare at home and abroad, and became a representative engineering in tunnel construction history, thereby caused the apprehension to its safety.In order to grasp the safety state of Hcaoping tunnel after building up, so that take the corresponding measures, it is very essential that carry on study and evaluation of the aseismatic safety on the completed tunnel. Meanwhile, the research results can be the good guidance for the aseismatic design and construction.Aim for the need of the tunnel evaluation at present, the index system of aseismatic safety evaluation was established by using method of comprehensive research means combined by geological survey, field monitoring test, indoor physical modeling test as well as numerical simulation analysis, the comprehensive evaluation model was established by using the method of fuzzy mathematics. Finally, Huangcaoping tunnel was evaluated by using the fuzzy comprehensive evaluation modle established. Following the works, acquire the understanding and results in the below:1. Analyzing geological conditions of Huangcaoping Tunnel in detail, and summarizing the main fracture activity as well as site seismic dynamic characteristics around the location district of the tunnel. Studying and classifying the data of earthquake damages of tunnels at home and abroad, analyzing the destroy forms and the influencing factors of earthquake damages of mountain tunnels, according to all this, the index of tunnel aseismatic safety evaluation was established.2. Presented the means by using the ideas and the methods of safety system engineering to tunnel safety evaluation, expatiated the basic content of the safety system engineering and safety evaluation, introduced the analysis procedure and calculate measures of multi-factor fuzzy comprehensive evaluation.3. Established aseismatic safety evaluation index system of mountain tunnel, it contains four important aspects of geological conditions, the situation of design and construction, earthquake and it dynamic effects, and the stress state of tunnel structures. Every aspect of the four has its secondary-level factors. Analyzed and expatiated the influence of every factor on tunnel aseismatic safety in detail. 4. Established fuzzy comprehensive evaluation model of tunnel aseismatic safety by using AHP and fuzzy comprehensive evaluation method. It is secondary-level of Fuzzy comprehensive evaluation model, AHP was used for the weight calculation of evaluation factors.5. Calculated and evaluated the aseismatic safety of Huangcaoping Tunnel No.2 by using established evaluation model. The evaluation results indicated that the aseismatic safety of the opening section is in the danger state, the section of shallow-buried is in relatively safe state. The result is according with the actual environment of the tunnel, and according with the research law for the earthquake disaster of underground structures too. It validated the rationality of the evaluation method and model. |
PDF Full Text Request