Research On The Safety Risk Of Masonry Structure Buildings Along The Tunnel

As a traditional architecture, Masonry structure has been extensively adopted in China. However, its resistance is not high. Masonry structure often suffers from the impact of constructions of urban rail transition like tunnel. Actually, large numbers of problems like cracking and collapse and even social disputes have been extensively reported in recent years. Those problems are mainly caused by the tunnel construction. Based on these facts, it is significant to undertake research t o understand the safety risk of masonry buildings near the tunnel, which can potentially avoid serious accidents and ensure the safety of residents. This thesis is tackling this problem, by conducting theoretical research and engineering survey based on the CZT intercity rail projects.Firstly, the characteristics of masonry structure, a common failure modes and features will be described and followed by the mechanism of the tunnel’s influence, the characteristics of building reactions.Secondly, deep research and analysis of existing risk in masonry buildings has been carried out. By analyzing present situation of the existing building management, the practical significance of evaluation of existing risk is introduced. A basic assessment system according to WBS-RBS basic principles has been developed and a unified index rating and evaluation standards has been established based on the basis of “civil Reliability Qualification Standards” GB50292-1999 and other studies. The attitudes of residents about the risks are obtained through interviews, and the basic principles of existing risk have been established.This thesis focused on the potential safety risk of masonry buildings brought by tunneling. A new safety risk evaluation system which is suitable for masonry buildings near the tunnel is proposed in the paper. It combined the advantages of the risk index method and risk matrix method. The risk factors are identified and described on the basis of the actual investigative work and literature review. And then, based on the mechanism of interaction between the bu ilding and the tunnel, weight distribution and assignment of the factors is implemented by AHP-Entropy method. The proposed method has been evaluated in CZT intercity rail projects. Based on the evaluation, a more realistic criteria of risk grade by revising the previous one has been presented. The verification results showed that the evaluation system meet the requirements of practical work. Finally, a case of application of the proposed method is introduced.At last, risk response measures of masonry buildings along the tunnel and evaluation of the risk consequences has been analyzed. The principles of risk response and specific methods are described in details. The process of risk monitoring, the principles of monitoring and warning are introduced. At the end, this thesis gave methods to evaluate the results of risks and suggestions about how to deal with them.