Research On Construction Risk Identification And Control Management Of Shield Tunneling Through High-weight Buildings In Lanzhou Rail Transit

According to the planning and construction of urban rail transit,rail transit is necessary for normal production and life of the urban core during construction of all kinds of different degrees of negative effects,compared with other construction types,rail transit has the construction scale big social influence period is longer than the restricting factors commonly more money into big characteristics,combined with the engineering construction safety risk hidden danger itself,moreover many complicated conditions with surrounding the construction environment,urban rail transit construction of each link of risk control and management is very important.Because most of urban rail transit construction in urban areas,and the surrounding environment,such as pipe road building,etc.)had a greater influence on the mutual restriction especially shield through building area,affected by the formation damage precipitation engineering construction disturbance,inevitably affect the underground architectural structures,such as ground subsidence building cracking inclination,side wear are relative,or even collapse of shield tunneling construction process in the local or near crossing through the building,this way to effect more apparent and the uneven settlement of foundation,the risk is bigger Therefore,it is of great significance to study the risk control of shield tunneling through important buildings.This article first discusses the based on the risk side of shield in the important buildings to study the significance and necessity of further research the risk management of rail transit project risk project risk management of shield risk management research achievements both at home and abroad and the existing status quo,through comparing the subway shield through both at home and abroad research building,the instance of content as well as the safety accidents can be obtained,the subway shield interval through the existing building,risk management and control of the depth and breadth of also is not comprehensive,still exist due to the project characteristic regional restriction The diverse surrounding environment leads to the lack of universality in the application of risk management,the lack of close combination between theoretical research and practical engineering,the lack of system ativeness in the risk control system for shield tunnelings through important buildings,and the insufficient breadth and depth of research.On the basis of discussing and studying,this article studies the direction and the main content,formed the basic technical route,and then according to the basic theory of risk management mechanism according to the basic theory of risk management principle and method of engineering project risk management analysis method,and the corresponding risk control to the construction of shield tunnel crossing major construction whole process of in-depth research,analyzed the risk characteristics of rail transit construction and basic management process.Through the basic process of risk management,the risk identification,evaluation,control and monitoring of shield tunneling through the building are analyzed.Among them,identification is a process of comprehensively sorting out the possible risks in the implementation,which is the foundation of risk management.The evaluation is to conduct quantitative or qualitative analysis of identified risks,determine the level and importance of risks,and provide support for the proposal of targeted control measures.In the process of evaluation,the corresponding risk calculation model is established according to the theory of comprehensive AHP.To test and verify the feasibility of the model at the same time,with the first phase of lanzhou urban rail transit line 2 side wear a certain interval near high building for the engineering case,the area between the construction process will be through the shopping malls and other places of dense,which has strong reference significance,is to use risk management model is set up in advance,to verify the rationality of the calculation model and practical In the process of risk management and control,case for interval shield side wear near high heavy buildings related to construction and monitoring data,using expert questionnaire form risk source list,and establish corresponding risk calculation model,using the analytic hierarchy process(ahp)level of risk calculation,it is concluded that the overall risk of engineering index and the most important control factors in this paper,taking method for integrating the optimized evaluation model,the model of calculation and evaluation is the basis of the optimization.According to the assessment of the overall risk index,in view of the buried depth of tunnel adjacent tunnel shield construction itself space position,combined with the influence of surrounding the project construction,municipal roads and all kinds of buried pipelines,etc,we consider the protection of the adjacent buildings and other facilities and protection measures,combined with the project engineering hydrogeology process risk analysis and the calculation method in other peripheral environment,possibility of a comprehensive evaluation of the risk level and risk loss level,and aiming at all kinds of risks,determine the corresponding measures of scientific monitoring technical solution process Legal and economic measures were taken to deal with the risks,and specific suggestions were put forward for specific project management,such as selecting a reasonable tool change position by strengthening the pre-grouting in key parts of the hole detection in advance,and paying attention to scientific monitoring measurement and response.In theoretical research,on the basis of case analysis,this paper summarizes the case regional restriction,etc.,at the same time as engineering background paper for the next step still need further study and discussed,such as the use of evaluation method for the comprehensive risk identification,on the basis of comprehensive evaluation,using expert scoring and hierarchical analysis of the existing risk assessment methods are optimized and adjusted,but still belongs to the more traditional way with the continuous development of technology,can provide reference for future will be more and more visual information case,intelligent real-time monitoring of cloud computing The Internet of Things and other advanced technologies are more developed,which provides a possibility for further control and research on major risk sources of rail transit shield construction.In general,this paper make full use of the results,possibility of a comprehensive evaluation of the risk level and risk loss level,this paper established the risk evaluation model can reasonably concluded that urban rail transit in a reliable way of shield side wear near high building level and loss of the key risk factors,the pluralism of multi-objective complex problem to comb and simplify the lanzhou city rail transit line no.2 side wear heavy buildings in shield construction the finalize the design analysis and the quantitative evaluation of the risk,determine the risk factors of importance for decision makers and management control method to provide technical basis.