Research On Safety Risk Control Technology And Its Applicationin Beijing Metro Approaching Construction

Based on lots of Beijing Metro Approaching Construction case,Using field research,data collection,theoretical analysis,numerical calculation and measurement methods,Researching construction partition,formation deformation law,risk management and control technology measures,Achieved the following main results:(1)The main adverse geological processes in Beijing subway construction are seepage failure and foundation pit water gushing,tunnel water gushing,etc;The environment risk mainly including across a large number of building concentration areas,underground pipeline,,railway,municipal bridge sand the water,etc.Achieved the geological factors,environmental factors,construction risk factors of Beijing subway.(2)Put forward the quantitative description of underground engineering and the surrounding environment proximity or mutual influence degree of nearness and partition concepts,presents a different method of close degree and extent of engineering standards;According to the importance of the engineering environment,security(vulnerability)and the relative position of the relationship between engineering and engineering environment gives the construction method of environmental risk level,considering its own risk and environment risk engineering comprehensive risk classification method is put forward.(3)Underground engineering construction of stratum deformation model is established,which can forecast strata deformation.Divides Beijing Metro approaching construction assessment into three stages:the early stage of engineering construction,the project implementation stage and After the work stage.Put forward the construction risk assessment method,in detail elaborated the purpose,content,process of three stages.(4)From the structure reinforcement,stratum reinforcement and isolation,reduce the construction disturbance to control risk.Based on displacement distribution principle,Put forward construction of stages of fine control method;Gives the risk management process monitoring process,monitoring project should according the principle of "division,classification and grading" to formulate monitoring measurement standard,and according to yellow,orange and red three early warning management and control.(5)Combined with mining method,shield tunnel method,open pit method emergency excavation events,detailed analysis and researching the risk characteristics of various emergency excavation events,presents corresponding prevention measures and emergency treatment measures for each incident.(6)Apply risk identification,risk assessment and risk control methods on an engineering example,The monitoring data of structure and the steel rail is normal for the whole process of construction,achieved good results.