Research On Safety Control Of Qingdao Haitian Deep Foundation Pit Excavation

With the continuous development of our economy and the advancing of urbanization,the use of underground space is the main way to solve the urban construction land,so the scale of underground engineering is more and more big,the deep foundation pit engineering also gradually increase,due to the deep foundation pit engineering construction scale,long construction period,construction difficulty is high,the influence factors is complex,etc.Cause and frequent safety accidents in deep foundation pit engineering construction,not only caused serious casualties and economic damage to property,it also brings serious social negative influence,so the study of deep foundation pit engineering construction safety risk,the decomposition of deep foundation pit engineering construction procedure and risk,found that influence the key risk factors of deep foundation pit engineering construction and establish the excavation of the deep foundation pit engineering safety risk evaluation system,strengthen the deep foundation pit excavation in the process of construction safety risk control,to prevent the happening of the risk of accidents and ensure the safety of the project of deep foundation pit excavation has important practical significance.This article is based on the theory of risk identification,through the work decomposition method and the excavation work of deep foundation pit project risk decomposition thinning and risk,may exist in the process of excavation of deep foundation pit project safety risk factors for identification and classification,recognition and sums up the 24 to generate safety accidents caused by deep foundation pit engineering of the key factors,and establish the safety evaluation index system and level Settings.In the aspect of the study on the safety risk analysis of deep foundation pit construction,the method of combination weighting is adopted to weight each risk index,which makes the weight determination more objective and accurate.The qualitative problems are quantified by fuzzy comprehensive analysis method,and the risk value is calculated scientifically,so that the analysis results are more intuitive and reliable.In this paper,by way of case evaluation analysis of Qingdao Haitian deep foundation pit engineering project,this paper introduces the basic engineering of Qingdao Haitian engineering general situation,using the proposed research train of thought,through thestudy of the main conclusions are as follows: first,clear the identification of risk factors in the process of deep foundation excavation method,combining with the domestic and foreign research situation of deep foundation pit,based on the principle of "4 m1e" to the risk of decomposition process of deep foundation pit excavation,the engineering data accessed by the expert scoring method,and through the work breakdown and risk decomposition,the deep foundation pit engineering is decomposed into three benchmark index layer,nine indicators and 24 secondary indicators.Secondly,through the analytic hierarchy process(ahp),the combined weighting method combining subjective and objective weighting methods is adopted to assign weights to each index,and the evaluation system of deep foundation pit is established,and the comprehensive fuzzy analysis method is adopted to evaluate the construction safety risk level of deep foundation pit.Carry on the quantitative analysis to each risk event,get the risk degree of each risk event.Determine the project each risk factor weight and calculate the risk level,with a larger risk factor of foundation pit deformation of foundation pit by Flac3 d numerical simulation and monitoring,the results show that the simulation results with the actual monitoring results in line with,the evaluation system can be accurate analysis of the key risk factors and the evaluation results,can provide effective theory basis for the risk control.After the introduction of fuzzy mathematics and AHP can be scientific and objective analysis of the degree of risk the risk events,by combining the method determine the weight of risk factors,make the results more objective,in the construction phase before application of the methods for engineering risk analysis,project risk can be recognized science is simple,and can undertake risk aversion by technical method,reduce the possibility of occurrence of a risk,reduce casualties and economic losses,property at the same time improve the reference data for similar projectsThere are 34 pictures,59 tables and 75 references in this paper.