Study On Support Design And Stability Of Deep Foundation Pit In Han-wei Scheduling Management Center

With the rapid development of China's economic construction,the height and density of urban architecture are increasing.Limited by urban space,deep foundation pit works can be seen everywhere.With the gradual increase of building height,the depth of foundation pit is also increasing gradually.The soil nailing wall and pile-anchor structure are widely used in the slope support of deep foundation pit because of their reasonable load and economic advantages,which provide guarantee for the safety of life and property of the construction personnel and the surrounding personnel.However,due to the complexity and uniqueness of deep foundation pit engineering,the collapse accident of foundation pit slope happens frequently.It is necessary to conduct in-depth research on the soil nailing wall and pile-anchor support,explore their force and protection mechanism,and better guarantee the safety of foundation pit slope.Based on the foundation pit project of han-wei-dispatch management center in Shanxi province,this paper expounds the construction technical requirements,construction plan,construction technology and safety measures of the foundation pit excavation.Based on the foundation pit construction scheme,the finite element numerical model of foundation pit slope is established to simulate the deformation and safety and stability of foundation pit slope under the design and construction scheme,study the protective effect of foundation pit supporting mode,and provide technical support for foundation pit slope supporting.On this basis,the foundation pit construction organization and safety measures are discussed in depth.The main research contents and achievements of this paper are as follows: firstly,in view of the characteristics of foundation pit construction and surrounding environment of han-wei-dispatch management center project,specific technical requirements and guarantee measures are put forward,and the foundation pit construction plan is prepared to ensure the safety and timely completion of foundation pit construction.Secondly,according to the surrounding environment conditions of foundation pit in this project,the foundation pit supporting scheme and construction technology were compiled,and the specific foundation pit supporting mode and construction technology process were studied to ensure the safety and stability of foundation pit supporting.Thirdly,based on the foundation pit support scheme,the finite element numerical model of the foundation pit slope is established to simulate the deformation and safety stability of the foundation pit under the design scheme.Meanwhile,the deformation and safety stability under the non-adopted support scheme are simulated.The protective effect of the support scheme is obtained through comparative analysis.Fourthly,according to the characteristics of foundation pit construction in this project,specific construction organization and safeguard measures,technical measures and emergency plan are proposed,which lays a foundation for the emergency treatment of foundation pit construction.