Study On Dynamic Programming Of Foundation Pit Excavation

The process of earthwork excavation is very important in excavation engineering.especially in these deep excavation that the excavated area is large,the excavated shape is irregular,and surroundings around excavations is complex.Excavation is a process that constantly changing with time and space.Results caused by excavation is not only related to the completion status,is also closely related to excavation process.So there is a issue in the process of excavation.And the issue is how to optimize excavation parameters in dynamic construction mechanics.This article introduced a new method that is include the response surface and the enumeration.Under the condition of the existing wall supporting system,using the new method to optimize excavation parameters for the plan of excavation is the shortest.The research contents are as follows:(1)At present a lot of deep foundation pit that is located in the bustling city centre areas.And it is common that taking the connect wall supporting scheme to control the deformation and protect the environment.For this kind of foundation pit that always use connect wall to supporting,the excavation parameters of two-dimensional profile can be analyzed separately by the differences of normal construction method and inverse method.(2)Introducing a new method that is include the response surface method and the enumeration method.And using the new method to optimize excavation parameters of two-dimensional profile for the plan of excavation is the shortest.At the same time,studying how to use the new method.Firstly,the planning model of excavation parameters is established.And then the response surface-enumeration method is adopted to plan the excavation parameters.(3)Taking the project of LANDMARK in Kunming as an example to select the two-dimensional section for detailed research.According to the working condition divided the range of excavation on the two-dimensional section.And the excavated area can be divided into B excavation and C excavation.B excavation takes normal construction method.However,C excavation takes inverse method.Then the two foundation pit are taken as the research object,to verify the feasibility and effectiveness of the response surface-enumeration method.