Before foundation pit earthwork excavation, the earthwork excavation construction plan should be compiled and measured according to the requirements of foundation pit design for each construction stage. The main contents of the earthwork excavation construction plan generally include project overview and characteristics, geological survey data, surrounding environment,Foundation pit supporting Design, construction layout and traffic organization, excavation machinery selection, excavation conditions, excavation methods, drainage measures, seasonal construction measures, support deformation control and environmental protection measures, monitoring schemes, safety technical measures and emergency plans, etc., the construction scheme shall go through the examination and approval procedures in accordance with relevant regulations.

The EARTHwork excavation of foundation pit can be reasonably stratified in depth range, reasonably divided into blocks on the plane, and the sequence of each block excavation can make full use of the resistance ability of the unexcavated part of soil, effectively control the soil displacement, so as to achieve the purpose of reducing the foundation deformation and protecting the surrounding environment.

If the excavation depth of soft soil foundation pit is too large or asymmetric and unbalanced, the local soil in the foundation pit may be unstable and slide, resulting in the deviation of column piles and foundation piles. In addition, the rheological characteristics of the soft soil are obvious-- After depth, deformation will increase with exposure time. Therefore, the soft soil layerThe foundation pit The support Settings should be propped before digging and as quickly as possible ,Try to shorten the unsupported time in each step of excavation.

Earthwork excavation shall be carried out step by step. The requirements of the depth of excavation step by step shall be carried out according to the provisions of the design working conditions, and overexcavation is strictly prohibited. Earthwork excavation can be divided into open excavation method and dark excavation method, dark excavation method generally refers to the use of reverse method, cover excavation and other construction technology of the foundation pit excavation.

In the process of earthwork excavation, with the gradual increase of the excavation depth,Foundation pit supportingThe transposition of the structure also increases gradually. The engineering practice shows that the development of the deformation of the supporting body around the foundation pit is related to the order of earth excavation in the pit. Usually, the deformation of the supporting body on the side of the foundation pit where the earth is excavated first is larger than that on the opposite side when the earth is excavated later. Therefore, the side of the earth with strict environmental protection requirements should be excavated later.

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