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1. Classification of foundation pit engineering According to the provisions of GB 50202-2002 in accordance with the provisions of GB 50202-2002, it is one of the following conditions:
(1) the important part of the main structure or the supporting structure;
(2) The excavation depth is greater than 10m;
(3) Foundation pits within a depth of excavation from adjacent buildings and important facilities;
(4) There are historical relics in the area of ​​foundation pits, such as historical relics, modern excellent buildings, and important pipelines that need to be strictly protected.
The three-level foundation pit is a foundation pit with an excavation depth of less than 7 m and the surrounding environment element is particularly required. The foundation pits except the first and third stages are secondary pits.
2. Safety level of the side wall of the foundation pit According to the depth of the foundation pit excavation, the surrounding environmental conditions and the severity of the damage of the supporting structure, the safety level of the side wall of the foundation pit is divided into three levels. See Table 1G420114-1 for details.
(1) the important part of the main structure or the supporting structure;
(2) The excavation depth is greater than 10m;
(3) Foundation pits within a depth of excavation from adjacent buildings and important facilities;
(4) There are historical relics in the area of ​​foundation pits, such as historical relics, modern excellent buildings, and important pipelines that need to be strictly protected.
The three-level foundation pit is a foundation pit with an excavation depth of less than 7 m and the surrounding environment element is particularly required. The foundation pits except the first and third stages are secondary pits.
2. Safety level of the side wall of the foundation pit According to the depth of the foundation pit excavation, the surrounding environmental conditions and the severity of the damage of the supporting structure, the safety level of the side wall of the foundation pit is divided into three levels. See Table 1G420114-1 for details.
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