With the continuous development of economy and society, the requirements for building structure and quality are also constantly improving. At the same time, foundation pit engineering is also developing in the direction of large span, depth and area, which increases the difficulty of slope support of deep foundation pit.
2. The construction period of deep foundation pit slope support is long.
Compared with conventional construction projects, the construction time of deep foundation pit slope is longer. It often takes several months from earthwork excavation to the completion and acceptance of all underground construction projects. During this period, the materials piled around the foundation pit, soil, rainfall, vibration of construction machinery and other factors will have a certain impact on the stability of deep foundation pit support.
3. The slope support construction of deep foundation pit has great influence on the surrounding environment.
Due to underground construction, the slope of deep foundation pit has great influence on the nearby environment. Generally speaking, deep foundation pit engineering is mainly located in the main position of the municipal government. Due to the limited construction site, high requirements are put forward for the distance control of ancillary structures and the stability of the slope itself. If two deep foundation pit slopes are constructed at the same time, the mutual restriction and influence will be greater and the construction difficulty will increase.
4. The slope support construction of deep foundation pit has strong regional characteristics.
The hydrogeological conditions in different places are very different, even in the same city. Therefore, in the design and construction of deep foundation pit slope support, it is necessary to carefully investigate the surrounding hydrogeological conditions, pipelines and structures near the proposed project, and determine the support form and construction scheme on this basis.
5. It is closely related to earthwork excavation.
Deep foundation pit engineering is mainly composed of earthwork excavation and the design and construction of deep foundation pit slope support system. Whether the earthwork excavation construction is reasonable and scientific will have a very important impact on the support quality. Many projects show that unreasonable excavation method, sequence or speed have a great negative impact on the supporting system and the main structure, resulting in serious damage to the stability of the whole supporting project.
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