The section of foundation pit refers to the support from the axis of changing contour to the edge of foundation pit.

The foundation trench profile refers to the support from the changed contour axis to the edge of the foundation pit, and the relevant contents are as follows:

The section of foundation pit refers to the shape and change of supporting structure at the edge of foundation pit in civil engineering construction. In civil engineering, the design and construction of foundation trench profile is very important, because it is directly related to the stability, construction progress and safety of foundation pit. When designing the section of foundation pit, it is necessary to comprehensively consider geological conditions, soil characteristics, surrounding buildings and underground facilities to ensure the stability and safety of the supporting structure at the edge of foundation pit. The following will introduce the design and key points of the base groove in detail.

First of all, the profile design of foundation trench needs to fully understand the engineering geological conditions. Under different geological conditions, the profile design of foundation trench will be different. For example, in hard rock, the supporting structure of foundation trench can be relatively simple, while in soft soil, it may be necessary to adopt more complex supporting structures, such as steel support and soil nailing wall. Therefore, when designing the foundation trench profile, it is necessary to conduct detailed geological investigation to understand the groundwater level, soil layer distribution and stratum stability, so as to select the appropriate supporting structure.

Secondly, the influence of surrounding buildings and underground facilities should be considered in the profile design of foundation trench. If there are existing buildings or underground pipelines around the foundation trench, the influence should be fully considered in the design to avoid the damage to the surrounding buildings or underground facilities caused by excavation and supporting structure construction during the construction. When designing the foundation trench section, it is usually necessary to carry out on-site survey to obtain the accurate position and depth information of surrounding buildings and underground facilities, so as to reasonably determine the position and shape of the foundation trench section.

In addition, the stability of foundation pit supporting structure should be fully considered in the design of foundation pit section. The supporting structure of foundation pit usually includes deep foundation pit supporting, soil nailing wall, cantilever wall and so on. These structures need to be designed according to the depth of foundation trench, soil characteristics and geological conditions.

When designing the section of foundation pit, it is necessary to determine the type, size and layout of supporting structure to ensure the stability and safety of foundation pit during construction and use. In the design, the bearing capacity, deformation characteristics and seismic performance of the supporting structure are usually considered in order to choose the appropriate supporting scheme.

Finally, the design of foundation trench section also needs to consider the construction technology and construction progress. The section design of the foundation trench should match the actual construction technology to ensure the smooth progress of the construction process. When designing the section of foundation trench, we should fully consider the construction equipment and methods to avoid the problems of great construction difficulty and long construction period. In addition, the construction sequence should be arranged reasonably to ensure that the foundation pit supporting structure can be constructed smoothly according to the design requirements, and to avoid engineering quality problems caused by construction schedule delay.

To sum up, the profile design of foundation pit is a very important link in civil engineering, which is related to the stability, construction progress and safety of foundation pit. When designing the section of foundation pit, we should fully consider the influence of geological conditions, surrounding buildings and underground facilities, determine the appropriate supporting structure type and size, and ensure the stability and safety of foundation pit during construction and use.

At the same time, the construction technology and progress should be considered to ensure the smooth construction of foundation pit supporting structure and avoid problems in the construction process. Only by making full consideration and preparation in these aspects can we ensure the smooth implementation of the foundation trench profile design and ensure the quality and safety of the project.