Foundation pit engineering usually refers to the construction site to build a set of foundation pit supporting structure system, forming the construction enclosure of underground engineering (also known as foundation pit enclosure structure), in order to smoothly carry out earth excavation and underground engineering construction.
First, the characteristics of foundation pit engineering
1,Foundation pit engineeringIt is a comprehensive discipline in geotechnical engineering
Foundation pit engineering is not only related to engineering geology, soil mechanics, the seepage theory, structural engineering design, construction technology and monitoring, at the same time, also involves the intersection of these disciplines, such as: the groundwater seepage of earth pressure, the influence of the soil mass stability: considering the interaction between soil and support structure of earth pressure size, the influence of the distribution form; The influence of different unloading and loading processes of soil on the supporting system; Space-time effect in foundation pit construction; The data of underground water level, earth pressure, deformation of support and support system are monitored and informationized. The influence of stress field, displacement field and groundwater level on surrounding environment caused by foundation pit engineering.
2, temporary and risky
In general, foundation pit support is a temporary measure. The safety reserve of the supporting structure is small and the risk is large. At the same time, the economic indicators of foundation pit engineering are particularly demanding, and sometimes even unreasonably low safety. However, deep foundation pit engineering in dense buildings in big cities requires strict environmental conditions, so the foundation pit engineering must be safe and reliable, and the cost of foundation pit engineering is often high,Therefore, the contradiction between temporary and economic indicators is prominent.
3,Foundation pit engineeringThere are large regional differences
Different geological conditions in different regions, such as engineering geology and hydrogeology in soft soil area and loess area, result in great differences in foundation pit engineering. There are also differences in different areas of the same city, so the design should be adapted to local conditions rather than simply copied.
4The environmental conditions around the foundation pit are strict
The adjacent tall buildings, underground structures, pipelines and subways have strict restrictions on the deformation caused by foundation pit excavation. The construction factors are complex and changeable, and the change of climate, season, surrounding water and other factors can lead to the change of environmental conditions around the foundation pit.
The above characteristics determine the complexity of foundation pit design and construction. Many uncertain factors easily lead to some conceptual errors in the design and construction of foundation pit engineering, which is the main cause of foundation pit accidents.
Second,Foundation pit engineeringThe function of the
The RETAINING structure OF FOUNDATION pit should ensure the safety of rock AND soil excavation and underground construction, and make the surrounding environment not damaged. Therefore, the retaining structure of foundation pit must have the following three functions.
1Foundation pit supporting structure should play the role of retaining soil, which is a necessary condition for earthwork excavation and underground structure construction.
2And control groundwater. The foundation pit supporting system can effectively control groundwater through water interception, water stop, precipitation and drainage to ensure that the foundation pit construction is carried out above the groundwater level.
3And in theFoundation pit engineeringDuring the whole process of construction, the deformation of the foundation pit and its surrounding soil should be strictly controlled to ensure that the environment around the foundation pit is not damaged, and the adjacent buildings, underground structures, pipelines and other corresponding facilities around the foundation pit are not adversely affected by their normal use.
Three,Foundation pit engineeringDesign requirements of
Foundation pit design shall include the following contents and design requirements:
1, support structure system and groundwater control scheme selection;
2Foundation pit stability checking;
3And calculation of bearing capacity and deformation of supporting structure;
4, environmental impact analysis and protection design;
5, groundwater control design;
6, earthwork excavation requirements;
7, safety monitoring requirements for foundation pit engineering;
8, support structure quality inspection, inspection requirements.
Shanghai Qiangqiang Foundation Engineering Co., LTD. 's business covers foundation pit engineering, pile foundation engineering, land and waterFoundation treatment, slope treatment and other engineering fields. Around" Excellent technology, reliable process", construction fast "technical requirements,Is to provide customers with land, water foundation engineering technical consultation, construction services and other comprehensive solutions of the entity enterprise.Contact Number: 400-100-2850