Deep foundation support is a kind of temporary structure, which is mainly used in the initial stage of construction and is an important section of the construction process. Deep foundation support is closely related to underground pipeline construction, road construction, and foundation construction. So before applying deep foundation support technology, it is necessary to set it up in strict accordance with the relevant protection requirements, do preliminary investigation work and optimize the existing construction process. At present, in the construction of deep foundation support, there are the following common difficulties.
Structural Design is More Difficult
Safety is the focus of foundation support structure design. The safety performance of the deep foundation support structure is closely related to the soil pressure. However, the geological conditions of most high-rise buildings are relatively complex. Many parameters need to be considered when designing deep foundation support schemes. It is necessary to ensure that the physical force parameters of the ground meet the relevant requirements before carrying out subsequent design and construction. Among them, water content, and internal friction angle are key parameters in the design of deep foundation support structures, but the specific values of these parameters are also hard to confirm, which increases the difficulty of the calculation of deep foundation support structures.Difficult to Confirm the Foundation Soil
The foundation soil quality in the construction area is closely related to the quality of the support structure. The coverage area of most high-rise building projects is relatively large. When the construction unit investigates the soil quality of the construction area, in most cases, it will choose the form of sampling analysis. This means that the soil sampling results may not reflect the real geological conditions of the whole construction area, and there may be problems that the design of deep foundation support does not meet the geological conditions of the construction area.Serious Excavation Space Effect
During the construction process, the construction unit often encounters the problem of horizontal displacement around the foundation to the inside. This problem will cause the phenomenon that the middle of the foundation is larger than the two sides, which will reduce the stability of the side slope of the foundation. The construction quality of the support has a certain impact, which reflects the serious space effect problem after the development of the deep foundation.Deficiency in Force Calculations
Most designers will use the limit equilibrium theory to determine the safety factor and calculate the support structure parameters. Although this calculation method can effectively guarantee the safety performance of the deep foundation support structure, it will increase the construction cost, which is not suitable for the deep foundation support of high-rise building engineering relevant application requirements.
The deep foundation support structure is an important part of high-rise building construction and has a close relationship with the building’s quality performance.
The construction unit should pay attention to the requirements of the deep foundation support technology and the common problems in the construction process, in order to improve the construction quality and ensure construction safety.