The stability and bearing capacity of the foundation are crucial factors in construction projects, especially when constructing on soft soil foundations, the application of foundation reinforcement technology is particularly critical. Grouting technology, as an effective means of foundation reinforcement, improves soil properties and improves the bearing capacity and stability of the foundation by injecting specific slurry into the foundation. This article will introduce three common grouting technologies in detail: static pressure grouting, high-pressure jet grouting and composite grouting, and explore their principles, application fields and advantages.
1. Static pressure grouting: split grouting method for foundation reinforcement
Static pressure grouting, also known as split grouting, is mainly used in house construction projects on soft soil foundations. Its principle is to use pressure to inject cement slurry or cement mortar with a larger specific gravity into the foundation. Under the action of pressure, the slurry splits and extends along the minimum principal stress surface or weak stress distribution area in the foundation stress field to form an irregular condensate, squeeze and compact the surrounding soil, reduce soil voids, and increase compression modulus. The slurry condensate plays a skeleton role in the soil, significantly improving the bearing capacity of the foundation while reducing the possibility of settlement and deformation.
2. High-pressure jet grouting method: a pioneer in reinforcement in multiple fields
The high-pressure jet grouting method has been developed since the late 1960s and has been widely used in my country's construction industry, especially in the reinforcement of soft foundations of highways, the reinforcement of mine tunnels and the anti-leakage projects of water conservancy projects. With the acceleration of high-rise building and subway construction, the anti-leakage work of urban deep foundation pits is also increasingly using high-pressure jet grouting technology. This method forms a reinforcement body by high-pressure jetting slurry to enhance the stability of the foundation and is suitable for a variety of geological conditions.
3. Composite grouting method: an innovative technology for pile foundation reinforcement
The composite grouting method is a new reinforcement technology that combines the advantages of high-pressure rotary jet grouting and static pressure grouting, and is mainly used for pile foundation reinforcement. First, the high-pressure rotary jet grouting method is used to form the pile column, and then the static pressure grouting method is used to enhance the rotary jet effect, so that the reinforcement slurry gradually spreads, avoids the solidification and shrinkage of the slurry, and eliminates the grouting blind area. The composite grouting method has a wide range of applications. It can not only reinforce clay, sand and gravel layers, analytical sand layers and silt, but also effectively deal with karst soil caves, showing its strong adaptability under complex geological conditions.
As an important means of foundation reinforcement, the development and application of grouting technology has greatly promoted the technological progress of the construction industry. Static pressure grouting method, high-pressure jet grouting method and composite grouting method have their own characteristics and are suitable for different types of foundation reinforcement projects, providing strong technical support for improving foundation bearing capacity and ensuring the safety of construction projects. With the continuous innovation of technology, grouting technology will play a more important role in the field of foundation reinforcement in the future.