Plastic Drainage plate ，Is composed of an extruded plastic core board and a non-woven geotextile wrapped around its two sides. The core plate is the skeleton and channel of the drainage belt, and its cross section is parallel cross-shaped, which can guide the water flow. The geotextile on both sides can play a filtering role to prevent soil particles from blocking the drainage channel.
1、The working principle of plastic drainage board is mainly based on its unique vertical drainage channel design. In soft soil foundation treatment, the plastic drainage board is vertically inserted into the soft soil layer through the board inserting machine, which can form a series of continuous drainage channels. These channels are connected to the upper bedded sand layer or horizontal plastic drain pipes to form a complete drainage system. When the preloading load is applied to the upper part, the void water in the soft soil foundation is discharged into the sand layer or horizontal drainage pipe laid on the upper part through the channel of the plastic drainage board under the action of pressure, and finally discharged from other places. This process accelerates the consolidation of the soft foundation and improves the bearing capacity and stability of the foundation.
2、The plastic drainage board has very good water filtration and smooth drainage, as well as very good strength and ductility, and can adapt to the deformation of the foundation without affecting the drainage performance. Moreover, the cross-section size of the drainage board is small, and the disturbance to the foundation is small, so the insertion board construction can be carried out on ultra-soft foundation. Therefore, it also has very good drainage effect under complex geological conditions.
3、In engineering, the working effect of plastic drainage board will be affected by many factors.
（1）The insertion depth and spacing of drainage boards should be reasonably arranged according to the foundation conditions and design requirements. Too shallow insertion depth or too large spacing may lead to poor drainage.
（2）The setting of the upper bedded sand layer or horizontal drain pipe is also important. They have very good water permeability and stability to ensure the efficient operation of the drainage system
（3）Quality control during construction is also a key factor affecting the drainage effect. Including the installation elevation, installation speed, return length, etc. of the drainage board, all need to be strictly controlled to ensure the integrity of the drainage board and the smooth flow of the drainage channel.
However, the working principle of plastic drainage board is also related to the choice of its material. The core board is generally made of polypropylene ( PP） And polyethylene ( PE） It has the rigidity of polypropylene and the flexibility and weather resistance of polyethylene. Therefore, the drainage board not only has sufficient strength, but also can maintain stable performance under harsh environmental conditions. When choosing geotextile, it is also necessary to consider its filtration performance and durability to ensure the long-term smooth flow of the drainage channel.
Post time: Jan-13-2025
