Expressway Construction Cases

　　In road engineering construction, the surface treatment of the base layer is very important. In many cases, composite geomembranes are laid on the base or bottom surface to ensure that the road is not damaged by the underground soil layer. Composite geomembrane is a type of geomembrane composed of polymer membrane and geotextile. It has the characteristics of geomembrane and geotextile. Here, the role of composite geomembranes in road engineering was analyzed, hoping to help everyone better understand this material.

　　1、 The Role of Composite Geomembrane in Road Engineering

　　1. Isolation effect

　　Placing composite geomembranes between two different material development methods, between different particle sizes of the same research material, or between the soil surface and the structural design of the upper construction enterprise can simultaneously isolate them. When the road surface is subjected to external environmental loads, although these materials are mainly subjected to stress analysis and compression, the separation of composite geomembranes in the middle prevents them from mixing or losing each other, It can maintain the overall economic structure and function of road foundation materials on its own, and is widely used in China's railway, highway subgrade, earth and rock dam engineering, soft soil foundation data processing and other engineering projects.

　　2. Protective effect

　　Composite geomembranes can play a role in dispersing stress. When external forces are transmitted from one object to another, they can decompose stress and prevent external forces from damaging the soil, thus providing protection for road materials. The main protective function of composite geomembrane is to protect the internal contact surface, that is, when a material is subjected to concentrated stress, it is placed between two materials without damaging the other material.

　　3. Reinforcement effect

　　Composite geomembranes have high tensile strength, and when buried in soil or road surface for structural design and appropriate adjustment of position, they can mainly distribute and manage stress in soil or road surface structures, transmit tensile stress, limit their lateral horizontal displacement, enhance their frictional resistance with the development of construction materials in soil or road structure layers, and continuously improve the strength of soil or road surface structure layers and geomaterials to form composite structures, This effectively constrains the shape of the soil or pavement structure layer, suppresses or reduces the uneven settlement of the soil, and enhances the stability of the soil or pavement structure layer with reinforcement function.

　　Composite geomembranes play various roles in road engineering, but they play different primary and secondary roles in different engineering positions. The general isolation effect between the crushed stone base and the highway foundation is primary, followed by protection and reinforcement. When building highways on weak foundations, the reinforcement of composite geomembranes can play a role in controlling the soil mass.