Ultimate Guide To Choosing Composite Liner System

Composite liner system is widely utilized across various civil engineering fields, including water conservancy, municipal infrastructure, construction, transportation, subways, and tunnels. In water conservancy projects, composite geomembrane liner plays a crucial role in anti-seepage treatment for dams and channels, ensuring structural stability, enhancing safety, and minimizing water loss and soil erosion. Additionally, BPM Geosynthetics composite liner system is extensively applied in waste containment sites, artificial lakes, river embankments, landscape lakes, and other projects, providing reliable solutions for seepage prevention, protection, reinforcement, drainage, and isolation.

1. What Is Composite Liner System?

The composite liner system consists of geotextile and geomembrane, providing excellent anti-seepage performance and weather resistance. Manufacturers typically use one or more layers of geotextile, such as needle-punched or woven geotextile. They then tightly bond it with a geomembrane layer, like polyethylene or polyvinyl chloride.

To ensure durability, they apply thermal or adhesive compounding processes for a secure combination. This advanced construction enhances impermeability and extends the system’s lifespan.

2. What Are Functions Of Composite Liner System?

2.1 Anti-seepage effect:

The composite liner system primarily prevents water leakage by using a plastic film to block seepage channels in earth dams. Engineers often apply it to water conservancy projects, including dams, reservoirs, and canals, for effective anti-seepage treatment.

Additionally, they use it for anti-seepage isolation in environmental projects, such as landfills and sewage treatment plants. This reliable system enhances water conservation and environmental protection.

2.2 Isolation and reinforcement effect:

The composite liner system effectively separates soil layers or materials to prevent mixing and adverse interactions. Engineers use it to reinforce soil, enhancing its tensile strength and deformation resistance.

Additionally, it protects the soil from erosion, ensuring long-term stability. This versatile system improves both structural integrity and environmental sustainability.

2.3 Protection effect:

Engineers use the composite liner system as slope protection to stabilize river embankments and riverbeds in water conservancy projects. It also prevents soil erosion caused by chemicals, acids, alkalis, and salts.

Additionally, it safeguards soil quality and helps preserve the ecological environment. This durable system enhances both structural stability and environmental protection.

2.4 Drainage and anti-filtration effect:

The geotextile in the composite geomembrane provides excellent drainage, quickly removing excess water from the soil. Additionally, it acts as a filter, preventing soil particles from washing away.

By maintaining soil stability, it helps enhance the durability of engineering structures. This dual function improves both drainage efficiency and long-term performance.

2.5 Strong ability to adapt to deformation:

The Composite Liner System has a large tensile strength and elongation, and can withstand water pressure and adapt to dam deformation.

This makes it widely used in water conservancy projects and other occasions that need to withstand greater pressure and deformation.

3. How to choosing Composite Liner System?

Composite Liner System is a material widely used in water conservancy, environmental protection and other fields for anti-seepage, isolation and other functions. The following points should be noted when purchasing:

• Material: Composite Liner Systemare divided into three materials: HDPE (high-density polyethylene), LLDPE (linear low-density polyethylene) and LDPE (low-density polyethylene). HDPE has the best anti-seepage performance and is the most commonly used.
• Size: Before purchasing, measure the area to be covered or isolated, and choose a large geomembrane as much as possible to reduce problems at the joints.
• Tensile strength: Select tensile strength according to needs, usually longitudinal and transverse, and choose appropriate strength according to actual use.
• Confirm the reputation of the manufacturer: The manufacturer of composite geomembranes should have a certain scale and strength, and ensure that the products meet national standards and various technical requirements.

The following aspects should be considered when selecting a Composite Liner System:

• Impermeability requirements: Determine the required impermeability level according to the type of liquid to be prevented. Some special liquids such as chemicals and oils require the use of corresponding special membrane materials.
• The nature of the soil layer:Engineers must analyze the soil type, layer thickness, and stability before selecting a composite liner system. They also evaluate pollution levels to determine the appropriate membrane thickness and tensile strength.By considering these factors, they ensure optimal performance and durability. This careful selection process enhances project effectiveness and long-term reliability.
• Construction environment: Factors such as the location of the building, the surrounding environment, and surrounding facilities will also affect the selection of composite geomembranes.
• Economy: Consider flexibility and durability comprehensively and choose a more economical and practical membrane material.

4. Construction method

• Quality inspection of composite geomembrane materials.
• Cleaning and leveling the embankment slope, removing all sharp corners and debris, backfilling and compacting the slope, cutting and leveling the slope, and passing the inspection and acceptance by the supervisor to provide a working surface for laying the composite geomembrane.
• To simplify construction and ensure splicing quality, workers should use the widest possible composite geomembrane. Before installation, they must cut it according to the site’s dimensions. Then, they should splice it into appropriately sized blocks for easy handling.Next, they need to roll the spliced geomembrane onto steel pipes for efficient transportation. Finally, workers should manually carry it to the working surface and lay it properly.

Laying method of composite geomembrane:

• The laying of composite geomembrane is divided into two parts: channel bottom laying and slope surface laying. Laying method: horizontal rolling along the channel axis. After the slope surface is accepted, it is rolled along the slope axis, and the composite geomembrane at the bottom of the channel is connected with a T-shaped connection.
• Technical requirements for laying of composite geomembrane:Workers should lay the composite geomembrane in dry, warm weather for optimal results. To ensure proper splicing and reduce stress, they should use a wavy relaxation method with 1.5% redundancy. After spreading, they must promptly flatten and pull it open to maintain a smooth surface. Additionally, the geomembrane should fit the slope tightly without visible wrinkles.

  To prevent damage, workers must wear flat cloth or soft rubber shoes during installation. They should avoid spiked shoes, as these can puncture the geomembrane. If any damage occurs, they must repair it immediately to ensure structural integrity.

During transportation, do not drag or pull the composite geomembrane hard to avoid stabbing with sharp objects.

• It should extend from the bottom to the high position, do not pull too tight, and leave a margin of 1.50% to prepare for local sinking and stretching. Considering the actual situation of this project, the slope is laid from top to bottom;
• The longitudinal joints of two adjacent sections should not be on the same horizontal line, but should be staggered by more than 1m;
• The longitudinal joints should be more than 1.50m away from the dam foot and the bend foot, and should be set on the plane;
• The slope is laid first and then the bottom of the field;
• When laying the slope, the film spreading direction should be basically parallel to the maximum slope line.

5.Summary

When selecting Composite Liner System, the specific needs and environmental conditions of the project should be fully considered to ensure that the selected model can meet the project requirements.

When purchasing Composite Liner System, you should choose products produced by regular manufacturers and check relevant documents such as product quality certificates and inspection reports to ensure that the product quality is reliable.The Best Project Material Co.,Ltd focuses on the production of Composite Liner System and one-stop services, and is a very reliable choice.During the construction process, the construction should be carried out strictly in accordance with relevant specifications and standards to ensure the correct laying and fixing of the Composite Liner System to give full play to its protective and reinforcement functions.