In seepage control projects—such as those involving underground structures, artificial lakes, and landfills—how can the persistent challenge of leakage be resolved both efficiently and durably? As a specialized manufacturer in the field of geosynthetics, Shandong Hongyue Environmental Engineering Co., Ltd. (hereinafter referred to as “Hongyue Environmental”) has leveraged its extensive expertise in Geosynthetic Clay Liners (GCLs) to formulate a scientifically rigorous and standardized construction protocol. Through four core steps—”subgrade preparation, scientific installation, precise overlapping, and timely backfilling”—this protocol fully harnesses the unique advantages of GCLs, specifically their ability to “swell upon contact with water and self-heal,” thereby establishing an impenetrable waterproof barrier for a wide range of engineering projects.
Step One: Rigorous Subgrade Preparation—Laying a Smooth and Stable Foundation
The quality of the subgrade directly determines the effectiveness of the GCL installation. Hongyue Environmental’s technical team emphasizes that the subgrade surface must undergo strict preparation prior to construction. First, the subgrade must be compacted and leveled; specifically, the flatness ratio (defined as the ratio of the maximum depth of any depression to its minimum diameter) must not exceed 1:6, and all transitions must be gradual, strictly prohibiting the presence of sharp features such as right angles. Second, the subgrade surface must be kept clean, with a thorough removal of all sharp debris—including grass roots, gravel larger than 10 mm in diameter, and brick fragments—to prevent the outer woven fabric layer of the GCL from being punctured during installation. Furthermore, while GCLs can be installed on damp subgrades, the accumulation of standing water on the surface is strictly prohibited; in instances where uncontrollable flowing water is encountered, temporary diversion measures must be implemented in advance to ensure the work surface remains in optimal condition.
Step Two: Standardized Installation and Anchoring—Ensuring a Tight and Secure Fit
During the installation phase, Hongyue Environmental recommends precisely pre-cutting the GCLs according to the project dimensions; the liners may be laid out either transversely or longitudinally. During construction, the GCL is unrolled flat onto the prepared subgrade, typically positioned with the woven fabric layer facing the ground and the non-woven geotextile layer facing upward. To ensure intimate contact between the GCL and the subgrade, specialized anchor pins and washers must be utilized for secure fastening; additionally, the edges of the liner should be weighted down with sandbags to prevent displacement caused by wind. Technical experts emphasize that extreme caution must be exercised during the installation process. It is strictly prohibited for heavy machinery to drive directly over the blanket surface. Workers walking on the material should wear flat-soled shoes to prevent sharp objects from puncturing the internal impermeable membrane (in the case of membrane-laminated waterproof blankets) or damaging the outer geotextile layer, either of which would disrupt the uniform distribution of the bentonite.
Step 3: Meticulous Overlap Treatment—Constructing a Continuous Impermeable Layer
Joint treatment is the critical factor determining the success or failure of the entire impermeable system. Hongyue Environmental’s construction specifications mandate that the overlap width between adjacent waterproof blankets must be maintained at a minimum of 25 cm to 30 cm. Within the overlap zone, a specialized dry bentonite powder (or bentonite paste)—provided by the company—must be applied uniformly. The standard application rate is typically controlled at approximately 0.4 kg/m² to ensure that, upon contact with water, the joint forms a continuous, dense, gel-like waterproof layer. To further seal the overlaps, the powder application can be supplemented with specialized waterproof tape, ensuring that every detail is fail-safe and creating a seamless, continuous impermeable barrier.
Step 4: Timely Layered Backfilling—Providing Long-Term Protection
Once the waterproof blankets have been laid, the protective layer construction or backfilling process must commence as soon as possible. This prevents the blankets from drying out and losing their effectiveness due to prolonged exposure to air, or from prematurely swelling if exposed to rainfall. Hongyue Environmental places particular emphasis on the quality requirements for backfill soil: the soil must be screened to strictly exclude hard objects—such as gravel or brick fragments—with a particle size exceeding 10 mm. During construction, clean soil or fine sand should be used for layered backfilling and compaction; each layer’s thickness should be controlled within a range of 30 cm to 50 cm, and the compaction density must reach at least 85%. This process not only shields the waterproof blankets from external mechanical damage but also utilizes the pressure exerted by the soil mass to further enhance the overall stability of the impermeable layer.
Leveraging this standardized “Four-Step Construction Method,” Shandong Hongyue Environmental’s bentonite waterproof blankets are able to fully demonstrate their core advantages: high resistance to hydrostatic pressure (exceeding 1.0 MPa), strong self-healing capabilities (capable of repairing cracks up to 2 mm in size), as well as excellent aging resistance and eco-friendly properties. From material production to on-site technical guidance, Hongyue Environmental Protection is steadfastly committed to providing clients with integrated anti-seepage solutions, utilizing professional expertise and rigorous processes to ensure that every project remains absolutely watertight.
Post time: May-07-2026
