"Two Geotextiles One Geomembrane" Utilized in the Construction of Wuhan Huoshenshan Hospital

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"Two Geotextiles One Geomembrane" Utilized in the Construction of Wuhan Huoshenshan Hospital

Mar 20, 2020

Geosynthetics and Two Big Members of Its Large Family


Both geotextile and geomembrane are two big members of the large family of geosynthetics. Geosynthetics is a new type of geotechnical engineering materials. It uses natural fibers or synthetic polymers as raw materials to make various types of geosynthetics. It is deployed inside the soil, on the surface, or between layers of soil to perform functions of separation, filtration, drainage, seepage prevention, reinforcement and protection. In order to solve the problems of geotechnical engineering structure stability, deformation, seepage and drainage, geosynthetics are widely applied in railway, highway, water conservancy, electric power, construction, seaport, mining, military industry, environmental protection and other national construction fields. Geosynthetics include geogrids, geocells, geotextiles, geomembranes, geodrainage materials, geonets, geotechnical sand protection materials, geothermal insulation materials and related geotechnical composite materials, etc. They are well known internationally and are called the "fourth largest building material" after steel, cement, and wood.

Wuhan Huoshenshan Hospital: a temporary hospital for COVID-2019 infectious treatment
Wuhan Caidian Huoshenshan Hospital is based on the model of Beijing Xiaotangshan Hospital during the SARS fight in 2003. The total construction period of this hospital was 10 days. As a temporary hospital specializing in the treatment of infectious diseases, Huoshenshan Hospital must be ensured that all medical and domestic sewage and wastewater are drained by special pipelines. The hospital's sewage needs to be completely contained. It cannot penetrate into the ground or flow into the lake to avoid the spread of the virus.

Two Geotextiles and One Geomembrane Design as the Hospital's Impervious Structure
The project utilized a 20cm sand cushion layer + filament nonwoven geotextile + HDPE geomembrane + filament nonwoven geotextile + sand cushion layer to form an impervious structure. "Two geotextiles one geomembrane" refers to two layers of non-woven fabric and a geomembrane in the middle, which was equivalent to putting on a "protective raincoat" for the underground and surrounding environment of the hospital.

two geotextiles one geomembrane YINGFAN liners geotextiles in medical waste landfill

Geotextiles, also known as geotechnical textiles, are permeable geosynthetics made from synthetic polymer fibers. They are divided into woven geotextiles and non-woven geotextiles. Woven geotextiles are weaved from fiber yarns or filaments in a certain direction. Non-woven geotextiles are made of short fibers or filaments in a random or oriented array of thin batts, which are mechanically bonded, thermally bonded, or chemically bonded.

The "two geotextiles one geomembrane" applied in the construction of Huoshenshan Hospital is the laying of geotextiles, geomembrane, and geotextiles in sequence onsite. Among this design, the geotextile was a 600gsm filament nonwoven geotextile and the geomembrane was a two sides smooth or textured HDPE geomembrane with a thickness of 2.0 mm. The join of two geotextiles adopts the overlap method, and the join of the geomembrane adopts the welding method.

If geomembrane is deployed directly in the soil layer with sharp particles, they may damage the geomembrane. Therefore, when deploying a geomembrane, it is necessary to lay a geotextile or a sand cushion on the top and bottom of the geomembrane respectively to block sharp particles in the soil and protect the geomembrane.