TOP STORY

Shallow Landslide Treatment Project, Ba Deo Park, Ha Long City, Vietnam

Background
An entertainment park was built on the top of Ba Deo Mountain, Ha long city. The slope below has been covered by a layer of complete weathered and fractured sandstone which is very unstable and easy to slide off after any heavy rainfall. And the bottom of slope here is just adjacent to the residential habitation and will cause debris flow when every heavy rain eroding the slope surface, and this is greatly threatened the safety and property to the residents below the slope.

Problem

Because of the poor geological and drainage condition of the surrounding area, the slope is particularly at risk from landslides. Such situation not only endangered the park on the top, but also seriously affected the residential safety at the toe of slope. In 2018, a significant landslide up to 20 m wide and 20m long occurred after some days of torrential rain. So, the owner called for an immediate rehabilitation to stabilize the slope, and also required the completed structure should be durable, aesthetic, and eco-friendly to the surrounding environment after rehabilitation.

Design& Construction

A base layer consisted of mixed seeds, fertilizer, and water-bearing material was hydro-sprayed on the slope surface, and the surface was then covered by ACEMat™ R which is manufactured by polymer yarns with the three-dimensional texture structure, and can closely integrated the soil and fertilizer together to support vegetation. Finally, 3D diamond-shaped steel wire mesh was then fixed together with ACEMat™ R by using grouted ACENail™ SD Soil Nails. Combined with this is the drainage ditch system to prevent runoff and seepage, surface soil eroded by the rainfall can be avoided more effectively, and then stabilize the shallow slope!

Result
After construction, the composite protection system for shallow slope sliding treatment completely secures the vulnerable slope. Thanks to the ACEMat™ R, the surface was well-vegetated; this was not only good in regard to the aesthetic consideration but also performed erosion control well. In addition, ACEMat™ R with the flexibility characteristic can be adapted to the local terrain condition and be installed easily. The design of this composite slope protection system with ACEMat™ R totally meets the demands of the eco-friendly to the neighbor environment.