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Category Archives: Rockfall Protection

As one of Australia”s experienced difficult access specialists, Specialised Geo team are well-trained in the latest techniques for stabilising environments. One of the challenging projects that we had successfully completed was the highwall stabilisation work at Wollongong, NSW.

Our team utilises its expertise in high wall stabilisation by employing the latest techniques and state-of-the-art equipment for stabilising hazardous environments and inhospitable sites.

This project was completed on time and on budget. We have compiled some of the photos in a video format below.

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Specialised Geo will be attending Maccaferri’s 3-day International Rockfall Technical Workshop in Belluno, Italy from October 8th to 10th, 2013. The workshop will cover topics on Rockfall protection and natural hazard mitigation and will be attended by around 240 engineering and mining professionals from around the world.

Specialised Geo will be represented by its Chief-Executive-Officer Rachel Metcalf and Managing Director Leigh Henness.

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After a week”s time off to give way to the rally race that finished on Sunday, Specialised Geo is now back to work at the Eastern Dorrigo Way to fix two more landslip sites in the area. The road remediation work on a 1.2 km site on the downhill side of the Eastern Dorrigo Way was awarded to the team in 2012 by the Coffs Harbour City Council in consultation with the Regional Geotechnical Services.

The project aims to use slope stabilisation techniques to counter the effects of erosion in sections of roads in 6 major sites within the area ,and to decrease if not to alleviate, disruption to local traffic.

Of the four sites that have been completed, Specialised Geo considered the works on Site 3 as challenging but manageable. With the team”s expertise, cantilevered retaining wall and various technical processes were utilised to complete the works in this site, including a footing and 3 lifts, of note just under 650 tonne of backfill aggregate.

DTH and TOP hammer drilling practices and methodical approach were applied by the Specialised Geo team in Sites 1, 2 and 3. In Site 3, the team used self sacrificing drill bits and self grouting, serious drill. Grout meters were also obtained. Down-the-hole drilling was a steady process and anchors were manually installed and grouted. For this work, the team used 32 and 38mm anchors, hollow steel and glass fibre anchors, Une fois que la roulette est place filature, la petite balle est lancee a partir de la direction de la roue. negating the use of Tremmie or grout lines secured to the bar. An adaptor that was made up in the Specialised Geo work shop was used to insert the grout. Kwik spacers were used on the bar.

Specialised Geo”s past experiences were well-utilised in Site 2 as well, where it used a pre-made grout mix from Holcim and had to impress upon them a pristine bowl. The method used was very efficient, very quick and cost-effective, and a standard practice considering the remoteness of the area.

The work, although very physical and demanding in nature, is considered by the Specialised Geo team as the least demanding of all its works

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because it goes into building good working and consulting relationship with the Coffs Harbour City Council, the Regional Geo Consultancy, Traffic management and the Mid Coast Traffic Services, which provided the plans for all excavation and extreme single lane situations.

Specialised Geo team is aiming to complete the works on two more sites in 1 to 2 months.

Take a peek into some of the images of the Specialised Geo team in action…

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Unstable rock surfaces and environments are a reality in most construction and mining environments.  When a rock fall occurs in the mine site, it is almost impossible for the people to take evasive actions to avoid injury or to save their lives.  Hence,  rockfall protection is one of the most significant aspects of the mining site operation, and without it, no mines can ever operate.  Among the commonly used RPS in the mine site are nets and meshes made of hybrid steel wires because they are not only economical and easy to install, but they have also been tested to stop the most extreme impact energies and can cope with different threat scenarios in the mining site.

So how are meshes and cable nets used to control rockfall?

catch-fence-specialisedgeoThe nets and meshes serve as shields that control detached rocks from raveling down to the bottom. They are designed to hold the falling rocks or direct them to a catchment area at bottom of the slope. The mesh or nets can be attached to anchors at the top only or can be secured at both top and bottom.

Which is better?

Drapery systems or draped mesh or nets, and anchored mesh/nets are the most common structures that are used in the mine sites. Drapery systems are used to contain rockfall that occur beneath the mesh or net and control the descent of detached material from falling at the bottom of the slope. They are designed to protect against raveling-type  rockfall that involves small-volume slope failures or blocks. They can also be used on both uniform and highly irregular slopes, and are not limited to a distinct rock/slope material type.

On the other hand, anchored mesh systems are designed to put pressure to the rock or slope to reduce rock movement by using rock anchors and wire mesh. The wire mesh is tensioned into the anchors specifically to apply active retention force to retain rocks and soil on a slope.

The potential hazards brought by rock fall in mine sites are reduced by the continuous development and production of innovative rockfall protection and barrier systems not only in compliance to the safety standards in the mining environment but also to ensure that the people working in the mining site are always safe and protected.

 

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