Posted by: Marc Hendrickx | November 9, 2014

RMS Slope Risk Analysis Training

We have been acting as the lead trainers for RMS Guide to Slope Risk Analysis Ver. 4 training since 2012 (Marc has been involved with the slopes program since the early 2000s). Accreditation for completion of training is through courses conducted by NSW Roads and Maritime Services.

Contact Marc to discuss your training needs.

Posted by: Marc Hendrickx | August 25, 2014

Slope remedial works Summerland Way

Marchgeo provided design and supervison for cutting rehab works on the Summerland Way north of Kyogle in August. The video below just one of a number of large rocks removed. Risk now down to ARL4!

Posted by: Marc Hendrickx | June 4, 2014

International Rockfall Protection Conference 2014

Marc attended the International Rockfall Protection Conference 2014 hosted by Geobrugg in Switzerland and Austria over May 21 to 28, 2014. The conference included a field test of Geobrugg’s 500kJ flexible rockfall protection canopy at their testing facility in Wallenstadt. Following technical talks a tour was held of remedial sites in Switzerland, Austria and Southern Germany. Among the numerous installations visited was the large rock fall canopy along the spectacular Route des Pontes, in the Canton of Valais:Image

The tour provided invaluable information about state of the art slope remedial works.

Posted by: Marc Hendrickx | April 9, 2014

Clyde Mountain works continue

Marc is involved in the second stage works at Clyde Mountain. an interesting and challenging site. RMS providing updates via the following website:

Marking up works in the 1993 slide area

Marking up works in the 1993 slide area

Posted by: Marc Hendrickx | September 26, 2013

Slope Stability 2013

Slope Stability 2013 will provide a forum for open pit mining and civil engineering practitioners, consultants, researchers and suppliers worldwide to exchange views on best practice and state-of-the-art slope technologies. Best practice with respect to pit slope investigations, design, implementation and performance monitoring will be discussed during the symposium.

The ACG is delighted to host this symposium in Brisbane for the first time. Past symposia have been held in Vancouver, Canada, 2011; Santiago, Chile, 2009; Perth, Australia, 2007; and Cape Town, South Africa, 2006.


We are attending this Friday

Posted by: Marc Hendrickx | June 14, 2013

Clyde Mountain Stabilisation works

We are currently assisting RMS with slope stabilisation works at Clyde Mountain on the Kings Highway. The area has a long history of landslides driven by a coincidence of road geometry and bedding. Widening works in the late 1950s undercut bedding dipping steeply into the road way leading to the current problems. Failures occurred during widening (1959-about 30,000m3), in 1993 (about 5,000m3) and last year (April 2012-about 1000m3).

1993 slide BW

Kings Highway, Clyde Mountain. Landslide of 28/10/1993. From front page of The Canberra TImes 30/10/1993



Marc Hendrickx assessing potential planar rock slide west flank of 1993 landslide. This material was successfully removed by machine scaling.


More information about the project available through the RMS website.


Posted by: Marc Hendrickx | May 22, 2013

New Slope Risk Analysis Page added

We have added a new SRA page that will be expanded to include more detail about our SRA, and slope risk management capabilities  Marc Hendrickx and Associates are the best choice for independent advice on slope risk management.

Posted by: Marc Hendrickx | February 21, 2013

Welcome to 2013

A belated welcome to 2013. Here’s a great landslide video…


Posted by: Marc Hendrickx | November 16, 2012

Christmas New Year period

We wish all our clients a Merry Christmas and Happy New Year!

If you are unable to contact Marc by phone between 5/1/2013 and 24/1/2013 try email: marchgeo at gmail dot com

Posted by: Marc Hendrickx | September 14, 2012

NSW RMS Geotechnical Conference

Marc Hendrickx presenting at RMS Geotechnical Conference, North Sydney, 12/9/2012

Marc Hendrickx presented at the 2012 RMS Geotechnical  Conference. The title of Marc’s paper was “Management of small rock falls on the F3 Freeway”.

We’ll post a link to the presentation as soon as RMS put them up on their technical pages.

Here’s the Abstract:


The Sydney-Newcastle Freeway (F3) is a major transport corridor linking Sydney with the Central Coast, Newcastle and Northern NSW. Between Kariong and Wahroonga the freeway passes through spectacular rock cuttings up to 50 m high in Hawkesbury Sandstone. These remarkable engineering structures were constructed by drill and blast methods in the late 1960s. The height, steep design with an absence of benches and narrow carriageway configuration has left an ongoing legacy of regular maintenance and inspection to reduce the risks of rock falls impacting the carriageway.

Qualitative slope risk analysis, using the latest version of RMS Guide to Slope Risk Analysis version 4, rates many of these higher slopes (Slopes >18m height) as high risk (~ARL2) for a direct impact from a small (<0.2m diameter) rock fall. A quantitative risk analysis (QRA) was undertaken as an independent check on the results. The QRA integrated estimates of rock fall frequency based on observations, the results of rock fall modelling software to assess potential rock fall trajectories and their probability of impacting the carriageway for different cut heights and geometries; along with traffic counts and assessed vulnerabilities, as a means of assessing the risk to life. The QRA confirmed the outcome of the Qualitative Risk Analysis. The results were combined with earlier qualitative assessments of the cuttings undertaken under ver 3.1 of the RTA’s Guide to Slope Risk Analysis to provide an overall risk to life.

Current management practises in involve periodic (10-15years) devegetation, scaling and stabilisation of any larger rock fall hazards using passive rock dowels or shotcrete. The costs of this work are high and do little to affect the long term risk of small rock falls which re-emerge overtime as vegetation re-establishes and rocks erode as they are exposed to the weather. Rock fall mesh is installed on a number of cuttings on the F3. A comparative cost analysis was undertaken to assess the cost of installing mesh on high cuttings on the F3 south of the Hawkesbury River. The cost was found to be competitive with current management practises and has the added benefit of maintaining slope risk levels at acceptable levels over time.

Taking questions, Chris Walker Senior Geotechnical Scientist at left

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