Geotechnical Monitoring of the Eppenberg Tunnel++


Geotechnical monitoring




Work started in 2015 on the Eppenberg Tunnel, Soleura canton (Switzerland), which will have a length of 3,114 meters and will be finished in 2020. It will link the towns of Aarau and Olten in order to de-congest the traffic on one of the most transited railway routes in the country, used by 550 trains every day. The building of an infrastructure of this type requires permanent and reliable geotechnical monitoring to detect any incident that may affect the works. This is achieved by means of the Loadsensing wireless monitoring system that Worldsensing has supplied to Terra Monitoring AG.


Loadsensing enables Terra Monitoring AG, one of the leading monitoring companies in Switzerland, to gather the readings of the geotechnical instruments used in the Eppenberg Tunnel works. The remote monitoring system is formed by 55 load anchors and 5 extensometers, which are controlled with a central gateway from outside the tunnel. The sensors’ wireless operation and low consumption has provided a minimum-impact solution that guarantees that the system does not interfere with the construction work.


The robustness, flexibility, ease of expansion, low consumption and wide scope of the Loadsensing wireless solution have provided Terra Monitoring AG with a highly-efficient monitoring system in terms of data deployment and gathering. The sensors integrate optimally with the different types of geotechnical instruments used by the company to take measurements. Furthermore, automating the supervision based on the Loadsensing Software Suite has enabled Terra Monitoring AG to eliminate most manual readings and control, which involved the company’s staff having to travel out to the site to gather data. This also makes it possible to reduce the cost and the time dedicated to supervision tasks. Terra Monitoring AG’s experience with the Loadsensing monitoring system has been a resounding success as published in the prestigious engineering magazine Ernst & Sohn.

Geotechnical monitoring system with wireless sensors

The building of the Eppenberg railway tunnel, which links the cities of Aarau and Olten, incorporates Loadsensing G6 wireless sensors. This solution provides the company responsible for supervising the works with automatic control of the geotechnical instruments.


– Automated supervision of construction.
– Low-consumption wireless sensor system.
– Perfect integration with the geotechnical instruments.
– Optimum real-time control of the infrastructure.
– Cost-saving by avoiding on-site reading of instruments.

Loadsensing is very easy to use. It’s a bit like ‘plug and play’. You attach the node next to the load cell, connect the cable(s) to the node, do a quick configuration and that’s it.

I think the most important benefit is the wireless connection, in combination with the long range and the low-power consumption. This cable free product is a great facilitator for sustained locations like tunneling sites.

In addition, the long lasting battery life makes Loadsensing perfect for installing nodes on very remote spots, for example rocks, where you would usually need a professional climber to reach the place.

To sum it up, with Loadsensing I don’t have to install cables – I don’t even want to think about installing cables. It must be a nightmare on a rapidly changing site like this – and I don’t have to change batteries every couple of weeks.

E. J., Terra AG

Geotechnical Monitoring of the Eppenberg Tunnel

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