PfotBction DEBRIS STOP 200-HM Protection Barrier against Spontaneous PFEIFER ISOFER AGShallow Landslides hasentalstrasse 8 CH-8934 KNONAU TELEFON +41 (0)44-7685555 E-MAIL [email protected] INTERNET www.pfeifer-isofer.ch

The rising risk of debris flows According to PLANAT, 6  of all Swiss territory could potentially % be affected by the threat of landslides. As a result of global climate change and the associated increase in heavy precipitation, landslides on steep slopes are likely to become more frequent. An increase in such events must therefore be anticipated in the future. Spontaneous, shallow landslides and debris flows, in which vegetation is sliding together with the water-saturated topsoil, are a highly dynamic process. Once in motion, the mixture of stones, wood, soil, vegetation and water flows downhill...

Protection concept: Effective protection against debris flows Our ISOSTOP rockfall barriers have performed against numerous landslides and showed impressively the protection they offer against hillslides. PFEIFER Isofer subsequently developed an optimised debris flow system that was successfully tested in a 1:1 scale test in summer 2012. The Debris Stop 200-HM system consists of hinged mounted HE pillars supported by retaining ropes, brake elements, upper and lower support ropes and a net known as the FLEXNET. Brakes on the support ropes and post heads ensure that energy is dissipated as required....

The new patented FLEXNET is characterized by a high energy absorbtion and also a high flexibility. Impacted by a debris flow the FLEXNET provides the draining of the debris material and minimizes the load on the system. Break element The key element of the DEBRIS STOP system is the brake element with linear course of force along the entire brake path. Its simple construction and the low weight allow an easy handling. PATENTED Net attachment For cable-protecting sliding of the net on support cables and faster installation, the net of the Debris stop barrier are fixed by shackles. In case of maintenance,...

The proof of a high absorption capacity The DEBRIS STOP 200-HM system has demonstrated its impressive capacity against shallow landslides by means of comprehensive testing in 1:1 scale. Using a test site specially developed for this experiment, a total of 50 m³ of debris flow material with a density of approx. 1,900 kg/m³ was poured down a slide with a length of 55 m. The test system was built on a steep slope (in excess of 40°) with the aim of achieving a speed similar to that of debris flows at 10 m/s. Another typical characteristic of debris flows is the sudden release of the sliding mass....

Test results The test results illustrate the key characteristics of a debris flow. It was noticed that, due to material drainage, internal friction in the net increases as it traps the sliding mass and leads to the formation of a wedge of earth that reduces the dynamic load on the contact front. This behaviour is demonstrated in particular by the level of force existing on the retaining ropes, where high load values can only be observed at the beginning of the filling process. The Debris Stop 200-HM contains brake elements and the FLEXNET to reduce this impact stress. During the test, the FLEXNET...

PFEIFER ISOFER DEBRIS STOP 200-HM - Protection Barrier against Spontaneous Shallow Landslides

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