CANTERA ZIORDIA

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Dynamic Rockfall Barriers

2021

ZIORDIA - NAVARRA - España

Cantera de Ziordia

Inaccés GeotÚcnica Vertical

CRS IngenierĂ­a

CANTERA ZIORDIA

Problema

The Ziordia quarry has an orography formed by limestone rock, with steep slopes as a result of quarrying, and potentially unstable large blocks. The company CRS IngenierĂ­a contacted Bianchini Ingeniero to analyse the situation and possible solutions, and subsequently the company InaccĂ©s GeotĂšcnica Vertical also intervened. One of the main risks was the blocks that could fall from a 40-metre-high, 15-metre-wide mochĂłn, located on one of the quarry’s usual passageways. This represented a potential risk for the installations and the workers themselves. Therefore, a series of actions were carried out to stabilise these blocks and protect the area.

Solução

To secure the area, two types of actions were carried out: 1. An active solution to prevent the larger blocks from being mobilised. This system consists of: – ICAF 44 double cable flexible anchors, which fix the unstable blocks to the part of the rock massif that is sound. – HEA 300×300-10 cable net, a cable net with a wire knot of very high resistance and rigidity, which retains the unstable blocks as a girdle. – Steel cables, which distribute the tensions of the cable net to the flexible anchors embedded in the ground. 2. In addition, a passive solution, consisting of: – A dynamic barrier RB 3000, 6m high and 150m long. The function of this barrier is to stop the smaller blocks that could fall so that they do not affect the quarry installations. Both the HEA 300-8 cable net and the dynamic barrier have CE marking and full-scale tests in accordance with current regulations, which guarantees their performance.

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