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Protezione contro frane e colate detritiche - Kaikōura SR11 2023

SR11 shallow landslide barrier in December 2023

Protezione contro frane e colate detritiche - Kaikōura SR11 2023

SR11 SL-150 at completion November 2017

Protezione contro frane e colate detritiche - Kaikōura SR11 2023

SR11 looking upslope after March 2023 landslide

Protezione contro frane e colate detritiche - Kaikōura SR11 2023

SR11 from above: Note no impact on road and large 10 m³ boulder

Protezione contro frane e colate detritiche - Kaikōura SR11 2023

SR11 Looking South after 2023 landslide

Protezione contro frane e colate detritiche - Kaikōura SR11 2023

SR11 Looking North after 2023 landslide

Protezione contro frane e colate detritiche - Kaikōura SR11 2023

Looking North - Screenshots from scaling video showing 1 m³ rock impacting filled barrier

Protezione contro frane e colate detritiche - Kaikōura SR11 2023

SL-150 barrier after clearing and maintenance

Protezione contro frane e colate detritiche - Kaikōura SR11 2023

SR11 Looking North SH1 – 2023 post clearing

 

Sistemi

 

Anno di installazione

2023

Situazione iniziale

The 2016 Kaikōura M7.8 Earthquake caused widespread damage to the road and rail corridor some 20km North and South of the Kaikōura town ship. Over 40 major slips inundated the road and rail with over 750,000 m³ of material from source zones up to 500 m above sea level. The highly fractured Greywacke meant future landslides were expected, creating a requirement to install shallow landslide barriers in several SH1 and Rail locations. To date (2023), six SL150 barriers have been installed along the corridor. The SL150 barrier at the SR11 site required steeper upslope anchors to avoid interaction with the rail tunnel and also a rockface connection at Northern end. The barrier is 3.5 m high and 48 m long (6 x 8 m fields).

In March 2023, heavy rainfall triggered a large 600 m³ landslide at the SR11 site. Since the SL150 barrier installation (2017), only smaller 300 – 400 mm rocks had released and impacted the system. The landslide was comprised of a mixture of soil, gravels, vegetation and large blocks. The largest block was › 10 m³ and came to rest against the fourth post (South-North). The barrier was filled to approximately 0.5 m from the top in the centre two fields and had 1.25 - 1.5 m elongation, just touching the roadside barrier. Overall, the barrier performed exceptionally well.

Descrizione

The initial response was to spread some of the debris behind the barrier to create extra catchment capacity and prevent overtopping in the event of the head scarp regressing further. Rock Control were then mobilised to clear and reinstate the barrier, which took five shifts.

First, a top-down scaling campaign was conducted, realising further blocks into the filled barrier. The largest block was approximately 1 m³, which was successfully stopped by the barrier. An excavator from roadside then removed 600 m³ of debris, with a rock breaker required for the largest block prior to removal. Rock Control then carried out maintenance on the barrier, which required one post, two upslope brake rings and two mesh panels. The SL150 barrier is now back and ready for action.

Paese / Regione

Nuova Zelanda

Progettazione:

North Canterbury Transport Infrastructure Rebuild (NCTIR) Alliance

Contraente:

SRG Install - Rock Control Maintenance

Oggetto protetto

Strada

Protezione dalla corrosione

GEOBRUGG SUPERCOATING

Il contatto locale

René Müller
   

René Müller

Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

Sistemi contro il dissesto idrogeologico
Ingegneria idraulica
Miniera / Gallerie
Geobrugg AG,Industriestrasse 21,5200 Brugg / Svizzera Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

E-mail

Olivia Sartorius
   

Olivia Sartorius

Sistemi contro il dissesto idrogeologico
Ingegneria idraulica
Miniera / Gallerie
Geobrugg AG

E-mail

Alexander Bittendorfer
   

Alexander Bittendorfer

Project Manager Inspection Services

Sistemi contro il dissesto idrogeologico
Geobrugg AG,Trucks via road 14 or 13 only!, Aachstrasse 11,8590 Romanshorn / Svizzera Project Manager Inspection Services

E-mail

Isacco Toffoletto
   

Isacco Toffoletto

Sistemi contro il dissesto idrogeologico
Ingegneria idraulica
Miniera / Gallerie
Geobrugg AG Ticino,Via Brusada 5,6933 Muzzano / Svizzera

E-mail