Rock Mechanics and Tunneling Design

Spent Nuclear Fuel Disposal Facility

The world’s first spent nuclear fuel disposal facility will be built in Olkiluoto, Eurajoki. Spent nuclear fuel is packaged in copper canisters that protect the fuel from mechanical stress for up to 100,000 years.

The disposal facility will be excavated to a depth of 400 meters in the bedrock of Olkiluoto and the disposal canisters will be placed in holes drilled in the disposal tunnels. The stable bedrock provides almost unchanging conditions for nuclear fuel and protects against surface temperature fluctuations.

Excavation work began in 2016 and final disposal of nuclear waste is scheduled to begin in the 2020s.

Watch how it looks like in the depth of 430 meters.

Tampere Central Wastewater Treatment Plant

Construction of the Tampere Central Wastewater Treatment Plant began in 2018 and is expected to be commissioned in 2024. The Tampere Central Wastewater Treatment Plant will be excavated in rock to create stale conditions for the operation of the treatment plant, so that treatment processes are not disturbed or slowed down due to weather variations.

The planned Central Wastewater Treatment Plant uses the latest treatment technologies in order to keep the discharge load on the lake to a minimum. The activated sludge process is supplemented by sand filtration and UV disinfection. The treated wastewater is led to Lake Pyhäjärvi by means of a tunnel excavated in the bedrock and a discharge pipe.

The progress of the excavation of the Tampere Central Wastewater Treatment Plant can be monitored through the environmental monitoring system, EMO (Environmental Monitoring Online), developed by Kalliotekniikka Consulting Engineers Oy.

In the design of the Tampere Central Wastewater Treatment Plant, special attention has been paid to a possible future expansion.

West Metro

The West Metro extension has been one of the most talked about projects in the Helsinki metropolitan area in recent years. The 21-kilometer-long West Metro extension, which includes 13 new stations, has provided work for many design offices.

Rockplan’s Juha Salmelainen was responsible for the principal design of the rock mechanics and tunneling (PS-KAT) for the Ruoholahti – Matinkylä section of the first phase, which was commissioned in 2017. The rock mechanics and tunneling design of the Ruoholahti – Keilaniemi section was the responsibility of the consulting consortium FKW, which consisted of Finnmap Infra, Kalliosuunnittelu Oy Rockplan Ltd and WSP Finland Oy.

In the second phase of the West Metro extension, the Matinkylä – Kivenlahti section, Rockplan is part of the consulting group Sigma and is responsible for the rock mechanics and tunneling design for the Kivenlahti metro station and the structural design for the Kaita station. The Sigma consulting group consists of Finnmap Infra Oy, Kalliosuunnittelu Oy Rockplan Ltd, WSP Finland Oy, Sipti Oy and Saanio & Riekkola Oy. Phase 2 traffic is scheduled to begin in 2023.

Sipoo Multipurpose Hall and Civil Defense Shelter

The 1,200-square-meter multipurpose hall and civil defense shelter in Sipoo was designed to be as spacious as possible, versatile and pleasant to use. The multipurpose hall was excavated in the center of Nikkilä to a depth of about 28 meters. If necessary, the multipurpose hall will be converted into a shelter for 1,800 people.

In normal use, the sports hall can be divided into four sections, one of which can be isolated with a sound-insulated partition curtain. During the day, the facilities are mainly used by schools, but the size of the hall is also sufficient for official floorball and handball matches. The viewing area has space for 250 people.

The multipurpose hall also has meeting rooms, a café and a gym.