Tunnel Presentation. Tim Smart 27 th June 2016 P1509 (1) HOL/10014/0002
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1 Tunnel Presentation Tim Smart 27 th June 2016 P1509 (1) HOL/10014/0002
2 Tunnel Briefing Agenda 1. Operational aspects of tunnels (1) Safety arrangements (2) Noise and vibration (3) Vent shafts and smoke control (4) Energy use in tunnels 2. Construction (1) Tunnelling techniques (2) Shaft construction (3) Settlement (4) Construction aspects 3. Costs implications (1) Costs of tunnelling P1509 (2) 2 HOL/10014/0003
3 Tunnel Locations P (3) HOL/10014/0004
4 Tunnels Phase One Twin Bored Tunnel Cut & Cover Euston 7.4km London Clay Wendover 1.4km Chalk Northholt 14km London Clay/Lambeth/Chalk Greatworth 2.1km Glacial Till/Oolite/Whitby Mudstone Chilterns 15.8km Chalk Chipping Warden 2.5km Low Jurassic Marlstone/Mudstone Long Itchington Wood 1.5km Penarth Group/Mercia Mudstone Long Itchington Wood 0.4km Penarth Group/Mercia Mudstone Bromford 2.8km Penarth Group/Mercia Mudstone Burton Green 0.5km Lower Carboniferous Mudstone P1509 (4) 4 HOL/10014/0005
5 1. Operational Aspects of Tunnelling (1) Safety Arrangements (2) Noise and Vibration (3) Vent Shafts and Smoke Control (4) Energy use in Tunnels P (5) HOL/10014/0006
6 1.(1) Minimum Safety Requirements (TSI) Place of relative safety If to the surface every 1 km To adjacent independent tunnel tube every 500m Fire Fighting Points - Applies to all tunnels over 1 km and rolling stock dependent Tunnel Length 1 to 5 km at portals with minimum standing area 550 sq m Tunnels over 5km at every 5km depending on rolling stock characteristics Fire Fighting Point defined as Location inside or outside tunnel where fire fighting equipment can be used and passengers can evacuate Water Supply capacity is a minimum of 800 l/min for 2 hrs. P (6) HOL/10014/0007
7 1.(1) Tunnel Cross Passage P (7) HOL/10014/0008
8 1.(1) Emergency Train Evacuation P (8) HOL/10014/0009
9 1.(1) Evacuation Walkway & Tunnel Cross Passage Opening HS1 P (9) HOL/10014/0010
10 1.(1) Intervention Gap P (10) HOL/10014/0011
11 1. (2) Noise and Vibration P (11) HOL/10014/0012
12 1. (2) Vibration mitigation via booted sleeper track P (12) HOL/10014/0013
13 1. (2) Vent Shafts and Operational Noise HS2 vent shafts are designed, constructed operated and maintained along with their associated stationary equipment so that noise in the worst affected residential receptors conforms to British Standard guidance and achieves the aims of the Noise Policy Statement for England. Mechanical equipment within the vent shaft is only operated under the following circumstances; During and emergency During maintenance when required to maintain an acceptable air quality environment. During tunnel congestion when required to maintain an acceptable air quality environment. P (13) HOL/10014/0014
14 1.(3) Vent Shafts and Smoke Control Primary Purpose Smoke extract and control. Pressure relief Access for emergency services. Passenger comfort to keep air quality and temperature within acceptable limits. Secondary Uses Tunnel boring machine maintenance intervention. Access for railway maintenance. P (14) HOL/10014/0015
15 1.(3) Vent Shafts along Bored Tunnels P1509 (15) HOL/10014/0016
16 1. (4) Energy use in Tunnels Traction power Energy required for the traction power of the trains increases in tunnels. In the open air 80% of the energy used by the train goes into overcoming air resistance. This increases to 90% in a tunnel. Increased power for Mechanical and Electrical plant and equipment Increase in energy costs for the railway due to the plant necessary for safety arrangements (e.g fans, lifts, fire mains, emergency lighting plus tunnel integrity plant (e.g pumps, cooling arrangements) P (16) HOL/10014/0017
17 2. Construction (1) Tunnelling techniques (2) Shaft construction (3) Settlement (4) Construction aspects P (17) HOL/10014/0018
18 2.(1) Construction P (18) HOL/10014/0019
19 2.(1) Bored Tunnels Earth Pressure Balance Tunnel Boring Machine (EPBM) P (19) HOL/10014/0020
20 2.(1) Bored Tunnels HS1 EPBM in factory showing back up arrangements P1509 (20) 20 HOL/10014/0021
21 2.(1) Bored Tunnels Slurry or Hydroshield Tunnel Boring Machine P (21) HOL/10014/0022
22 2.(1) Segment Yard & Drive Site Locations P (22) HOL/10014/0023
23 2.(1) Precast Tunnel Lining Manufacture P (23) HOL/10014/0024
24 2.(1) Construction Plan - West Hyde P (24) HOL/10014/0025
25 2.(1) Construction Plan South Heath P (25) HOL/10014/0026
26 2.(1) Types of Tunnel: Mined tunnel P (26) HOL/10014/0027
27 2.(1) Cut and Cover Construction Methodology 1 P (27) HOL/10014/0028
28 2. (1) HS1 Cut and Cover Tunnel P (28) HOL/10014/0029
29 2. (1) Cut and Cover Construction Methodology 2 P (29) HOL/10014/0030
30 2. (1) D-wall Construction P (30) HOL/10014/0031
31 2.(2) Shaft Construction P (31) HOL/10014/0032
32 2.(3) Settlement INDICATIVE P1509 (32) 32 HOL/10014/0033
33 2.(3) Settlement & Rate of Tunnelling The rate of tunnelling will be important in minimising settlement. This is achieved by operating tunnel boring machines appropriately such as using Earth Pressure Balance machines in closed mode. In order to keep settlement to acceptable limits HS2 has specified maximum of 1% volume loss for bored tunnels. Continuous 24 hour tunnelling also minimises settlement as it doesn t allow time for the for the ground to fully relax. Other methods of controlling settlement include grouting techniques, particularly compensation grouting. P (33) HOL/10014/0034
34 2.(3) Settlement and Protective Measures The primary form of settlement mitigation will be by good tunnelling practice, including continuous working. Where required additional measures (e.g. grouting and structural solutions) will be carried out based on a three stage assessment as set out in Information Paper C3 Ground Settlement. Phase 1 Assessment: A preliminary assessment based on green field conditions will be undertaken. Where the predicted settlement is less than 10 mm or less than 1/500 slope, no further assessment required. Phase 2 Assessment: In the case of predicted settlement of more than 10mm or 1/500 slope an individual building assessment will be carried out. If the potential damage classification is category 2 (slight) or below no further assessment is required. Phase 3 Assessment: Where predicted settlement indicates potential damage classification of 3 (moderate) or higher a detailed evaluation will be carried out with the aim to reduce the effects to acceptable levels. Where this is not possible further protective measures will be implemented. Settlement Deed. Properties within 30 metres of tunnels may apply for a Deed as set out in information paper C3 to ensure that protective measures are implemented in accordance with the assessment criteria. P (34) HOL/10014/0035
35 2.(4) Construction Aspects Noise Tunnel Drive Sites Tunnel drive sites generate similar noise levels to other large construction sites. Tunnelling activities and the associated local site material handling will be operated 24 hours a day. Noise mitigation is provided by the standard means such as hoarding, muffling, baffles and noise suppression on plant and equipment. Tunnel sites will be subject to the same HS2 procedures set out under the Code of Construction practice and will be subject to Local Authority Approval under Section 61 of CoPA. P (35) HOL/10014/0036
36 2.(4) Construction Aspects Noise Tunnel Boring Sound and vibration from the tunnel boring machine will be perceptible inside properties for a few days either side of the TBM as it passes beneath them. The effects of ground borne sound and vibration from the TBM on building occupants will be short term and hence they are not considered to be significant. P (36) HOL/10014/0037
37 3. Costs of Tunnelling Fixed Costs TBM typically 15 to 25m Back up material handling similar costs order Power supply Linear Costs Labour Lining materials Excavated material disposal Ground monitoring Ground treatment Tunnel logistics Incremental Cost increases Surface arrangements for drive sites, reception sites, portal arrangements Increase in number of shafts Increase in number of cross passages; Shaft and tunnel M&E systems. P (37) HOL/10014/0038
38 Cost vs. Length P (38) HOL/10014/0039
39 Thank you P1509 (39) HOL/10014/0040
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