Contents...Contents 1 1 Motivation 2 Shaft design alternatives Alternative 1 Alternative 2...
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Transcript of Contents...Contents 1 1 Motivation 2 Shaft design alternatives Alternative 1 Alternative 2...
Contents
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1 Motivation
2 Shaft design alternatives
Alternative 1
Alternative 2
Alternative 3
3 Conclusion and further study
Structure and supports
Sinking methods
Water control
Mucking methods
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It is unfortunate that there are few, if any, “standard designs” for shafts.Only some suggestions were proposed in some books and codes.
Specification for Tunneling, Thomas Telford, London, published in 2000
Two pages of general Clauses are used for shaft.
Hard Rock Miner's Handbook published in 2003
Some guidelines are listed in some sections specified for mining shafts.
Deep Excavation: A Practical Manual published in 2003
There is one section to discuss shafts for civil engineering purposes.
Engineering and Design Tunnels and Shafts in Rock published in 1997
Compiled by department of the army U.S. Army Corps of Engineers,
there are technical criteria and guidance for the planning, design and construction of shafts in
rock for civil work projects.
1. Dewatering and pressure relief
Sumps and ditchesWellpoint systemsDeep-well systemsVertical sand drainsElectro-osmosis
2. CutoffsConcrete walls/Diaphragm wallsCement and chemical grout curtainsSlurry wallsSteel sheet pilingFreezingPre-Excavation Grouting
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Water control
Slide 21
m14 I doubt!minglu, 9/4/2013
Slide 22
m15 I doubt!minglu, 9/4/2013
Slide 28
m16 I doubt!minglu, 9/4/2013
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Comparison
AlternativesMucking
Water controlRequired volume of excavation
Transportation
integrityMuckingmethod
Theoretical capacity* (m3/day)
1Vertical shaft with spiral
roadsSingle spiral road 14,400~24,000 Whole shaft
sectionHigh √
Double spiral road No limit
2Upper shaft with spiral
roads + lower spiral tunnel
Single spiral road 14,400~24,000 Upper shaft + Lower tunnel
Medium √Double spiral road No limit
3 Small shaftsingle car-lift 4,800~7,200
Whole shaft section
Low —double car-lift 9,600-14,400 Conveyor belt 24,000
Different alternatives have different advantages and disadvantages. It is hard to
tell which one is better than another one without considering project
requirements and local conditions.
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Conclusion and further study
Three alternatives type 1, 2 and 3 are proposed and the corresponding
sinking method and muck transport means are given.
The study is on-going:
A case application for Underground Warehousing and Logistics
Facility at Tanjong Kling & Jurong Hill.
Estimate of construction cost and time.
