scholarly journals A perspective of pipejacking works by tunnel boring machines in Hong Kong: part I – development, selection of design, operations and types of techniques

2021 ◽  
pp. 108-118
Author(s):  
Wilson W S Mok ◽  
Andrew S W Ng
Keyword(s):  
Hong Kong ◽  
Design Method ◽  
Tunnel Boring Machine ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Ground Conditions ◽  
History Of ◽  
Boring Machines ◽  
And Performance ◽  
Selection Of

In this paper, the history of pipejacking works by tunnel boring machines in Hong Kong, their development, selection of design method and tunnel boring machine (TBM), operations, length and alignment of a pipeline, types of techniques to suit different site constraints and ground conditions, and performance of the works are discussed. This paper should be read together with part II, which covers applications, problems encountered, cost and prospects.

Geotechnical risks, mitigation measures and performance of tunnel boring machine (TBM) tunnels for the Tuen Mun – Chek Lap Kok Link Project, Hong Kong

2019 ◽  
Vol 26 (4) ◽  
pp. 175-189
Author(s):  
Lucas Kwan Lok Chan ◽  
Alan Kwok Lun Kwong
Keyword(s):  
Hong Kong ◽  
Ground Improvement ◽  
Tunnel Boring Machine ◽  
Mitigation Measures ◽  
Face Stability ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Overall Performance ◽  
Boring Machines ◽  
And Performance

The Tuen Mun – Chek Lap Kok Link (TM-CLKL) project implemented latest innovation designs and ground improvement techniques in large slurry tunnel boring machines (TBM) tunnelling for constructing the sub-sea TBM tunnel in Hong Kong. Face stability, ground settlement, blow out, water ingress and ovalisation are always the major geotechnical risks for TBM tunnelling in the industry. This paper summarises the design considerations in terms of ground improvement and special arrangements of TBM tunnelling to mitigate the geotechnical risks and the improvement of the overall performance of TBM tunnelling under the TM-CLKL project. Field monitoring data such as surface settlement, ovalisation of segmental lining and ground improvement technique such as barrettes are presented.

scholarly journals A perspective of pipejacking works by tunnel boring machines in Hong Kong: part II – applications, problems encountered, cost and prospects

2021 ◽  
pp. 119-129
Author(s):  
Wilson W S Mok ◽  
Andrew S W Ng
Keyword(s):  
Hong Kong ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Boring Machines ◽  
Selection Of

In this paper, application of special techniques such as pipe roof construction, retractable TBM, and rectangular TBM to address site difficulties and constraints is highlighted. Cost and prospects of TBM pipejacking works are discussed. Some observations, including problems encountered and overcome, are also highlighted. This paper should be read together with part I, which covers development, selection of design, operations and types of techniques.

Research on the Load on Cutter Head of Hard Rock Tunnel Boring Machine

2014 ◽  
Vol 684 ◽  
pp. 303-307 ◽  
Author(s):  
Xiao Xu Zhao ◽  
Ya Dong Gong
Keyword(s):  
Hard Rock ◽  
Rolling Force ◽  
Tunnel Boring Machine ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Particle Hydrodynamics ◽  
Boring Machines ◽  
And Performance ◽  
Rock Tunnel ◽  
Cutter Head

Study on the load exerted on cutter head is very useful for the design and performance prediction of hard rock tunnel boring machines. A composite model based on smoothed particle hydrodynamics and finite element method was carried out using AUTODYN software to study the rock fragmentation mechanism of constant cross-section disk cutters in cutter head. The normal force, rolling force and side force on the disk cutters with different cutter radius were researched in the numerical simulation study. The results were verified by historical literature data. To obtain the distribution of the forces with different cutter radius, the loading of cutter head of a Ф5.75 hard rock tunnel boring machine were analyzed. The result shows that it is useful for cutter head’s design and its layout optimization.

scholarly journals Influence of geology on tunnel boring machine performance: A review

2020 ◽  
Vol 56 (1) ◽  
pp. 1-14
Author(s):  
P.K. Pandey ◽  
A.K. Raina ◽  
S. Deshmukh ◽  
R. Trivedi ◽  
R. Vajre ◽  
...  
Keyword(s):  
Dynamic Properties ◽  
Circular Cross Section ◽  
Tunnel Boring Machine ◽  
Intact Rock ◽  
Joint Spacing ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Machine Performance ◽  
Geological Conditions ◽  
Boring Machines

Tunnel boring machines are used for excavating a variety of soils and rocks for circular cross-section tunnels. Several published studies examined the role of rockmass in determining the cutting and advance rate of tunnel boring machines. A comprehensive review of literature was conducted to ascertain the influence of geological conditions on the performance of tunnel boring machines and revealed that different rock characteristics were used to define the tunnel boring machine performance. The progress of the tunnel boring machine was ascribed to the inherent properties of the rockmass, intact rock properties, and surrounding geological conditions. Several authors found that extreme geological conditions strongly influence the advance of the machine. The review revealed that joint spacing, angle between plane of weakness and tunnel axis, rock quality designation, and number of joint sets were the most important variables that influenced the advance rates of the tunnel boring machine. At least 12 intact rock variables were used to define tunnel boring machine performance with one to seven such variables used in combination. The compressive strength, tensile strength, and brittleness index emerged as most crucial intact properties. Rockmass classifications or indices of tunnel boring machine performance were used by different authors to predict their performance and even to define their selection methodology. Use of dynamic properties of rock/rockmass was identified as a grey area for future research by scientists.

scholarly journals Assessment of rate of penetration of a tunnel boring machine in the longest railway tunnel of Turkey

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Candan Gokceoglu
Keyword(s):  
Multiple Regression ◽  
Prediction Models ◽  
Tunnel Boring Machine ◽  
Regression Equations ◽  
Railway Tunnel ◽  
Tunnel Boring Machines ◽  
Rate Of Penetration ◽  
Tunnel Boring ◽  
Ann Models ◽  
Boring Machines

AbstractOne of the most important issues in tunnels to be constructed with tunnel boring machines (TBMs) is to predict the excavation time. Excavation time directly affects tunnel costs and feasibility. For this reason, studies on the prediction of TBM performance have always been interesting for tunnel engineers. Therefore, the purpose of the study is to develop models to predict the rate of penetration (ROP) of TBMs. In accordance with the purpose of the study, a new database including 5334 cases is obtained from the longest railway tunnel of Turkey. Each case includes uniaxial compressive strength, Cerchar Abrasivity Index, α angle, weathering degree and water conditions as input or independent variables. Two multiple regression models and two ANN models are developed in the study. The performances of the ANN models are considerably better than those of the multiple regression equations. Before deep tunnel construction in a metamorphic rock medium, the ANN models developed in the study are reliable and can be used. In contrast, the performances of the multiple regression equations are promising, but they predict lower ROP values than the measured ROP values. Consequently, the prediction models for ROP are open to development depending on the new data and new prediction algorithms.

Trenchless construction of Phase IIIA District Cooling System (DCS) by TBM pipejacking and hand-dug tunnelling on Kai Tak Development : Part II – The challenges

2019 ◽  
Vol 26 (1) ◽  
pp. 20-29
Author(s):  
Wilson Mok ◽  
Victor Lo ◽  
Germaine Chau ◽  
Louis Lau
Keyword(s):  
Cooling System ◽  
Lower Section ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Bay Area ◽  
Construction Techniques ◽  
Ground Conditions ◽  
Boring Machines ◽  
Trenchless Construction ◽  
To Receive

This paper discusses the challenges of constructing 1.75 km of concrete sleeve pipelines with diameters of 1,200mm, 1,500mm and 2,800mm using slurry operated Tunnel Boring Machines (TBMs) for installing District Cooling System (DCS) pipelines in highly variable ground conditions within the Kowloon Bay area. It covers the problems encountered, solutions provided, and recommendations made. Various construction techniques are also discussed including: running two TBMs in parallel from a jacking pit for the near simultaneous construction of two pipelines; enlarging the lower section of a receiving pit by the caving method to receive the TBM which entered the pit at an oblique angle, for turning inside the pit for removal after skin-off of the TBM; construction of a hand-dug tunnel from a receiving pit to receive three TBMs one at a time in a triangular configuration to suit site constraints. This paper should be read together with Part I which is entitled “Design and Construction Considerations” published in 2017.

SELECTION AND CALCULATION OF CUTTING HEAD FOR EARTH PRESSURE BALANCE TUNNEL BORING MACHINES

2019 ◽  
Vol 4 (1) ◽  
pp. 139-149
Author(s):  
A.V. Polyakov ◽  
◽  
A.B. Zhabin ◽  
P.N. Chebotarev ◽  
W.H. Khachaturian ◽  
...  
Keyword(s):  
Earth Pressure ◽  
Pressure Balance ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Cutting Head ◽  
Ground Conditions ◽  
Earth Pressure Balance ◽  
Boring Machines

Considered selection and calculation of cutting head for earth pressure balance tunnel boring machines. The conditions of choice of the working body are defined. The possible types of cutting heads and the features of choosing the type of their supports and drive mechanisms are described. The dependence for the calculation of the torque on the working body is given. The recommendations on the choice of the degree of openness of the cutting head, the type of destructive tool, expansion devices and seals of the bearing units of the drive of the working body depending on the ground conditions of penetration.

scholarly journals Development and Application of an Intelligent Evaluation and Control Platform for Tunnel Smooth Blasting

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Baoping Zou ◽  
Zhanyou Luo ◽  
Jianxiu Wang ◽  
Lisheng Hu
Keyword(s):  
Mobile Platform ◽  
Evaluation Theory ◽  
Tunnel Boring Machines ◽  
Tunnel Boring ◽  
Java Language ◽  
History Of ◽  
Boring Machines ◽  
Smooth Blasting ◽  
Control Application ◽  
And Control

Many tunnels around the world are still being constructed by drilling and blasting because these methods have an unmatched degree of flexibility relative to machine excavations using tunnel boring machines. At present, a large gap exists between evaluation theory and the control application of tunnel smooth blasting (TSB) quality. In this study, a handheld mobile platform that is based on the Android system and is written in the Java language is proposed to evaluate and control the performance of TSB. The function of this handheld mobile platform mainly includes data input, data modification, data deletion, weight setting for smooth blasting evaluation, smooth blasting quality assessment, and smooth blasting quality control. Using the proposed mobile platform, end users can evaluate and control TSB quality after each blast. The proposed handheld mobile platform is also applied to the real case history of line 6 in Guangzhou, China.

scholarly journals Use of saturation diving technique for tunnel boring machine cutterhead intervention in the Tuen Mun–Chek Lap Kok Link Sub-sea Tunnel Project, Hong Kong

2021 ◽  
Vol 28 (1) ◽  
pp. 31-38
Author(s):  
A W Y Chan ◽  
Charles H C Yeung ◽  
A J Westmoreland ◽  
S W Fok ◽  
Conrad C W Ng ◽  
...  
Keyword(s):  
Hong Kong ◽  
Cutting Tools ◽  
Tunnel Boring Machine ◽  
Tunnel Boring ◽  
Tunnel Section ◽  
Decomposed Granite ◽  
Boring Machines ◽  
Mixed Ground ◽  
Tunnel Alignment ◽  
Ground Condition

The entire Tuen Mun–Chek Lap Kok Link (TM-CLKL) was commissioned on 27 December 2020 and it comprises a 9km-long dual 2-lane carriageway between Tuen Mun and North Lantau, Hong Kong. Construction of the 5km-long sub-sea tunnels was carried out by two 14m diameter Tunnel Boring Machines (TBMs). The tunnel alignment for the TM-CLKL sub-sea tunnel section is in mixed ground condition with the first 500 m in mixed geology of slightly to moderately decomposed granite and completely decomposed granite (CDG), followed by soft ground condition with CDG, alluvial sand, alluvial clay and marine deposit. This mixed ground geology requires regular TBM cutterhead interventions to change the worn-out cutting tools during the tunnelling operation. As the tunnel alignment is up to 55 m below the sea level with the deepest seabed level at -21 mPD, in order to maintain the cutting face stability during the intervention, the intervention pressure could be up to 6 bars. This paper describes different techniques used for TBM interventions under the sea such as trimix bounce mode and saturation mode that appears first time in Hong Kong under a high hyperbaric pressure to change the worn-out cutting tools at the TBM cutterhead.

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