Control of settlement and volume loss induced by tunneling under recently reclaimed land

Kwong, Akl; Ng, Conrad C W; Schwob, A.

doi:10.1016/j.undsp.2019.03.005

Cited by 16 publications

(4 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Shirlaw (2016a) showed how the penetration index, the specific energy and the cutter wear during EPB tunnelling in mixed-face conditions increased dramatically as the proportion of rock increased, particularly once the proportion of strong rock increased to over 50% of the total face area. As recorded by Shirlaw et al (2017) and Kwong et al (2019), the use of slurry TBMs in similar mixed-ground conditions in weathered granite in Hong Kong did not experience similar problems with ground control. With the slurry TBMs, reasonable rates of progress were achieved despite the need to spend significant amounts of time changing cutters due to the abrasive nature of the rock and the saprolite; nor was there need to use grouting to aid the tunnelling, except at break-in and break-out.…”

supporting

confidence: 67%

Discussion: Challenges of earth pressure balance tunnelling in weathered granite with boulders

Zhang

Shen

Zhou³

et al. 2021

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

show abstract

supporting

confidence: 67%

Discussion: Challenges of earth pressure balance tunnelling in weathered granite with boulders

Zhang

Shen

Zhou³

et al. 2021

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

show abstract

“…For tunnelling in the northern approach tunnel from the north LS to the NVS through newly reclaimed ground, and soft alluvium/weaker CDG, TBM (S880) advanced at an average of 3.3 m/day with a best record of 10 m in one day, whereas TBM (S882) in the northern approach tunnel advanced at an average of 4.7 m/day with a best record of 12.8 m in one day. Only minor settlement was recorded on the ground surface across this zone with a volume face loss of less than 1.3%, which is below the specification of 2% (Kwong et al, 2019).…”

Section: Tunnelling Performance Overviewmentioning

confidence: 65%

“…The TBMs were tailor-made and equipped with innovative equipment to minimise Tunnelling in newly reclaimed land poses a risk of lining ovalisation and instability resulting from continuous settlement/consolidation of the land. In order to accelerate the consolidation of the newly reclaimed land, different ground treatment methods were used between the LS of the TBMs and the NVS (Figure 22) (Kwong et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Construction of the Tuen Mun–Chek Lap Kok Link Sub-sea Tunnels in Hong Kong

Chan¹,

Yeung

Westmoreland

et al. 2021

HKIE Transactions

View full text Add to dashboard Cite

The entire Tuen Mun–Chek Lap Kok Link (TM-CLKL) was commissioned on 27 December 2020 and comprises a 9 km dual twolane carriageway between Tuen Mun and North Lantau, Hong Kong. The challenges for the construction of the TM-CLKL tunnels included sub-sea tunnelling up to 55 m below sea level in mixed ground geology that required replacement of tunnel boring machine (TBM) cutting tools at hyperbaric pressure up to 5.8 bars; replacement of worn TBM cutting tools in complicated ground conditions; construction of approach tunnels in newly reclaimed land subject to long-term consolidation; and construction of cross passages at 100-metre intervals between the two sub-sea tunnels with a risk of sea water ingress at 5.5 bars. This project has deployed sophisticated techniques to surmount the challenges encountered during construction of the five-kilometre-long sub-sea tunnels. These included the use of the world’s largest slurry-type Mixshield TBM, 17.63 m in diameter, for the construction of the northern approach tunnel, followed by two 14 m diameter slurry-type Mixshield TBMs for the construction of the sub-sea tunnels; use of saturation diving techniques for TBM cutterhead interventions up to 5.8 bars which was the first such works in Hong Kong and one of only a few uses of saturation diving in tunnelling worldwide; use of ground freezing techniques in complicated ground conditions for TBM interventions to change worn cutting tools at the TBM cutterhead; TBM tunnelling in newly reclaimed land at the northern landfall and the southern landfall; and the construction of cross passages by mini-TBM using pipe jacking methods between the two main tunnel tubes which was the first such works ever undertaken anywhere in the world. This paper introduces the successful implementation of these techniques for the satisfactory completion of the TM-CLKL sub-sea tunnels.

show abstract

“…In the soft clay layer, the volume loss caused by shield tunneling is mostly between 0.5% and 2.0%. Compared with the settlement-sensitive area in Shanghai, the volume loss caused by tunnel construction in the newly reclaimed land area of Hong Kong is likely to be larger, but the operation of shield machine drivers has a great impact on the settlement, which is not easy to predict [5][6][7]. Therefore, it is very important to determine a reasonable range of shield tunneling parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shield Tunneling Control in Full Section Water-Rich Sand Layer of Collapsible Loess

Mei

Zhang

et al. 2022

Geofluids

View full text Add to dashboard Cite

Taking China’s first application of domestic shield tunneling in a water-rich sand layer for crossing a high-speed railway as research background, the influence of changes in the shield tunneling parameters on ground settlement is analyzed based on field tests, and a construction control method suitable for shield tunneling under a risk source in a water-rich sand layer is proposed. The test results show that the use of 10% sodium bentonite as the soil modifier for soil pressure balance shield tunneling into the water-rich sand layer has advantages, while adding 50% loess into the bentonite slurry in the gravel sand layer can greatly improve the impermeability of the soil; the settlement of soil can be effectively reduced by using the special segment with grouting holes for deep grouting and applying the adaptive transformation of the shield cutter. Based on the statistical analysis results, a reasonable range for the cutter head torque, cutter head speed, chamber pressure, bentonite injection volume, and advanced speed in the water-rich sand layer can provide a construction control basis for similar projects and provide data support for the compilation of relevant specifications.

show abstract

Control of settlement and volume loss induced by tunneling under recently reclaimed land

Cited by 16 publications

References 3 publications

Discussion: Challenges of earth pressure balance tunnelling in weathered granite with boulders

Discussion: Challenges of earth pressure balance tunnelling in weathered granite with boulders

Construction of the Tuen Mun–Chek Lap Kok Link Sub-sea Tunnels in Hong Kong

Experimental Study on Shield Tunneling Control in Full Section Water-Rich Sand Layer of Collapsible Loess

Contact Info

Product

Resources

About