Prediction of TBM Advance Rate Considering Geotechnical and Operating Risks: An Example of the Lanzhou Long Water Conveyance Tunnel, China

Yan, Changbin; Wang, Hejian; Yang, Fengwei; Yao, Wenmin; Yang, Jun

doi:10.1007/s00603-022-02782-2

Cited by 6 publications

(4 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, a grinding effect occurs between the disc cutter and the rock, resulting in increased powdery rock chip content, smaller rock chip particle sizes, an elevated SE, and a reduced CI. Therefore, the rock-breaking efficiency of the TBM decreases [31], as illustrated in Figure 9c. During this period, penetration is minimal, resulting in limited rock-breaking and slower tunneling progress, which is not conducive to efficient tunneling.…”

Section: Correlation Between Rock-breaking Efficiency and Tunneling P...mentioning

confidence: 91%

Improving Tunnel Boring Machine Tunneling Performance by Investigating the Particle Size Distribution of Rock Chips and Cutter Consumption

Wang,

Yan,

Guo

et al. 2024

Buildings

View full text Add to dashboard Cite

The construction environment of deep rock tunnels is complex, and effectively enhancing tunnel boring machine (TBM) tunneling efficiency is paramount. Increasing rock-breaking efficiency and minimizing cutter consumption are essential strategies for improving TBM tunneling efficiency. Selecting suitable tunneling parameters is crucial for enhancing rock-breaking efficiency and reducing cutter consumption. Existing research on the optimization of the ratio of maximum cutter spacing to penetration (Smax/P) based on field-measured data is limited, and few studies compare and analyze the relationship between SE, CI, and the Smax/P ratio separately. Consequently, this study determined optimal tunneling parameters for various types of surrounding rock and construction environments, aiming to more accurately optimize TBM tunneling performance during construction processes based on on-site construction data. This study conducted a comparative analysis of specific energy (SE) and the coarseness index (CI). Under both working conditions, the quadratic fitting coefficients of the CI are 4.2% and 10.6% higher than those of the SE, respectively, with the CI selected to represent the particle size distribution of rock chips. Finally, taking into account both the correlations between the CI and the ratio of maximum cutter spacing to penetration (Smax/P), as well as cutter consumption and the Smax/P ratio, an optimization method for the TBM tunneling parameter was established under both dry and saturated conditions. The research findings indicate that cutter consumption exhibits an exponential increase with a higher rock Cerchar Abrasivity Index (CAI); it initially decreases as the Smax/P ratio increases and subsequently increases in both dry and saturated conditions. Instead, the CI demonstrates an initial increase and subsequent decrease as the Smax/P ratio increases. Maximizing rock-breaking efficiency and minimizing cutter consumption are crucial for improving tunneling performance. In saturated conditions, the corresponding optimal Smax/P ratio ranges are 7.055–8.319 for soft rock, 8.606–8.931 for medium–hard rock, and 13.50–14.00 for hard rock, and these optimal ranges under dry conditions are 8.495–9.457, 10.972–12.169, and 16.5–17.5 for the same rock types. This study provides optimal Smax/P ratio ranges for TBM tunneling, thereby significantly enhancing tunneling efficiency.

show abstract

Section: Correlation Between Rock-breaking Efficiency and Tunneling P...mentioning

confidence: 91%

Improving Tunnel Boring Machine Tunneling Performance by Investigating the Particle Size Distribution of Rock Chips and Cutter Consumption

Wang,

Yan,

Guo

et al. 2024

Buildings

View full text Add to dashboard Cite

show abstract

“…Complexity will greatly increase with the length of tunnel which passes through different geological structures, especially unfavorable geological sections including fracture collapse zones, water inrush, and unstable surrounding rock [4,6]. This correspondingly increases the geological risk of tunnel construction with a selected TBM [11,31]. Due to the uncertainty of hydrogeological environments during construction, a TBM is prone to various geological hazards when digging in poor geological sections, which affects the construction progress.…”

Section: Geological Riskmentioning

confidence: 99%

“…Therefore, along with the construction of numbers of long-distance inter-basin water conveyance projects, shield technology has been more and more widely applied in China, and corresponding specifications have been formulated [7][8][9]. However, due to the complexity and variable geological conditions faced by inter-basin water conveyance projects and the limited practice of TBM technology in this area of China, the safety of a TBM tunnel construction is still a prominent problem [10,11]. This is a reminder that theoretical exploration and engineering practice are significant for the evaluation and control of safety-risk in TBM tunnel construction.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the above discussion, this study is rare in addressing safety-risk assessment by the fuzzy evidence reasoning method for TBM construction of a hydraulic tunnel with the features of long distance passed through different geological conditions [5,11,31]. In this paper, the evaluation indices of construction safety-risk with the characteristics of TBM tunnel construction were first analyzed while an evaluation index system was built.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Safety-Risk Assessment for TBM Construction of Hydraulic Tunnel Based on Fuzzy Evidence Reasoning

Zhang

Wang

et al. 2022

Processes

View full text Add to dashboard Cite

Due to multiple factors influencing the construction safety of TBM hydraulic tunnels, risk assessment is a critical point of a construction management plan to avoid possible risks. In this paper, a safety-risk evaluation index system of TBM construction for hydraulic tunnels is built based on the identification and analysis of possible sources of risk in techniques, geologic, equipment, management, and accidents. Considering the influence of factors such as the experience level and the expertise of decision makers, a combination assignment method of index weights is proposed based on binary semantics. On the basis of a fuzzy normal distribution used as the subordinate function distribution of fuzzy evaluation levels, the subordinate function distribution of fuzzy evaluation levels under multi-level intersection situations is introduced, and a comprehensive evaluation model of safety risks for TBM tunnel construction is built. The validity and practicality of the evaluation model is examined with the combination of a long-distance water conveyance tunnel project. Results show that the construction safety-risk of the TBM hydraulic tunnel project belongs to the middle-high level, and the safety accident risk belongs to the low level. The study provides guidance of evaluation and control of risks for this tunneling construction being successfully completed.

show abstract

Study on the key factors affecting the performance of shield scrapers in gravelly soil strata

Yang,

Yi,

Zhang

2024

Alexandria Engineering Journal

View full text Add to dashboard Cite

Prediction of TBM Advance Rate Considering Geotechnical and Operating Risks: An Example of the Lanzhou Long Water Conveyance Tunnel, China

Cited by 6 publications

References 28 publications

Improving Tunnel Boring Machine Tunneling Performance by Investigating the Particle Size Distribution of Rock Chips and Cutter Consumption

Improving Tunnel Boring Machine Tunneling Performance by Investigating the Particle Size Distribution of Rock Chips and Cutter Consumption

Safety-Risk Assessment for TBM Construction of Hydraulic Tunnel Based on Fuzzy Evidence Reasoning

Study on the key factors affecting the performance of shield scrapers in gravelly soil strata

Contact Info

Product

Resources

About