Assessment of the Twin-Tunnel Interaction Mechanism in Kenny Hill Formation Using Contraction Ratio Method

Govindasamy, Darvintharen; Ismail, Mohd Nazri; Zaki, Mohd; Ken, Tan; Cheah, Frankie; Likitlersuang, Suched

doi:10.1007/s40098-020-00411-9

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…This support mech sulted in pressure values escalating from 106 kPa at the tunnel crown to 185 k In the second phase, the tunnel undergoes a controlled contraction process, gradually reducing the size of the tunnel lining until the prescribed contraction ratio is achieved. The calculation of the contraction ratio is determined using Equation (1) [25]:…”

Section: Tunnel Geometry and Site Conditionsmentioning

confidence: 99%

Parametric Investigation of Interaction between Soil-Surface Structure and Twin Tunnel Excavation: A Comprehensive 2D Numerical Study

et al. 2023

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The growing demand for transportation tunnels in densely populated urban areas has led to the widespread adoption of twin tunnel configurations in contemporary infrastructure projects. This research focuses on investigating the complex interaction between soil, structures, and the excavation of twin tunnels. The study employs the tunnel boring machine (TBM) method and utilizes two-dimensional numerical modeling based on the finite element method (FEM). The numerical model is validated by comparing its results with field measurements obtained from a twin tunnel project in Italy, specifically the New Milan Metro Line 5. A comprehensive parametric study is conducted to analyze various parameters that influence soil–structure interaction during tunnel excavation. These parameters include the positioning of the tunnels in relation to each other, the spacing between them, the presence of structures above the tunnels, eccentricity between the structure axis and tunnel axis, and tunnel depth and diameter. Moreover, a comparative analysis is performed between scenarios with and without structures to elucidate the impact of structure presence on the interaction phenomenon. The research findings provide valuable insights into the intricate behavior of twin tunnels and their interaction with the surrounding soil and structures.

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Section: Tunnel Geometry and Site Conditionsmentioning

confidence: 99%

Parametric Investigation of Interaction between Soil-Surface Structure and Twin Tunnel Excavation: A Comprehensive 2D Numerical Study

et al. 2023

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“…The influence is usually decided by the ground properties, in-situ stress, tunnel span, rock pillar thickness, and excavation methods. Existing research concentrates on the interaction between left–right twin tunnels 8 – 13 , mechanical characteristics during tunnel construction 14 – 16 , ground settlement characteristic 17 , 18 , optimization of rock pillar thickness and construction sequences 19 – 23 , the prediction method of tunnel convergence 24 , as well as the influence of twin tunnels on the surrounding buildings 25 . Previous studies have also showed that excavation methods have a significant influence on the stability of twin tunnels 26 , 27 .…”

Section: Introductionmentioning

confidence: 99%

Stability evaluation of rock pillar between twin tunnels using the YAI

Zhang

Liu

et al. 2023

Sci Rep

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The stability of rock pillar is crucial for ensuring the construction safety of twin tunnels with small clearance, especially when transitioning from the traditional left–right tunnel layouts to the up-down configurations due to complex and variable site constraints. However, there are limited researches on the evaluation and comparative study of the stability of these two types of rock pillars in twin tunnels. This paper introduces the yield approach index (YAI) as a measure to assess the stability of rock pillar in twin tunnels with small clearance, and various influencing factors including side pressure coefficient (SPC), stress release rate (SRR), and the thickness of rock pillar (characterised by the ratio of rock pillar thickness to tunnel diameter, RPT/TD) are considered in the analysis. The study compares and analyzes the stability differences of the rock pillar in different situations. It is observed that the two sides of up-down tunnels pose a higher risk while the rock pillar in the left–right configuration being the most vulnerable. The stability of the rock pillar between the up-down tunnels is significantly higher than that of the left–right tunnels under similar conditions. Moreover, the up-down tunnels exhibit greater sensitivity to SPC, whereas the left–right tunnels are more sensitive to SRR. Additionally, the study reveals that increasing the RPT/TD can effectively improve the stability of the rock pillar within a specific range (1/4 to 2/3). The research method and obtained results of this paper can provide some important references for the stability evaluation and design of twin tunnels with small clearance.

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“…For instance, when geotechnical engineers in construction site unable to review the site condition with their naked eye, that therefore need the NDT designation, since it designated and have capabilities to collect data on the status of the ground condition without damaging it. On the other hand, using a sophisticated tool like Pundit and Resistivity apparatus to assist in characterizing the tropical Kenny Hill weathered sandstone material without the needs of boring excavation that allow for sustainable and saving the extensive usage of natural materials [5,8,9]. Resistivity and Pundit test is one of the alternative ways to determine the strength of the rock.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Tropical Kenny Hill Weathered Sandstone using Non-Disruptive Testing of Pundit and Resistivity Testing

Hamzah¹,

Yusof²

2022

JMechE

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Rock characterization of tropical Kenny Hill weathered sandstone have been an effort to be explored by using non-disruptive testing of pundit and resistivity testing to undertake sustainability issues and providing technical approach in exploration of weak rock materials solving. The purpose of this research is to determine the relationship between resistivity and uniaxial compressive strength of the most problematic rock type in Malaysia, namely Kenny Hill weathered sedimentary rocks, more usually referred to as sandstone. According to earlier study, sandstone has degraded in quality and has a tendency to disintegrate due to the tropical climate. Sandstone has a higher strength feature as compared to shale from Bandar Nusa Rhu, Shah Alam. Series of uniaxial compression were carried out to obtain the strength for rock samples. The strength properties of weathered sandstone are studied to quantify the weathering impact to these materials. Resistivity test and Pundit test were laboratory method conducted on the rock samples for verification of the correlation between resistivity and uniaxial compression. Results from the test were analyzed and their relationship with weathering grade was established. It signifies that sandstone strength increasing with the weathering grade.

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Assessment of the Twin-Tunnel Interaction Mechanism in Kenny Hill Formation Using Contraction Ratio Method

Cited by 6 publications

References 15 publications

Parametric Investigation of Interaction between Soil-Surface Structure and Twin Tunnel Excavation: A Comprehensive 2D Numerical Study

Parametric Investigation of Interaction between Soil-Surface Structure and Twin Tunnel Excavation: A Comprehensive 2D Numerical Study

Stability evaluation of rock pillar between twin tunnels using the YAI

Characterization of Tropical Kenny Hill Weathered Sandstone using Non-Disruptive Testing of Pundit and Resistivity Testing

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