Geotechnical Design Parameters for a Metro Tunnel from Pressuremeter Tests

Sundaram, Ravi; Gupta, S. P. Sen; Gupta, Sorabh; Lal, Bhajan

doi:10.1007/978-981-13-6713-7_5

Cited by 3 publications

(2 citation statements)

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“…The advantage of using the Pressuremeter Test (PMT) is that it can measure the existing soil stress (in-situ stress), in-situ soil modulus, and the relationship between soil stress-strain [11]. PMT testing produces reliable parameters for geotechnical design purposes and eliminates sample disturbances [12]. The stratification profile of the drilled soil in the tunnel area can be seen in the following figure.…”

Section: Soil Investigation and Design Parametermentioning

confidence: 99%

Investigation of Twin Tunnel Deformation with Umbrella Grouting Protection & NATM Tunneling using 3D Finite Element: Case Study Cisumdawu Tunnel

Wijaya

Rahardjo

Lim

2021

UKaRsT

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Cisumdawu Tunnel is a twin tunnel 472 m long located in Sumedang. Twin tunnel construction can cause additional ground settlement and tunnel deformation. The tunnel construction method used is the New Austrian Tunneling Method (NATM) and umbrella grouting protection system. The principle of NATM is to maximize surrounding soil capacity to support its weight and balance the stresses around the tunnel. Investigation of tunnel deformation is important to know tunnel structure behavior and avoid possible failure. This research aims to know tunnel deformation and the effect of twin tunnel construction on the deformation and ground settlement. The data used such as tunnel geometry, monitoring data, pressuremeter test, and the drilling test. The 3D analysis will be performed for a single tunnel and twin tunnel using Midas GTS-NX, and monitoring data will be used for verification analysis. The 3D FEM help to model the soil condition and construction stage according to the actual condition. The analysis results show the maximum tunnel deformation that occurs from the beginning of the tunnel construction is 12.64cm. If the deformation starts to be calculated following the monitoring reading time, after the excavation at the monitoring point, the maximum deformation of the analysis results is 3.3&4.4cm, where the monitoring shows maximum deformation of 3.3&4.3cm. Through the results, it can be said that the analysis using 3D FEM with pressuremeter test parameter represents actual conditions. Twin tunnel construction side-by-side increases ground settlement and lateral tunnel deformation significantly. Hence, it shows that tunnel analysis using 3D FEM recommends for future investigation of tunnel deformation.

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Section: Soil Investigation and Design Parametermentioning

confidence: 99%

Investigation of Twin Tunnel Deformation with Umbrella Grouting Protection & NATM Tunneling using 3D Finite Element: Case Study Cisumdawu Tunnel

Wijaya

Rahardjo

Lim

2021

UKaRsT

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“…In-situ tests. The pressuremeter tests require the realization of several surveys, of which the Menard pressuremeter survey is the most consequent test [6] of all the geotechnical tests in situ.…”

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confidence: 99%

Analysis and prediction of surface settlements during the digging of underground mining works (Algeria)

Morsli,

Berdoudi,

Hafsaoui

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. To analyze, study and predict surface settlements during the digging of a tunnel in an urban area located in the Algerian capital and to take the necessary measures. Methodology. Based on the physical and mechanical parameters and the geological characteristics of the actual traversed layer, and taking into account the geometric parameters of the tunnel, the mechanical model is established, and the numerical simulation is designed to determine the settlement deformation and displacement of the overlying zone under mining disturbance. Findings. Due to the impact of the excavation works, the land will undergo large deformations such as collapse. So, it is necessary to take corrective measures to limit its effect on the surrounding environment and protect urban areas. Originality. The application of a complex of methods allowed providing a predictive assessment of the safety of mining workings in urban conditions. The study was conducted in two main stages; a geotechnical characterization in situ and in the laboratory to determine the necessary properties of the soil and rock mass used in our model, and in a second step, the development of feedback analysis using numerical modelling based on the data collected. Practical value. From this study, the results obtained seem to show vertical displacements that exceed international standards in urban areas (1/1000, which can induce significant ground movements and therefore an influence on the surrounding environment. As a solution, there is a possibility of reducing the deformations by improving the mechanical properties of the soil carrying the project using the Jet-Grouting technique – the technique has shown its effectiveness in reducing settlements with a reduction rate of 78 %.

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