Geotechnical monitoring and analyses on the stability and health of a large cross-section railway tunnel constructed in a seismic area

Gao, Yang; Xu, Fei; Zhang, Qian; He, Peng; Qin, Zhe

doi:10.1016/j.measurement.2017.10.039

Cited by 24 publications

(6 citation statements)

References 21 publications

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“…To see more intuitively the influence of different surrounding rocks on tunnel deformation, the crown settlement monitoring data of grade III (BQ = 371) and V (BQ = 207) surrounding rocks are collected, as shown in Figure 3C. The tunnel crown settlement can be divided into three stages according to the settlement curve (Gao et al, 2018). In the first stage, the crown settlement of the grade V surrounding rock is faster than that of the grade III surrounding rock.…”

Section: Surrounding Rock Characteristicsmentioning

confidence: 99%

Mechanism and Sensitivity Analysis of Collapse in Large Section Mountain Neighborhood Tunnels

et al. 2022

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Collapse is one of the most frequent geological disasters in mountain tunnel engineering, posing major safety concerns for underground structures and construction crews. According to a catastrophic collapse in the shallow buried area of the Huangjiakuang tunnel in Weihai City, Shandong Province, the contributing factors, that is, the surrounding rock property, influence of neighboring tunnel construction, and tunnel over-excavation are systematically investigated. The tunnel collapse, breaks through the ground surface, is inverted using MIDAS GTS NX. A tunnel deformation analysis model is created using the quantitative methods of grey relation analysis and entropy weight methods based on crown settlement and lateral wall horizontal contraction during tunnel excavation. The surrounding rock property, the distance between the left and right tunnel faces, and the over-excavation height have a significant effect on tunnel deformation, which are quantitatively interpreted using the tunnel deformation analysis model. This study is valuable for the multi-factor analysis of tunnel deformation and determining the main contributing factors to the collapse quantitatively.

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Section: Surrounding Rock Characteristicsmentioning

confidence: 99%

Mechanism and Sensitivity Analysis of Collapse in Large Section Mountain Neighborhood Tunnels

et al. 2022

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“…The ratio of the average normal-contact pressure acting on the secondary lining to the average surrounding rock pressure acting on the primary lining is directly related to the safety of the supporting system [21], which can be expressed as:…”

Section: Normal-contact Pressure Between Primary and Secondary Liningsmentioning

confidence: 99%

Geotechnical monitoring and safety assessment of large-span triple tunnels using drilling and blasting method

Li¹,

Zhang²,

Fang³

et al. 2019

J. vibroeng.

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The excavation of large-span triple tunnels using drilling and blasting method inevitably causes complicated load transfer effects and induces potentially damaging ground vibrations. In this study, the structural responses (including the surrounding rock pressure, normal-contact pressure between the primary and secondary linings, internal forces in the secondary lining) and the seismic responses (including peak particle velocity and corner frequency), are systematically recorded. It is found that the first-excavated left tunnel is influenced heavily by the excavation of the last-excavated middle tunnel, whereas it is hardly affected by the excavation of the second-excavated right tunnel. The load carried by the primary lining is approximately three times as that carried by the secondary lining. The middle tunnel was in the least desirable state due to the formation of the large Protodyakonov's equilibrium arch (PEA). Based on timely feedback of the comprehensive monitoring system, a series of vibration-reducing techniques were applied and effectively guaranteed safety during blasting construction. By referring to Chinese codes, the minimum safety factor of the secondary lining is 1.3; the maximum PPV (0.15 cm/s) is lower than the allowable value; and the corner frequency (40-140 Hz) will not cause resonant vibration of the Great Wall.

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“…Tunnel construction is an essential part of urban infrastructure. Recent seismic data show that tunnels are vulnerable to long-term seismic damage [1][2][3][4][5][6][7][8][9]. Tunnel damage is determined by the surrounding soil, the tunnel's submerged depth, the earthquake magnitude, and the groundwater table (G.W.T.)…”

Section: Introductionmentioning

confidence: 99%

Seismic Isolation Materials for Bored Rock Tunnels: A Parametric Analysis

Elgamal,

Elfaris

2024

Infrastructures

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Most recent tunnel designs rely on more thorough analyses of the intricate rock interactions. The three principal techniques for excavating rock tunneling are drill-and-blast for complete or partial cross-sections, TBM only for circular cross-sections with full faces, and road header for small portions. Tunnel-boring machines (TBM) are being utilized to excavate an increasing number of tunnels. Newer studies have demonstrated that subterranean structures such as tunnels produce a variety of consequences during and after ground shaking, challenging the long-held belief that they are among the most earthquake-resistant structures. Consequently, engineering assessment has become crucial for these unique structures from both the geotechnical and structural engineering standpoints. The designer should evaluate the underground structure’s safety to ensure it can sustain various applied loads, considering both seismic loads and temporary and permanent static loads. This paper investigates how adding elastic, soft material between a circular tunnel and the surrounding rock affects seismic response. To conduct the study, Midas/GTS-NX was used to model the TBM tunnel and the nearby rock using the finite element (F.E.) method to simulate the soil–tunnel interactions. A time–history analysis of the El Centro (1940) earthquake was used to calculated the stresses accumulated in the tunnels during seismic episodes. Peak ground accelerations of 0.10–0.30 g, relative to the tunnel axis, were used for excitation. The analysis utilized a time step of 0.02 s, and the duration of the seismic event was set at 10 s. Numerical models were developed to represent tunnels passing through rock, with the traditional grout pea gravel vs. isolation layer. A parametric study determined how isolation material characteristics like shear modulus, Poisson’s ratio, and unit weight affect tunnel-induced stresses. In the meantime, this paper details the effects of various seismic isolation materials, such as geofoam, foam concrete, and silicon-based isolation material, to improve protection against seismic shaking. The analysis’s findings are discussed, and how seismic isolation affects these important structures’ performance and safety requirements is explained.

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Geotechnical monitoring and analyses on the stability and health of a large cross-section railway tunnel constructed in a seismic area

Cited by 24 publications

References 21 publications

Mechanism and Sensitivity Analysis of Collapse in Large Section Mountain Neighborhood Tunnels

Mechanism and Sensitivity Analysis of Collapse in Large Section Mountain Neighborhood Tunnels

Geotechnical monitoring and safety assessment of large-span triple tunnels using drilling and blasting method

Seismic Isolation Materials for Bored Rock Tunnels: A Parametric Analysis

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