Geotechnical investigations and remediation design for failure of tunnel portal section: a case study in northern Turkey

Kaya, Ayberk; Karaman, Kadir; Bulut, Fikri

doi:10.1007/s11629-016-4267-x

Cited by 33 publications

(6 citation statements)

References 39 publications

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“…Different rock physical parameters have an important influence on the structural design. Such as the weight γ(kN/m 3 ), deformation modulus E(GPa), internal friction angle φ( °), cohesion c(MPa), and Poisson's ratio μ (Kaya et al, 2017). For this purpose, according to the data in the table of physical and mechanical parameters of rock bodies provided by the specification for the classification of engineering rock bodies, the curves of each physical and mechanical parameter are plotted with BQ as the horizontal coordinate, as shown in Figure 3.…”

Section: Mechanical Parameter Estimationmentioning

confidence: 99%

A quantitative assessment method for the correlation between rock mass basic quality and Protodyakonov coefficient

Ji,

Li,

Zhang

et al. 2023

Front. Earth Sci.

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With the implementation of the “Belt and Road” initiative, tunnel projects were designed in accordance with Russian design specifications and constructed by Chinese companies in countries along the route. Design companies and construction companies use different rock classification methods, which will increase the safety risk and cost of the tunnels. Therefore, it is necessary to study the correlation between Chinese engineering rock mass classification and Russian rock mass classification. The goal was to establish the correlation between rock mass basic quality (BQ) and Protodyakonov coefficient (f) for rock mass classification. Firstly, based on the equivalence principle of uniaxial compressive strength (UCS), the relationship between BQ and f containing the velocity index of rock mass (Kv) was established by comparing the relationship between f and BQ in the empirical formula of UCS. Secondly, through the equivalent principle of volumetric joint count of rock mass (Jv), we compared the empirical formula between the intactness index of Kv and rock quality designation (RQD) and conducted linear regression analysis on a large amount of data. The relationship between Kv and RQD was established. Finally, the relationship between BQ and f is quantitatively expressed and a classification table corresponding to the Russian rock classification and the Chinese engineering rock classification is obtained. The method is applied to Kyrgyzstan mountain tunnels.

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Section: Mechanical Parameter Estimationmentioning

confidence: 99%

A quantitative assessment method for the correlation between rock mass basic quality and Protodyakonov coefficient

Ji,

Li,

Zhang

et al. 2023

Front. Earth Sci.

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“…Shallow-buried biased tunnels are associated with highly weathered overlying strata and weak rock mass. The weathering degree of overlying strata continues to decrease with an increase in buried depth, and a soil-rock interface (SRI) emerges between the strong weathering layer and the medium weathering layer (Kaya et al, 2017;Zhang et al, 2021). Tunnels inevitably OPEN ACCESS EDITED BY Yuwei Zhang, Xi'an University of Architecture and Technology, China encounter the SRI during the tunneling process and with increasing buried depth (Zhou et al, 2014;.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behaviors of surrounding rock and supporting structure of shallow-buried unsymmetrical pressure tunnel crossing soil–rock interface

Zhang

Wang

et al. 2023

Front. Earth Sci.

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Shallow bias tunnels are sensitive at the entrance section, where the existence of soil–rock interface (SRI) results in more complex deformation of surrounding rock and supporting structure. This study investigates the mechanical properties of surrounding rock and supporting structure of a shallow-buried bias tunnel crossing the soil–rock interface by a combination of model tests and numerical simulations. A shallow-buried biased tunnel with significant cracking at its entrance section is selected in southwest China. The plastic zone distribution, deformation, and pressure of surrounding rock, as well as the stress and deformation of supporting structure, are analyzed under different conditions with the tunnel vault, arch haunch, arch spring, and wall foot crossing the soil–rock interface. The test and numerical results show that the internal force of the lining structure is the largest at the left arch haunch and the right arch spring, with cracks occurring in the project. The surrounding rock and supporting structure are most prominently influenced by the arch haunch and arch spring crossing the soil–rock interface among different positions of the tunnel. The supporting structure is subjected to stress in three modes: there is mainly shearing when the tunnel vault passes through the soil–rock interface, extrusion and shearing co-exist when the tunnel arch haunch and arch spring pass through the soil–rock interface, and extrusion is dominant when the tunnel wall foot passes through the soil–rock interface. Inserting grouting steel pipes perpendicular to the soil–rock interface on the deep-buried side of the tunnel can effectively control the deformation of surrounding rock and the stress of supporting structure.

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“…However, in tunneling, there is no specific procedure to assess the behavior of the rock mass during digging with respect to the failure mechanism previously defined in the design process [16][17][18]. Hence, the stability of portal slopes should not be considered separately from tunneling [19][20][21], because the collapse that may occur during the excavation of the portal will completely stop the tunnel digging [22][23][24][25][26][27]. Thus, practical limitations greatly affect the ability to assess the stability of rock sections and slopes in real time, so we use analytical methods such as kinematics, LE, FE or discrete element modeling [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Slope Stabilization of Twin-Tubes Tunnel Portal by Anchor Bolts Support System

KHELALFA

Sakalli

Aygar

et al. 2022

Romanian Journal of Transport Infrastructure

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It is not known in the literature why the behavior of rocks incurs the tunnel excavation and it remains unclear for what has been calculated in the initial studies. That’s why the most important thing to consider in tunnel construction works is to monitor rock mass behavior. The finite element method (FEM) can also analytically represent the static and dynamic behavior of the rock mass. Concretely, this makes it possible to calculate the behavior of very complex objects numerically. The present study embraces a geophysical prospecting which was carried out by the method of surface seismic tomography to reveal the lithology of the different formations and their geometry and the variation in speed of the subsurface formations at the level of the South portal of the Texana tunnel on Jijel province, in Algeria. The paper also consists in making a two-dimensional numerical study of the stability of the tunnel portals with the Phase.2 2D program. On the other hand, the calculation results will be compared with in-situ surveying to strengthen the numerical modeling. It can be concluded that the Anchor Bolts Support System gives good results in terms of displacement of the rock mass and satisfactory stability in terms of collapse analyzis of the tunnel portals.

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Geotechnical investigations and remediation design for failure of tunnel portal section: a case study in northern Turkey

Cited by 33 publications

References 39 publications

A quantitative assessment method for the correlation between rock mass basic quality and Protodyakonov coefficient

A quantitative assessment method for the correlation between rock mass basic quality and Protodyakonov coefficient

Mechanical behaviors of surrounding rock and supporting structure of shallow-buried unsymmetrical pressure tunnel crossing soil–rock interface

Slope Stabilization of Twin-Tubes Tunnel Portal by Anchor Bolts Support System

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