The Application of the Strength Reduction Shortest Path Method to the Stability Analysis of Shallow Buried Tunnel

Wang, Wei; Zhang, Jiaqi; Li, Ao

doi:10.1007/s10706-021-01944-3

Cited by 5 publications

(5 citation statements)

References 21 publications

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“…That is, in the finite element calculation, for a certain assumed strength reduction factor F, the original strength parameters of each soil layer are reduced according to formula (4) to carry out elasticplastic finite element calculation of the slope. According to a certain instability criterion [33], the slope reaches the limit equilibrium state and the corresponding strength reduction factor F is the anti-sliding safety factor Fs of the retaining wall. Otherwise, the newly assumed reduction factor is repeated until the soil reaches the critical limit equilibrium state.…”

Section: Plos Onementioning

confidence: 99%

Study on stress and deformation characteristics of existing-new two-stage cantilever retaining wall

Ma,

Liu,

Hao

et al. 2024

PLoS ONE

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A two-stage cantilever retaining wall is composed of two single-stage cantilever retaining walls, which are stacked up and down. The structure not only has the advantages of a single-stage retaining wall, but also compensates for the shortcomings of the height limit of the single-stage retaining wall; therefore, it has been gradually applied in projects. Based on the actual project of Zhongwei-Lanzhou Passenger Dedicated Line into Lanzhou Hub, this paper studies the influence of the construction of new cantilever retaining wall and the filling of subgrade on the deformation and earth pressure of the new cantilever wall and the existing cantilever wall by means of field test and numerical simulation. The results show that with an increase in the filling height after the new cantilever wall (upper wall), the horizontal displacement of the top of the upper and lower walls increased nonlinearly. The displacement direction of the upper wall was the filling direction, and that of the lower wall was the deviation from the filling direction. The higher the filling height, the greater is the displacement. With an increase in the filling height, the earth pressure behind the upper wall increases gradually along the wall height and decreases slightly to the bottom of the wall, which is approximately a linear distribution. The earth pressure behind the existing cantilever wall first increases along the wall height and gradually decreases after reaching a certain depth, but the earth pressure of the lower wall does not increase significantly with an increase in the filling height behind the upper wall. The slope failure mode is the overall sliding failure of the retaining wall together with the fill soil. The sliding surface passed through the lower edge of the lower wall heel and was similar to an arc shape. The stability of the two-stage cantilever retaining wall was better than that of a single-stage retaining wall. Finally, a calculation method for the overall stability and earth pressure of the existing two-stage cantilever retaining wall was proposed.

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Section: Plos Onementioning

confidence: 99%

Study on stress and deformation characteristics of existing-new two-stage cantilever retaining wall

Ma,

Liu,

Hao

et al. 2024

PLoS ONE

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“…However, for different parameter, their contribution to reaching the final limit state are not equal in practical engineering. Thus, some scholars have proposed that a combine of different reduction factors for different parameters rather than one same reduction factor value should be considered in the practice of SRM [4]. Throughout this paper, the abbreviation "N-SRM" will be used to refer to this kind of SRM using different reduction factors for different parameters, which means the new type of strength reduction method.…”

Section: Introductionmentioning

confidence: 99%

Surrounding Rocks Stability Analysis of Circular Tunnel Using Strength Reduction Method and Sliding-t Test

Du,

Ke,

Kong

2023

Advances in Transdisciplinary Engineering

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SRM (strength reduction method) is a kind of numerical limit method widely used in stability analysis of geotechnical engineering. This paper introduced the origin, basic principles, and operation process of SRM firstly, then introduced a new type of SRM considering the “strength reduction shortest path”. Moreover, both two methods were applied to solve the safety factor of an identical simulation model. In addition, sliding-t test was engaged to determine the accurate abrupt change position of the feature point’s displacement, which presented considerable operability and accuracy. Finally, it was concluded that this new type SRM is more conservative than the traditional SRM, and the calculated safety factor of the same simulation model is about 25% lower.

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“…Zheng et al (2006Zheng et al ( , 2008 formulated a strength reduction finite element method (SRFEM) to deal with this problem. Athough still in research phase, the SRFEM has gradually been recognized in engineering practice in China (Zhang, et al, 2007;Pan et al, 2021;Wang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Construction risk control technology of a large tunnel complex in urban area

Gao

Kong²,

Wu³

et al. 2022

Front. Earth Sci.

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The stability of the surrounding rock analysis and evaluation during tunnel construction is the basis of tunnel construction risk control. In this paper, we focus on the stability of a large-scale transportation tunnel complex during its construction in a densely-populated urban area. The tunnel complex includes seven shallow-buried tunnels with large cross-sections. In order to gain insight into the excavation influence of the different tunnels, stability analyses were first carried out using FLAC3D numerical simulation. Results showed that the tunnels were subjected to heave and crown settlement induced by adjacent excavation. Also, stress concentrated in the rock blocks connecting different tunnels. Subsequently, a bench-scale model test was performed to understand the failure of the rock blocks and to examine the accuracy of the numerical simulation. The test results agreed well with the numerical simulation. Based on the numerical and test results, the mechanism of the rock blocks failure was explained and construction risk control technology to stabilize the rock blocks was proposed. The construction risk analyses revealed: 1) tunnels are subjected to significant heave due to the excavation of tunnels located above; 2) the stability of the rock blocks is the paramount determinant for stabilizing the whole tunnel complex; 3) ensuring rock blocks to be in a state of triaxial stress is conducive to its stability and hence the stability of multiple tunnels.

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The Application of the Strength Reduction Shortest Path Method to the Stability Analysis of Shallow Buried Tunnel

Cited by 5 publications

References 21 publications

Study on stress and deformation characteristics of existing-new two-stage cantilever retaining wall

Study on stress and deformation characteristics of existing-new two-stage cantilever retaining wall

Surrounding Rocks Stability Analysis of Circular Tunnel Using Strength Reduction Method and Sliding-t Test

Construction risk control technology of a large tunnel complex in urban area

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