Nonproportional Correlative Reduction Finite Element Method for Slope Strength Parameters

Xue, Haibin; Dang, Faning; Yin, Xiaokang; Ding, Wenjiang; Yang, Canjun

doi:10.1155/2016/2725354

Cited by 18 publications

(13 citation statements)

References 16 publications

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“…The cohesion and internal friction angle are then reduced in a synchronous and coordinated manner. Referring to Xue et al [34], it is assumed that the trend in the reduction of the double parameters is based on the linear softening model, which considers the strength parameter and the softening parameter to be piecewise linear functions. The softening parameter is set to η, and the strength parameter is the cohesion and the internal friction angle.…”

Section: Principle Of the Nscr Methodsmentioning

confidence: 99%

“…Isakov and Moryachkov [33] established an equation of the relationship between the integrated safety factor and the strength reduction path. Afterwards, Xue et al [34] proposed a double-parameter non-proportional strength reduction method based on the finite element method. They established a non-proportional reduction relationship between double-strength parameters, assuming that the cohesion c and the internal friction angle ϕ decay linearly.…”

Section: Introductionmentioning

confidence: 99%

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Research on a Non-Synchronous Coordinated Reduction Method for Slopes Based on the Hoek–Brown Criterion and Acoustic Testing Technology

He,

Zhao,

Yin

et al. 2023

Sustainability

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In the process of the evolution of rocky slope instability, the decay deterioration rate of cohesion c and internal friction angle φ are different, and there are also differences in the order and degree of their impact on slope stability; thus, it is of great theoretical value to propose a more practical calculation method for the reduction in slope degradation. This paper combines the Hoek–Brown criterion and an acoustic test method to estimate the mechanical parameters of slope rock mass; the correlative relationship within the double-strength parameter reduction was established by introducing advanced reduction steps (ARS), n, and correlation factor, λ, and a non-synchronous coordinated reduction (NSCR) method for the double parameters of slopes was proposed. Furthermore, methods for determining the comprehensive safety factor (CSF) of slopes during the coordinated reduction of double parameters are comparatively analyzed. The results of the application of engineering examples show that the strength of the slope rock mass is significantly reduced after several blast disturbances, and the equivalent cohesion is reduced from 1.05 MPa to 0.89 MPa, while the internal friction angle is reduced from 25.68° to 21.77°. The CSF calculated using the W. Yuan-2 method is closer to the results of the limit equilibrium method and is suitable for the calculation of the CSF of the NSCR of slopes. The slope CSFs show a trend of first increasing and then decreasing with the increase in n; FS = 3.349 when n = 50, with a relative error of only 8.1% compared to the results calculated using the limit equilibrium method. The NSCR method remediates the blindness of the traditional strength reduction method in double-parameter reduction and ensures that the reduction range of the internal friction angle is no lower than its residual strength limit value, making it practical and feasible for slope stability analysis.

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Section: Principle Of the Nscr Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on a Non-Synchronous Coordinated Reduction Method for Slopes Based on the Hoek–Brown Criterion and Acoustic Testing Technology

He,

Zhao,

Yin

et al. 2023

Sustainability

View full text Add to dashboard Cite

show abstract

“…Strength reduction method (SRM) was first proposed by Zienkiewicz et al in 1975 and used for slope stability analysis [19]. And then, many scholars have done a lot of work on the applicability and feasibility of SRM in slope stability analysis, such as Ugai [20], Matsui and San [21], Griffiths and Lane [22], and Dawson [23] et al For the whole safety storage of the slope based on the double safety factors, nonproportional correlative reduction finite element method with the contribution of the shear strength parameter to the sliding resistance force as weight is proposed by Xue et al [24]. A parallel-local strength reduction method is proposed by Zhang et al [25], which is based on the idea of the local strength reduction method.…”

Section: Introductionmentioning

confidence: 99%

Study on the Characteristics of Self‐Stabilizing Height Distribution for Deep Foundation Pit Vertical Sidewall in Binary Strata of Upper Soil and Lower Rock

Zhang

Zhang²,

et al. 2021

Advances in Civil Engineering

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The self-stability height of the foundation pit sidewall is an important criterion for evaluating the safety degree and designing the supporting structure. The strength reduction elastic-plastic finite element numerical calculation method has been adopted in this paper. Based on comparative analysis of the stability characteristics for deep foundation pit in binary strata of upper soil and lower rock under multiple working conditions, the potential fracture surface of deep foundation pit and the evolution law of corresponding safety factor have been revealed under different Hs and H. A new idea that the vertical soil sidewall height (Hs) and the vertical rock sidewall height (Hr) are used as two independent evaluation indexes, respectively, for deep foundation pit stability in binary strata of upper soil and lower rock has been put forward. The distribution characteristics and variation law of Hs0 and Hr0 under different Hs and different H have been revealed, respectively. The spatial distribution map of the self-stabilizing height for deep foundation pit vertical sidewall in upper soil and lower rock binary stratum has been constructed, and the mathematical fitting equation between Hr0 and Hs has been obtained. Finally, combined with the implementation effect of the deep foundation pit project of Ningxia Road Station for Qingdao Metro Line 3, the rationality of the conclusions is verified. The research results provide theoretical basis for quickly determining the self-stability characteristics of foundation pit vertical sidewall.

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“…Yuan et al [17,18] studied the proportional relationship between the two reduction factors for different slopes in combination with a computational example and provided two methods of defining the comprehensive safety factor. Xue et al [19] established a nonproportional relationship between the cohesion reduction factor and the friction angle reduction factor for the case in which the strength parameter distribution obeys the linear attenuation assumption. Xu et al [20] proposed a water content variation impact-based method for determining the double strength reduction coefficient.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of a Weathered‐Basalt Soil Slope Using the Double Strength Reduction Method

Chen

Zhang

et al. 2021

Advances in Civil Engineering

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Slope stability analysis of the mountain landforms in southwestern China has always been an important problem in the field of geotechnical engineering. The large landslide occurs in Jichang Town, Shuicheng County, Guizhou Province, China, on July 23, 2019, as the engineering background. Based on the nonlinear relationship between the soil water content, cohesion, and friction angle measured in laboratory tests, the finite element reduction problem of the double-strength parameters is only transformed into a reduction problem of water content. Then, based on the redevelopment platform in the ABAQUS finite element software, a user subroutine to specify predefined field variables (UFIELD) was written to numerically simulate the stability of the Jichang slope before the landslide. The results show that the Jichang slope is mainly composed of basalt-weathered red clay mixed with gravel of various particle sizes. The underlying bedrock is primarily the Permian Emeishan basalt with strong-to-weak weathering and a small amount of argillaceous siltstone. Due to the increase in water content caused by heavy rainfall, the strength of the soil decreased continuously. Once the critical stress state of the slope was exceeded, the plastic sliding block slipped at high speed over a long distance along the rock-soil layer interface, and along the way, it scraped out and carried away the original loose topsoil and gravel blocks, which finally piled up in the form of a debris flow. In addition, the attenuations of the cohesion and friction angle are different. When the water content is less than 25%, the reduction coefficient of the friction angle is greater than the cohesion, which shows that the attenuation of the friction angle is stronger than that of the cohesion. The opposite is true when the water content is greater than 25%. The new method of double-strength finite element reduction presented in this paper is reasonable and feasible and is more in line with the actual situation of weathered-basalt soil slope instability in heavy rainfall areas.

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Nonproportional Correlative Reduction Finite Element Method for Slope Strength Parameters

Cited by 18 publications

References 16 publications

Research on a Non-Synchronous Coordinated Reduction Method for Slopes Based on the Hoek–Brown Criterion and Acoustic Testing Technology

Research on a Non-Synchronous Coordinated Reduction Method for Slopes Based on the Hoek–Brown Criterion and Acoustic Testing Technology

Study on the Characteristics of Self‐Stabilizing Height Distribution for Deep Foundation Pit Vertical Sidewall in Binary Strata of Upper Soil and Lower Rock

Stability Analysis of a Weathered‐Basalt Soil Slope Using the Double Strength Reduction Method

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