Slope stability analysis with modified shear strength reduction technique

Cała, M.; Flisiak, J.; Tajduś, A.

doi:10.1201/b16816-160

Cited by 13 publications

(8 citation statements)

References 1 publication

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“…However the Finite Difference Method code FLAC3D provides the opportunity to analyse several slip surfaces using the modified shear strength reduction technique -MSSR (Cała & Flisiak, 2003;Cała et al, 2004).…”

Section: Slope Stability Analysis With 3d Numerical Calculationsmentioning

confidence: 99%

The Three-Dimensional (3D) Numerical Stability Analysis of Hyttemalmen Open-Pit

Cała¹,

Kowalski²,

Stopkowicz³

2014

Archives of Mining Sciences

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The purpose of this paper was to perform the 3D numerical calculations allowing slope stability analysis of Hyttemalmen open pit (location Kirkenes , Finnmark Province, Norway). After a ramp rock slide, which took place in December 2010, as well as some other small-scale rock slope stability problems, it proved necessary to perform a serious stability analyses. The Hyttemalmen open pit was designed with a depth up to 100 m, a bench height of 24 m and a ramp width of 10 m. The rock formation in the iron mining district of Kirkenes is called the Bjornevaten Group. This is the most structurally complicated area connected with tectonic process such as folding, faults and metamorphosis. The Bjornevaten Group is a volcano-sedimentary sequence. Rock slope stability depends on the mechanical properties of the rock, hydro-geological conditions, slope topography, joint set systems and seismic activity. However, rock slope stability is mainly connected with joint sets. Joints, or general discontinuities, are regarded as weak planes within rock which have strength reducing consequences with regard to rock strength. Discontinuities within the rock mass lead to very low tensile strength. Several simulations were performed utilising the RocLab (2007) software to estimate the gneiss cohesion for slopes of different height. The RocLab code is dedicated to estimate rock mass strength using the Hoek-Brown failure criterion. Utilising both the GSI index and the Hoek-Brown strength criterion the equivalent Mohr-Coulomb parameters (cohesion and angle of internal friction) can be calculated. The results of 3D numerical calculations (with FLA3D code) show that it is necessary to redesign the slope-bench system in the Hyttemalmen open pit. Changing slope inclination for lower stages is recommended. The minimum factor of safety should be equal 1.3. At the final planned stage of excavation, the factor of safety drops to 1.06 with failure surface ranging through all of the slopes. In the case of a slope angle 70° for lower stages, FS = 1.26, which is not enough to provide slope stability. Another series of calculations were therefore performed taking water table lowering into consideration, which increases the global safety factor. It was finally evaluated, that for a water table level of 72 m the factor of safety equals 1.3, which is enough to assure global open-pit stability.

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Section: Slope Stability Analysis With 3d Numerical Calculationsmentioning

confidence: 99%

The Three-Dimensional (3D) Numerical Stability Analysis of Hyttemalmen Open-Pit

Cała¹,

Kowalski²,

Stopkowicz³

2014

Archives of Mining Sciences

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“…Dawson calculated safety factor of a homogeneous dam (1999); Matsui(1992) studied safety factor variation before and after excavation of a slope; Dawson(2000) studied the slope sliding with cantilevered and gravity retaining walls. Based on previous work, some of the more complex issues are also included in the scope of the Strength Reduction Method: Chen (2006) analyzed the applicability of the rock wedge landslide; Cala (2004) studied the multi-slope stability, explores various possible slip surfaces; Cheng (2007)studied the multi-stage slope stability containing weak intercalation. Zheng (2004) the first studied applying the Strength Reduction Method in tunnels and underground engineering.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis by Strength Reduction Method in Shallow Buried Tunnels

Xia

Zhao

Zhang

et al. 2014

Tunneling and Underground Construction

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Shallow buried tunnels are commonly seen in engineering practice. To understand the failure mechanism of shallow buried tunnel is of significance in engineering practice. There is a reasonable judging index lacking in tunnel stability. The strength reduction method (SRM) gain limiting status of geotechnical materials by reducing the computation parameters. Then the failure zone can be obtained and showed. Finally, a safety factor can be obtained by this progress. This method has been used in slope stability analysis. The usage of this method is a new field. Based on shallow tunnel computation model under different cover depth, the SRM method is adopted in finding the safety factor of shallow buried tunnels. The displacement curve changing with the strength reduction factor is drawn and the catastrophe point is found as the safety factor. Further, by compared with the failure criteria of plastic zone connection and non-converge, also, compared with model tests, failure mechanism of shallow buried is analyzed. Specialty of these safety factors is discussed and it is proved that they maintain a accordance. This research is of significance for tunnels safety factors' study.

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“…Nevertheless, there are some weaknesses associates with such methods which seek the failure sate by strength reduction technique based on iterative analyses. Application of strength reduction technique requires advanced numerical modelling skills and calculation time, and in case of complicated models, can last as long as several hours [9].…”

Section: Introductionmentioning

confidence: 99%

Continuous Slip Surface Method for Stability Analysis of Heterogeneous Vertical Trenches

2019

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Evaluating the reliability of trenches against sliding failure is complicated by the fact that most alluvial deposits are heterogeneous and spatially variable. This means that instead of perfectly circular or linear failure surfaces, trench failure tends to be more complex, following the weakest path or zones through the material, thereby, a new method named Continuous Slip-Surface (CSS) is adopted for calculating the critical excavation depth.CSS runs an algorithm to seek for continuous slip surface. The Finite Difference Method (FDM) coupled with random field theory and CSS method is well suited to slope stability calculations since it allows the failure surface to seek out the weakest path through the soil. For an unsupported vertical cut, it was shown that the critical excavation depth acquired from CSSM is indeed an upper bound solution. It was further shown both numerically and analytically through an idealized variation model that increasing the undrained shear strength density fades the effect of shear strength variability. Correlation structure of the input variable was also shown to influence the results, although the behaviour was found different in low and high scales of fluctuation.

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Slope stability analysis with modified shear strength reduction technique

Cited by 13 publications

References 1 publication

The Three-Dimensional (3D) Numerical Stability Analysis of Hyttemalmen Open-Pit

The Three-Dimensional (3D) Numerical Stability Analysis of Hyttemalmen Open-Pit

Stability Analysis by Strength Reduction Method in Shallow Buried Tunnels

Continuous Slip Surface Method for Stability Analysis of Heterogeneous Vertical Trenches

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