Development of the surface displacement velocity in a full-scale loamy model slope under multistep excavation

Sasahara, Katsuo; Hiraoka, Nobutaka; Kikkawa, Naotaka; Itoh, Kazuya

doi:10.1007/s10064-021-02226-1

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Yang et al (2019) modified the numerical manifold method (NMM) to investigate the stability of soil-stone mixture slopes under different sequential excavations. Similar studies include those by Zhang et al (2020), Jiao et al (2022), Sasahara et al (2021), Gao et al (2011), and Chen et al (Ma et al, 2020;Chen et al, 2022a;Chen et al, 2022b).…”

Section: Introductionsupporting

confidence: 53%

Failure mechanism and stability analysis of an open-pit slope under excavation unloading conditions

et al. 2023

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Excavation unloading significantly contributes to rock slope failure in an open-pit mine. At present, there is no relevant theoretical study on the failure mechanism of the rock slope under excavation unloading. Therefore, in this study, based on the theory of fracture mechanics, the expression of the stress intensity factor at the crack tip on the rock mass at the vertical distance, h, from the slope top under excavation unloading is derived, the calculation method of the crack initiation angle is given, the expression of the ultimate safe height of the slope under unloading is obtained, and the ratio of the fracture toughness of the slope rock mass to the composite stress intensity factor at the crack tip on the rock mass is defined as the slope stability factor, which is verified by an engineering example. The results show that the crack initiation angle decreased when crack inclination was increased, and the crack initiation angle increased when the side-pressure coefficient, slope angle, and friction coefficient were increased. The ultimate safety height of the slope decreased first and then increased with the increase in the crack angle, and it was approximately linear with the crack length and inversely proportional with the slope angle. The stability coefficient calculated by this method is the same as that calculated by the limit equilibrium method and is small, which indicates the accuracy and rationality of this method. Results in this study can provide a theoretical basis for understanding and controlling the slope collapse disaster induced by excavation unloading.

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Section: Introductionsupporting

confidence: 53%

Failure mechanism and stability analysis of an open-pit slope under excavation unloading conditions

et al. 2023

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“…The increase in the displacement was significant at first, and then the ratio of the increase in the displacement decreased until the termination of the displacement in this case. A decelerative increase and accelerative increase in the displacement under constant stress were also observed in the model slope under multistep excavation 9 . Both increases developed after the excavation in this experiment, which indicates that these were creep displacements under constant stress conditions.…”

Section: Introductionsupporting

confidence: 52%

Development of the shear displacement of sandy soil due to absorption under constant shear stress for creep failure

Sasahara

2022

Sci Rep

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Measurement of the displacement and pore pressure in physical model slopes and natural slopes revealed that not only an accelerative increase up to failure but also a decelerative increase occurred in surface displacement under a constant groundwater level, which could be recognized as creep deformation under constant stress. The displacement increased significantly at first in both types, which made it difficult to evaluate whether the displacement developed to the point of failure at the start of the increase. It was necessary to find an indicator for evaluation as the first step of the prediction of an onset of slope failure. Measurement of shear and normal displacements of the sandy specimen in an inclined direct shear box with increasing water content was conducted to examine the indicator. The increase in the shear displacement was categorized into three types: the accelerative increase up to failure with increasing volumetric water content (VWC), the accelerative increase up to failure under constant VWC just prior to failure, and the decelerative increase under constant VWC. It was recognized that a constant VWC corresponded to constant suction from the experimental data. Shear displacement increased up to failure with the monotonic decrease in void ratio just prior to failure in the case of increasing VWC. The void ratio monotonically decreased under constant VWC in the case of shear displacement termination under constant VWC, while it significantly varied at first and then converged to a constant value just prior to failure in the case of shear displacement increase with constant VWC. The ultimate void ratio under the same stress conditions might have been unique. These facts revealed that the void ratio can be recognized as an indicator of the failure of specimens under creep deformation according to absorption. When the void ratio converges to a constant value under constant VWC, the shear displacement might increase up to failure, while the void ratio varying under constant VWC indicates that the shear displacement terminates before failure.

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Prediction of the failure of a slope comprising weathered granite soil under multistep excavation based on multidimensional displacement measurements

Sasahara,

Katayama,

Ishihama

et al. 2024

Landslides

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Development of the surface displacement velocity in a full-scale loamy model slope under multistep excavation

Cited by 3 publications

References 18 publications

Failure mechanism and stability analysis of an open-pit slope under excavation unloading conditions

Failure mechanism and stability analysis of an open-pit slope under excavation unloading conditions

Development of the shear displacement of sandy soil due to absorption under constant shear stress for creep failure

Prediction of the failure of a slope comprising weathered granite soil under multistep excavation based on multidimensional displacement measurements

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