Nonlinear shear constitutive model for peak shear-type joints based on improved Harris damage function

Xie, Shijie; Lin, Hang; Wang, Yixian; Cao, Rihong; Rui, Yong; Du, Shigui; Li, Jiangteng

doi:10.1007/s43452-020-00097-z

Cited by 54 publications

(15 citation statements)

References 35 publications

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“…(2) Slip direction analysis. Due to the existence of anisotropy (Xie et al, 2020;Du and Tang, 1993), only the shear parameters along the slip direction of rock mass discontinuity reflect the shear strength of the slope.…”

Section: Accurate Assessment Of Geometry and Shear Strength Of Structure Planesmentioning

confidence: 99%

Multi-level and Precise Evaluation of Slope Stability in Large Open-pit Mines: a Case Study at Dexing Copper Mine, China

Shi-gui

Saroglou

Chen

et al. 2021

Preprint

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As the mining industry developed significantly in the last decades and the depth of open-pit mining has increased, the stability of large open-pit slopes has become a major problem directly related to the safety production and development of a mine. However, the overall slope is indeed safer than the local slope based on the existing stability estimation methods. So the existing methods of directly analyzing the stability of the overall slope will produce some errors in the calculation results of the safety factor, and cannot comprehensively reflect the stability of the mine slope. Based on these problems, this paper adopted the idea of gradual analysis and the precise determination of discontinuity properties to perform a limit equilibrium analysis for the evaluation of mine slope stability. A case study slope, referred to as Yangtaowu Slope in Dexing Copper Mine, was selected for the demonstration of the accuracy of this approach. The results indicate that the adopted method can accurately reflect the actual stability of the slope, especially when the mine slope is near the critical state of stability.

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Section: Accurate Assessment Of Geometry and Shear Strength Of Structure Planesmentioning

confidence: 99%

Multi-level and Precise Evaluation of Slope Stability in Large Open-pit Mines: a Case Study at Dexing Copper Mine, China

Shi-gui

Saroglou

Chen

et al. 2021

Preprint

Self Cite

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“…Loading. From the microscopic view, the failure of the rock microunit shows a certain randomness, which can be described by a statistical method [41,42]. Assuming the 4 Geofluids microunit strength satisfies the maximum tensile strain yield criterion and the damaged microunits obey the Weibull statistical distribution [43], the probability density function Pð εÞ is expressed as follows:…”

Section: Damage Evolution Equation Of Intact Rock Undermentioning

confidence: 99%

Damage Statistical Empirical Model for Fractured Rock under Freezing-Thawing Cycle and Loading

et al. 2020

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The natural rock mass prevailingly exists in the form of a fractured rock mass, and freezing-thawing failure of the fractured rock mass is also frequently encountered during geotechnical projects in cold regions. The previous researches and reports in freezing-thawing field principally focused on intact rocks, while rock joints and fractures were rarely considered, which causes great inconvenience to the safety design and stability assessment of engineering. In response to the special climatic conditions of cold regions, the freezing-thawing damage and degradation mechanism of fractured rock were studied in this paper based on existing laboratory experiments and damage mechanics theory. Primarily, a brief review of the progressive damage process of rock in the conventional triaxial compression experiment was given, as well as the determination methods of four characteristic stresses in the prepeak curve. Then, from the microcosmic perspective, the maximum tensile strain yield criterion was used to reflect the microunit strength which was assumed to statistically satisfy the Weibull distribution, deriving the damage evolution equation of fractured rock under the freezing-thawing cycle and load conditions and quantificationally describing the damage evolution law. Consequently, the statistical empirical constitutive relation of fractured rock considering freezing-thawing and loading damages was established. Ultimately, by combining the existing conventional triaxial compression experimental data of freezing-thawing single fractured rocks with the determination methods of characteristic stresses, the relevant constitutive parameters were solved, and the theoretical constitutive relation curves of the fractured rock after freezing-thawing cycles were obtained, which were compared with the experimental results to verify the validity of the established empirical constitutive relation. The study findings can provide a theoretical basis for revealing the freezing-thawing failure mechanism of the fractured rock mass to some extent.

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“…e stability of geotechnical materials is affected by many factors [19][20][21][22][23]. In order to ensure the stability of the foundation pit itself and the surrounding environment as well as the pile-anchor retaining structure, dynamic monitoring is widely used as an effective means [24].…”

Section: Introductionmentioning

confidence: 99%

Displacement Monitoring during the Excavation and Support of Deep Foundation Pit in Complex Environment

Li¹

2021

Advances in Civil Engineering

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Taking a super large deep foundation pit project as an example, the horizontal displacement of crown beam and driveway, surface settlement, axial force of anchor cable, and underground water level in the construction process of the foundation pit are dynamically monitored and analyzed. The excavation deformation rule of the deep foundation pit and the influence of excavation on surrounding buildings are analyzed. The results show that, with the excavation of the foundation pit, the crown beam and driveway of the foundation pit incline towards the direction of the pit and eventually tend to be stable. The variation of axial force of the prestressed anchor cable in the first layer of the foundation pit is basically consistent with the variation of horizontal displacement time history. The variation trend of the groundwater level at each side of the foundation pit is different but tends to be stable in a short time. In the whole monitoring period, the cumulative settlement value of each area of the foundation pit is within the controllable range, but the surface settlement of the north side of the foundation pit and a surrounding building has not reached stability, so it is suggested to extend the monitoring time of settlement in the relevant area.

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Nonlinear shear constitutive model for peak shear-type joints based on improved Harris damage function

Cited by 54 publications

References 35 publications

Multi-level and Precise Evaluation of Slope Stability in Large Open-pit Mines: a Case Study at Dexing Copper Mine, China

Multi-level and Precise Evaluation of Slope Stability in Large Open-pit Mines: a Case Study at Dexing Copper Mine, China

Damage Statistical Empirical Model for Fractured Rock under Freezing-Thawing Cycle and Loading

Displacement Monitoring during the Excavation and Support of Deep Foundation Pit in Complex Environment

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