A study on altered granite meso-damage mechanisms due to water invasion-water loss cycles

Qin, Zhe; Fu, Houli; Chen, Xuxin

doi:10.1007/s12665-019-8426-6

Cited by 82 publications

(30 citation statements)

References 12 publications

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“…The buoyant effect and saturated shear strength could also be considered and incorporated in the calculation of FOS, which is based on statics. However, the effect of rainfall on the slope stability is much more complicated [34][35][36][37], especially for unsaturated soil. Dynamic processes, such as seepage and the variation in pore water pressure from rainfall, affect the slope stability.…”

Section: Resultsmentioning

confidence: 99%

Forecasting Landslides via Three-Dimensional Discrete Element Modeling: Helong Landslide Case Study

Peng

Song

et al. 2019

Applied Sciences

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Forecasting the occurrence potential of landslides is important but challenging. We aimed to forecast the failure potential of the Helong landslide, which is temporarily stable but has clearly deformed in recent years. To achieve the goal, we used reconnaissance, remote sensing, drilling, laboratory tests, topographical analysis, and electrical resistivity tomography (ERT). The factor of safety (FOS) of the slope was first calculated using a limit equilibrium method. The results show the FOS of the slope was 1.856 under natural conditions, 1.506 under the earthquake conditions, 1.318 under light rainfall, 0.986 under heavy rainfall, 1.075 under light rainfall and earthquake, and 0.832 under simultaneous heavy rainfall and earthquake. When the FOS is less than 1.35, the slope is considered metastable according to the Technical Code for Building Slope Engineering (GB50330-2013) published by the Chinese Ministry of Housing and Urban-Rural Development. Based on the drilling data and digital elevation data, a three-dimensional discrete element method (DEM) model was used to simulate potential landslides. The simulation was used to examine catastrophic slope failure under heavy rainfall conditions within a range of friction coefficients and the corresponding affected areas were determined. Then, we analyzed a typical run-out process. The dynamic information of the run-out behavior, including velocity, run-out distance, and depth, were obtained, which is useful for decision support and future landslide hazard assessment.

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Section: Resultsmentioning

confidence: 99%

Forecasting Landslides via Three-Dimensional Discrete Element Modeling: Helong Landslide Case Study

Peng

Song

et al. 2019

Applied Sciences

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“…Tunnels and underground projects are often in a complex and special environment, in which soft rock has mechanical media with significant and complex deformation. Large deformation of weak surrounding rock leads to geological disasters, which brings about a series of special problems to the design and construction of tunnels and other related underground projects [7][8][9][10][11][12]. He et al divide the large deformation into the elastic large deformation and the plastic large deformation and divide the soft rock into the stress dilatancy type, the physical and chemical expansion type, and the structural deformation type, and they divide them into four grades according to the severity [13,14].…”

Section: Introductionmentioning

confidence: 99%

Study on Deformation Mechanism and Support Measures of Soft Surrounding Rock in Muzhailing Deep Tunnel

Tao

Cao

Liu

et al. 2020

Advances in Civil Engineering

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The deformation of Muzhailing deep tunnel is about 2.3 m in the process of construction, which is difficult to be controlled by the traditional “anchor-grouting integration” support system. This paper deeply analyzes the geological characteristics, rock mechanics characteristics, and surrounding rock failure characteristics of Muzhailing tunnel. The deformation mechanism and the failure of the support system are analyzed through the numerical simulation, theoretical analysis, and field test. The authors propose support measures suitable for Muzhailing tunnel based on the analysis results. The maximum buried depth is 600 m, and the engineering rock mass at the depth has nonlinear physical and mechanical phenomenon. The maximum principal stress of Muzhailing tunnel is 25.7 MPa, which belongs to high-stress joint swelling soft rock tunnel. The NPR cable can achieve large deformation under the condition of constant support resistance. The authors put forward the coupling support mode of “NPR cable + steel arch frame + concrete,” which is based on the idea of transforming the composite deformation mechanism to a single type. The stress concentration appears in the range of 12 m in the surrounding rock circle, and the lateral and vertical stress distributions are relatively symmetrical after the improved support. The circumferential strain of the surrounding rock is greatly reduced, and the range of strain is reduced by 10%. The field monitoring results show that the new support system can well control the large soft rock deformation of Muzhailing tunnel (0.5 m). The support strategy proposed can effectively control the large deformation and promote the formation of new support concept for deep tunnel.

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“…Under the blasting, rainfall, and human activity, the rock mass of slope weakens, causing a large number of engineering disasters [1][2][3][4][5][6]. e disaster because of large deformation during a landslide in an open-pit mine not only causes huge economic losses but also seriously threatens the safety of life and property of the staff in the mine.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of NPR Anchorage Monitoring of Bedding Rock Landslide in Open‐Pit Mine

Zhang

Yang

Cui

et al. 2020

Advances in Civil Engineering

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Nanfen open-pit iron mine is the largest single open-pit mine in Asia. Because of the lag of the extension project, the section has slowly spread in the shape of "V," and disasters such as landslides occur frequently. In this study, first, the NPR anchor cable monitoring, which shows supernormal mechanical characteristics and can realize the monitoring and early warning target for the whole landslide process and early warning curve of bedding rock "2016-1101 landslide" in the lower wall of Nanfen open-pit mine, was analyzed, revealing the failure process of the bedding rock landslide and the force evolution characteristics of the NPR anchor cable. en, based on the Fish language in FLAC3D and 3DEC software, the mechanical model of the NPR anchor cable was constructed, and numerical simulation was performed on the whole process of "16-1101 landslide" induced by accumulation of old landslide body. e results of this study indicate that the stress monitoring curves and failure characteristics of the NPR anchor cables in the whole process of landslide by the two numerical simulation methods are basically consistent with the field measurement results, providing a theoretical and practical basis for the mechanistic analysis and numerical simulation of other similar slopes.

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A study on altered granite meso-damage mechanisms due to water invasion-water loss cycles

Cited by 82 publications

References 12 publications

Forecasting Landslides via Three-Dimensional Discrete Element Modeling: Helong Landslide Case Study

Forecasting Landslides via Three-Dimensional Discrete Element Modeling: Helong Landslide Case Study

Study on Deformation Mechanism and Support Measures of Soft Surrounding Rock in Muzhailing Deep Tunnel

Numerical Simulation Analysis of NPR Anchorage Monitoring of Bedding Rock Landslide in Open‐Pit Mine

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