Experimental study on seepage characteristics of microfracture with different aperture

Zhang, Shuai; Qiao, Weiguo; Wu, Yue; Fan, Zhichao; Zhang, Lei

doi:10.1038/s41598-020-62350-y

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…e critical value of the unloading stress should be much greater than the compressive strength under uniaxial compression and less than the compressive strength of the three-axis test under the corresponding confining pressure [14].…”

Section: Process Of Simulationmentioning

confidence: 98%

Study on Fracture and Permeability Characteristics of Unloading Rock with High Water Pressure

Cui

et al. 2021

Mathematical Problems in Engineering

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Research on the damage and seepage characteristics of unloading rock with high water pressure can help to further understand the mechanism of water inrush in deep mine floor and prevent water inrush. This paper used the RFPA2D-flow finite element software to study the failure and seepage characteristics of unloading rock with high water pressure and high stress and comparatively analyzed the failure modes and seepage characteristics of unloading rock with and without water pressure. The effects of different water pressure differences on the failure of unloading rock and the law of seepage were investigated by analyzing the change of acoustic emission and permeability coefficient with stress. The results showed that the unloading rock without water pressure was brittle failure, and the initial damage of the unloading model with water pressure was earlier than that of the model without water pressure and showed greater brittleness, and its cracks first break through at the bottom of the sample with higher osmotic pressure. With the increase in unloading, the permeability of rock increased gradually until it appeared an abrupt change. The failure mode and permeability law of the rock with different water pressure differences were basically the same, but the greater the pressure difference, the smaller the effective unloading capacity when the permeability coefficient changes suddenly, and the greater the possibility of water inrush in the rock.

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Section: Process Of Simulationmentioning

confidence: 98%

Study on Fracture and Permeability Characteristics of Unloading Rock with High Water Pressure

Cui

et al. 2021

Mathematical Problems in Engineering

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“…Sandstone samples were obtained by onsite drilling and the rock mechanical parameters of the intact sandstone were obtained using a TAW-2000 computer controlled electro-hydraulic servo rigid pressure testing machine. According to the laboratory test data and field engineering investigation results, the GSI (geological strength index) [23][24][25] of the surrounding rock ranges between 42 and 48. The Hoek-Brown strength parameters are converted into equivalent Mohr-Coulomb peak and residual strength parameters 26 .…”

Section: Secondary Development Of the Anchor Failure Model The Cable ...mentioning

confidence: 99%

Investigation of the support constraint effect and failure instability law of tunnels constructed using the New Austrian tunneling method

Chen

Wang

Sun

et al. 2022

Sci Rep

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The application of a reasonable numerical calculation method is the key to accurately analyzing tunnel rock-support interactions. In this paper, we address the support constraint effect of tunnels and analyze the influence of related factors based on the confinement convergence method. Rupturable support models are developed using FLAC3D to intuitively show the numerical calculation results of tunnels. The results imply that the virtual supporting force generated by the support constraint effect should be considered in two-dimensional rock tunnel model calculations, and that the supporting force of the support should be increased by 2–3% of the maximum supporting force. Boundary effects should be considered in the three-dimensional tunnel model calculations, in which the influence range of the model boundary effect is nearly 1.5 times the tunnel span. A comparison of the field monitoring data and numerical calculations of the Baoshan tunnel project shows that the numerical results that consider the support constraint effect are in better agreement with the actual project situation. The rupturable support models can also reflect the stress and failure evolution law of supports, and provide support for the accurate evaluation of tunnel engineering stability.

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“…Earlier researchers have predominantly investigated soil erosion of loess and collapsed hills; however, there have been very few studies on the special clay gravel layers of the Anqing group. Currently, research on soil erosion is focused on studying the influence of rainfall intensity and slope on the development of rills and rill characteristics of the soil slopes [1,2]. The development of rill networks varies [3,4], and trichomonas point, rill head extension time, and average head erosion rate are representative indicators that reflect rill development better than the other indicators [5].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Model Tests on Flow Erosion Failure Mechanism of a Slope Consisting of Anqing Group Clay Gravel Layer

Huang

Haipeng

et al. 2021

Geofluids

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The Anqing group clay gravel layer is a special geological body composed of gravel and clay. In excavation projects, involving this soil, such a gravel layer, is prone to slope collapse and instability under the influence of rainfall. To clearly understand the failure mechanism and influencing factors of clay gravel slopes, an indoor artificial rainfall erosion model testing was carried out to analyse the effect of various slope ratios, gravel contents, and rainfall intensities. The slope erosion damage form, runoff rate, infiltration rate, scoured material, and slope stability of the clay gravel slope were studied. The test results show that sloping surfaces of the gentle slope were mainly damaged by erosion, and the degree of damage gradually increased from the top to the bottom of the sloping surface; however, the stability of the surface was good. In the case of the sloping surface layer of the steep slope, large-scale landslides occurred, and the stability of the surface was poor. When the gravel content was small, the surface failure was manifested as a gully failure. When the gravel content was large, it was manifested as a “layer-by-layer sliding” failure. The degree of influence of different conditions on the stable runoff rate was as follows: rainfall intensity>slope ratio>gravel content. The degree of influence of the parameters on the stable infiltration rate was as follows: slope ratio>rainfall intensity>gravel content. On gentle slopes, the total mass of the scoured material was inversely proportional to the gravel content and directly proportional to the rainfall intensity; on a steep slope, the total mass of the scoured material increased with an increase in the rainfall intensity and gravel content. Moreover, the slope ratio was the key influencing factor to decide whether there was gravel in the scoured material.

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Experimental study on seepage characteristics of microfracture with different aperture

Cited by 8 publications

References 28 publications

Study on Fracture and Permeability Characteristics of Unloading Rock with High Water Pressure

Study on Fracture and Permeability Characteristics of Unloading Rock with High Water Pressure

Investigation of the support constraint effect and failure instability law of tunnels constructed using the New Austrian tunneling method

Laboratory Model Tests on Flow Erosion Failure Mechanism of a Slope Consisting of Anqing Group Clay Gravel Layer

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