Seepage characteristics of a fractured silty mudstone under different confining pressures and temperatures

Fu, Hongxun; Jiang, Huangbin; Qiu, Xiang; Ji, Yunpeng; Chen, Wen; Zeng, Lingzao

doi:10.1007/s11771-020-4419-6

Cited by 23 publications

(3 citation statements)

References 24 publications

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“…e test specimens are obtained from the West 1 st coal mine of China Resources Power. e sampling depth is 310 m. According to the engineering geological data, the area is mainly composed of Cretaceous mudstone, which is characterized by poor cementation [28,29]. According to the color, there are grey mudstone and black mudstone, as shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Influence of Moisture Content on the Structural Characteristics of Argillaceous Weakly Consolidated Rock Caused by Dynamic Loading in the Coal Mine

Meng

Han

Zhu

et al. 2021

Shock and Vibration

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The argillaceous weakly consolidated rock is a kind of soft rock that will bring great difficulties in the construction process. Specimens of such rock under different moisture contents are taken as the research object. By the Hopkinson pressure bar test (SHPB), the structural and mechanical characteristics of the rock under dynamic impact are analysed. With increasing moisture content, the transmitted wave amplitude decreases gradually, which indicates that the higher the moisture content of the rock is, the easier it is to deform under dynamic impact and the greater its plasticity. The boundary between plastic failure and brittle failure is 10% moisture content. Through a mercury injection test, the porosity variation is analysed. The porosity of the rock decreases with increasing moisture content after the same dynamic impact. The porosity curve can be roughly divided into two sections with a moisture content of 15% as the boundary. Based on a uniaxial compression test, the elastic modulus, peak strength, and residual strength of specimens after dynamic impact are analysed, and the mechanical properties of the rock are revealed. Its mechanical properties can be divided into three sections with a moisture content of 9.18% and 15.19%, and each section has obvious differences.

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Section: Methodsmentioning

confidence: 99%

Influence of Moisture Content on the Structural Characteristics of Argillaceous Weakly Consolidated Rock Caused by Dynamic Loading in the Coal Mine

Meng

Han

Zhu

et al. 2021

Shock and Vibration

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“…The seepage tests for acquiring the SRM permeability coefficient have been plagued by the issues of large specimen size, difficulty in sample preparation, and long test period [6,7]. Modeling reasonable predictions of permeability coefficients has been the dominant approach [8].…”

Section: Introductionmentioning

confidence: 99%

Predicting permeability coefficient in soil-rock mixtures using parameters from the negative exponential continuous grading equation

Chen,

Zhang,

Zhou

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Soil-rock mixtures (SRMs) are widely utilized for embankment filling of highways in mountainous areas. The permeability characteristics of SRMs must be investigated as mountain highways are often exposed to strands of rainwater subjected to extreme rainfall. For the same species of SRM, its permeability is determined by its pore distribution and grading characteristics, which can be considered as an expression of particle grading and pore parameters. The predictive model of the SRMs permeability coefficient encompassing gradation coefficients and porosity was proposed based on the negative exponential continuous gradation equation and the Kozeny–Carman model. The applicability of the prediction model was verified based on the existing literature and performing SRMs seepage tests. The findings indicated that the permeability coefficient formula for SRMs established on the particle grading parameters and porosity was reasonable. Nevertheless, its current applicability is limited to the prediction of permeability coefficients for continuously graded SRMs. Consequently, further investigation is required to assess the suitability of the model for intermittently graded SRMs.

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“…For instance, during highway construction, as the rock mass is continuously excavated, the initial in situ stresses are “unloaded”, which may lead to the redistribution of stresses. This triggers unloading deformation and potential damage, including micro or macro cracks within the rock mass [ 1 , 2 , 3 , 4 ]; these consequences are similar to the well-known Excavation Damaged/Distributed Zone (EDZ) found in tunnel engineering. Over the past decade, there have been numerous landslides triggered by the failure of soft rock in China, such as the Anlesi landslide and the Dalixi landslide, the landslide that occurred in the Three Gorges Reservoir area, and the landslide that occurred along the Jinchuan–Xiaojin highway in Sichuan Province; these are typical examples of unloading deformation caused by mudstone cut slope excavation [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Study on the Strength and Failure Characteristics of Silty Mudstone Using Different Unloading Paths

Wang

Zhang

et al. 2023

Materials

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To investigate the strength and failure characteristics of silty mudstone using different stress paths, silt-like mudstone specimens were subjected to triaxial unloading tests. The results indicate the following. (1) When subjected to equivalent initial deviator stress levels and differing confining pressures, the peak stress, residual stress, and elastic modulus, exhibited during unloading, increased concordantly with greater initial confining pressure. Both the peak strain and residual strain increased with rising initial confining pressure. The increase in peak strain and residual strain initially decelerated, then noticeably increased, before ultimately decreasing again. Additionally, the unloading failure time and strain rate demonstrated a negative correlation as the confining pressure increased. (2) Under different initial deviatoric stress conditions, the peak stress, residual stress, and residual strain, under unloading confining pressure conditions, decreased as the initial deviatoric stress levels elevated. Conversely, the peak strain and elastic modulus initially increased, then decreased under increasing initial deviatoric stress conditions. The unloading failure time and strain rate were both observed to decrease as the initial deviatoric stress levels increased. (3) Utilizing the Mohr stress circle enabled the characterization of the shear strength variation in the specimens during the unloading process. The cohesion and internal friction angle remained relatively consistent across the different unloading stress paths appraised, with cohesion being greater in path I versus path II, whereas the internal friction angle exhibited an inverse relationship. (4) The specimen failed during unloading due to lateral expansion caused by unloading confining pressure and collapse failure. The failure fracture surfaces predominantly manifested shear failure morphologies.

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Seepage characteristics of a fractured silty mudstone under different confining pressures and temperatures

Cited by 23 publications

References 24 publications

Influence of Moisture Content on the Structural Characteristics of Argillaceous Weakly Consolidated Rock Caused by Dynamic Loading in the Coal Mine

Influence of Moisture Content on the Structural Characteristics of Argillaceous Weakly Consolidated Rock Caused by Dynamic Loading in the Coal Mine

Predicting permeability coefficient in soil-rock mixtures using parameters from the negative exponential continuous grading equation

Study on the Strength and Failure Characteristics of Silty Mudstone Using Different Unloading Paths

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