Effects of confining pressure on deformation failure behavior of jointed rock

Chen, Miao; Zang, Chuanwei; Ding, Ziwei; Zhou, Guanglei; Jiang, Bangyou; Zhang, Guangchao; Zhang, Chengpeng

doi:10.1007/s11771-022-4991-z

Cited by 44 publications

(20 citation statements)

References 44 publications

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“…The stress applied process was displacement loading, and the quasistatic loading state was maintained. The samples all failed within 5-15 min [35,36].…”

Section: Effect Of Water Content On Shale Strengthmentioning

confidence: 95%

Analysis of Anisotropic Strength and Wellbore Unstable Zone in Shale Formation Relating to Water Content

2023

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During oil and gas exploitation, wellbore stability has always been the focus of many scholars. Instability of wellbore will lead to washouts, breakout, stuck pipe, mud loss, and so on, even the abandon of the well. Shale rock is widely distributed in nature and must be taken into account in some rock engineering applications. In order to evaluate the strength anisotropy and the influence of moisture content of the wellbore integrity, the LMX outcrops are divided into three groups to carry out triaxial strength experiment. Based on the fitting method of collaborative search, the strength parameters of different moisture contents are determined; then, the effect of strength anisotropy and the moisture content of the LMX reservoir on wellbore collapse pressure and wellbore integrity are investigated. The results show that shale strength, especially cohesion, is more sensitive to the influence of water. With the increase of water content, the inclination angle of the minimum value obtained by shale strength is deviated to the left, and the collapse pressure and instability area increase significantly. At the same time, it is necessary to adjust the direction of borehole drilling to avoid the occurrence of the zone of bedding slip instability in the direction of the minimum in situ stress, and the inversion of in situ stress should be corrected by considering the effect of bedding on the location of the maximum in situ stress. The study on the effects of bedding and water content on the instability zone can provide suggestions and guidance for the optimization of borehole trajectory, the control of bottom hole safety pressure, the inversion of in situ stress, and the drilling and completion of wells.

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“…The stress applied process was displacement loading, and the quasistatic loading state was maintained. The samples all failed within 5-15 min [35,36].…”

Section: Effect Of Water Content On Shale Strengthmentioning

confidence: 95%

Analysis of Anisotropic Strength and Wellbore Unstable Zone in Shale Formation Relating to Water Content

2023

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“…The movement combination of the rock formation is determined by the strength factors of each rock formation (including lithology, thickness, and elastic modulus). The upper layers with low strength factors will move simultaneously with the lower layers with high strength factors and have the same sinking curvature, while the upper layers with high strength factors will gradually delaminate from the lower layers with low strength factors [21,22].…”

Section: Analysis Of Combined-strata Structure In Working Facementioning

confidence: 99%

Research on the Height of the Water-Conducting Fracture Zone in Fully Mechanized Top Coal Caving Face under Combined-Strata Structure

et al. 2022

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In order to study the development height of the water-conducting fracture zone in a fully mechanized top coal caving face. The E2311 working face of Gaohe Coal Mine was chosen as the research object, and the combined-strata structure and the rock layer synergistic movement mechanism were determined by combining engineering geological investigation and theoretical analysis. The height of the water-conducting fracture zone at the working face was calculated based on the combined-strata structure, and then the theoretical results were verified by numerical simulation and field measurement. The results show that after the coal seam is extracted from the working face, the movement of the overlying rock layers is in the form of bending and sinking movement of the rock layer group as a unit. Each rock layer group is controlled by a supportive lower layer with greater thickness and strength, driving the upper layers of weaker rock layers to synchronize and coordinate the movement; the sinking curvature is the same, after the lowermost support layer is bent and broken, its overlying weaker rock layers will move and break at the same time. The height of the water-conducting fracture zone of the working face were obtained by theoretical calculation, numerical simulation, and field measurements, which are 83.82 m, 84.3 m, and 86.6 m, respectively. The results are nearly consistent, thus the prediction of the height of the water-conducting fracture zone under the combined-strata structure is more accurate.

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“…Pan (2021) et al [23] studied the influence of joint angles on dynamic response characteristics of rock materials, such as dynamic strength, energy dissipation, and microscopic damage. Chen (2022) et al [24] performed a numerical simulation of joints under different rock static pressure carried out by a discrete element program, and the influence of joint inclination and static rock pressure on stress and strain curves, rupture patterns, and contact force distribution of joint specimens is revealed. Wang (2023) et al [25] tested the cyclic loading and unloading of jointed sandstone with different limit stress ratios, and it is proposed that when the limit stress ratio of jointed sandstone is greater than or equal to 0.90, jointed sandstone is damaged during circulation and fatigue frequency decreases with the increase of limit stress ratio.…”

Section: Introductionmentioning

confidence: 99%

Calculation method of HJC constitutive model parameters of natural joint angle slate

Wan

Tao

Tian

et al. 2023

Preprint

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In the course of underground engineering, geological conditions of layered slate are often encountered. Understanding the mechanical characteristics of layered slate is a prerequisite for engineering construction and disaster prevention and mitigation. As a result, at the beginning of the project, a large number of indoor tests were required, which is time-consuming and laborious. At the same time, the natural joint angle of the layered slate is random, so it is extremely difficult to establish a database of the mechanical characteristics of the layered slate. Therefore, it is urgent to find a simple and feasible method to determine the mechanical characteristics of the layered slate at a natural dip angle. Static test, Split-Hopkinson-Pressure-Bar (SHPB) test, and sensitivity analysis method are used in this paper. Taking five special joint angles (0 °, 30 °, 45 °, 60 °, 90 °) slate as the research object, the calculation method of Holmquist-Johnson-Cook (HJC) constitutive model parameters of natural joint angle slate are constructed, and the relationship between the HJC model parameters and the joint dip angle of slate is deduced. The results will provide a simple and feasible numerical simulation method for slate dynamics analysis.

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Effects of confining pressure on deformation failure behavior of jointed rock

Cited by 44 publications

References 44 publications

Analysis of Anisotropic Strength and Wellbore Unstable Zone in Shale Formation Relating to Water Content

Analysis of Anisotropic Strength and Wellbore Unstable Zone in Shale Formation Relating to Water Content

Research on the Height of the Water-Conducting Fracture Zone in Fully Mechanized Top Coal Caving Face under Combined-Strata Structure

Calculation method of HJC constitutive model parameters of natural joint angle slate

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