Deformation Mechanism and Control Technology of the Surrounding Rock of the Floor Roadway under the Influence of Mining

Zhao, Qingchong; Fu, Baojie; Yin, Jiadi

doi:10.1155/2020/6613039

Cited by 8 publications

(9 citation statements)

References 21 publications

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“…Roadway instability and collapse are primarily caused by plastic zone formation and growth. Zhao 26 calculated the implicit equation of the circular roadway's plastic zone boundary in a non‐axisymmetric stress field (Figure 1):

A_{1} {(\frac{a}{r})}^{8} + A_{2} {(\frac{a}{r})}^{6} + A_{3} {(\frac{a}{r})}^{4} + A_{4} {(\frac{a}{r})}^{2} + A_{5} = 0 A_{1} = 9 {false(1 - λ false)}^{2} A_{2} = - 12 {false(1 - λ false)}^{2} + 6 {false(1 - λ false)}^{2} \cos 2 θ A_{3} = 10 {false(1 - λ false)}^{2} \cos^{2} 2 θ - 4 {false(1 - λ false)}^{2} \sin^{2} φ \cos^{2} 2 θ - 2 {false(1 - λ false)}^{2} \sin^{2} 2 θ - 4 (1 - λ^{2}) \cos 2 θ + {false(1 + λ false)}^{2} A_{4} = - 4 {false(1 - λ false)}^{2} \cos 4 θ + 2 (1 - λ^{2}) \cos 2 θ - 4 (1 - λ^{2}) \sin^{2} φ \cos 2 θ - \frac{4 C (1 - λ) \sin 2 φ \cos 2 θ}{p} A_{5} = {false(1 - λ false)}^{2} ‐ \sin^{2} φ (1 + λ + 2 <...)

…”

Section: The Theory Of Plastic Zonementioning

confidence: 99%

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Research on the differentiated support technology for roadways based on the mechanical response of the plastic zone

Fan,

Wang,

Yuan

et al. 2023

Energy Science & Engineering

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With the advancement of coal resources mining to the deep part, the control of the surrounding rock of the roadway has become one of the main problems in the field of mining. At the present stage, the bolt support technology of the roadway in China still faces problems such as unclear support mechanism and poor support effect. Based on the mechanism of bolt support, through theoretical analysis and experimental research, this study proposes the differentiated support technology for roadways based on the mechanical response of the plastic zone and applies this method in the Gada Coal Mine. The results of the study showed that the plastic zones with different shapes have different mechanical responses. compared with other plastic zone shapes, the control method of the roadway with a butterfly‐shaped plastic zone is more complex. Consequently, the support design of a bolt should not only consider the scope of the plastic zone of support construction but also grasp the development law of the plastic zone. Effective support measures should be taken as early as possible for roadways with butterfly‐shaped plastic zones to prevent aggressive development of the butterfly‐shaped plastic zone. Field tests show that this support method realizes the ideal supporting effect in practical applications.

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A_{1} {(\frac{a}{r})}^{8} + A_{2} {(\frac{a}{r})}^{6} + A_{3} {(\frac{a}{r})}^{4} + A_{4} {(\frac{a}{r})}^{2} + A_{5} = 0 A_{1} = 9 {false(1 - λ false)}^{2} A_{2} = - 12 {false(1 - λ false)}^{2} + 6 {false(1 - λ false)}^{2} \cos 2 θ A_{3} = 10 {false(1 - λ false)}^{2} \cos^{2} 2 θ - 4 {false(1 - λ false)}^{2} \sin^{2} φ \cos^{2} 2 θ - 2 {false(1 - λ false)}^{2} \sin^{2} 2 θ - 4 (1 - λ^{2}) \cos 2 θ + {false(1 + λ false)}^{2} A_{4} = - 4 {false(1 - λ false)}^{2} \cos 4 θ + 2 (1 - λ^{2}) \cos 2 θ - 4 (1 - λ^{2}) \sin^{2} φ \cos 2 θ - \frac{4 C (1 - λ) \sin 2 φ \cos 2 θ}{p} A_{5} = {false(1 - λ false)}^{2} ‐ \sin^{2} φ (1 + λ + 2 <...)

…”

Section: The Theory Of Plastic Zonementioning

confidence: 99%

“…However, it will force the shallow shattered rock mass outward, causing significant deformation and instability of the road. On the other hand, it will squeeze the shallow broken rock mass outward, resulting in large deformation and collapse of the roadway 25,26 …”

Section: Introductionmentioning

confidence: 99%

Research on the differentiated support technology for roadways based on the mechanical response of the plastic zone

Fan,

Wang,

Yuan

et al. 2023

Energy Science & Engineering

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“…In the literature, the bidirectional, nonuniform stress circular roadway model is analyzed, which combines the stress expression at a point in the roadway surrounding rock using polar coordinates in elastic mechanics and the Mohr-Coulomb damage criterion to derive the implicit equation for the boundary of the plastic zone in the circular roadway in a nonuniform stress field [23]. The plastic zone boundary location in the roadway can be calculated for the given roadway specifics and surrounding rock stress conditions, as shown in Equation (2).…”

Section: Evolution Of the Shape Of The Surrounding Rock Plastic Zone ...mentioning

confidence: 99%

The Change in the Shape Characteristics of the Plastic Zone in the Surrounding Rock of an Auxiliary Retracement Channel and a Reasonable Channel Spacing Determination Method

Gao,

Liu,

Zhang

et al. 2023

Applied Sciences

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In underground coal mines, the stability of the retracement channel in the surrounding rock is crucial for the safe and efficient retracement of the equipment and to guarantee the continuity of the retracement work. To reveal the deformation and damage mechanism of the surrounding rock of an auxiliary retracement channel (ARC) and the determination method for the reasonable spacing of two retracement channels during the end of the mining period, the deviatoric stress field in front of the working face and the change in the shape characteristics of the plastic zone in the ARC are investigated in this paper. The formation of ultimate stress equilibrium, high deviatoric stress, decreasing deviatoric stress, and low deviatoric stress environments in front of the working face during the end of mining occur successively, and the different deviatoric stress environments are the main reasons for the different shape characteristics of the plastic zone in the surrounding rock. The changes in the shape characteristics of the plastic zone correspond to the changes in the shape characteristics in the zone with deviatoric stress and exhibit the following order: full plastic deformation zone, butterfly-shaped zone, elliptical zone, and circular plastic zone. A reasonable spacing determination method for the two retracement channels is proposed: the ARC is arranged in the decreasing deviatoric stress environment, where the surrounding rock plastic zone shape is elliptical, and the ARC is relatively stable. Based on this research result, the spacing of the double retracement channels at the Lijiahao 22-116 working face was determined to be 25 m, which achieved a positive application effect and allowed the safe and efficient retracement of the working face equipment.

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“…The shape and distribution characteristics of the plastic zone around a hole before failure are worth studying [14,15], and they are directly related to the disclosure of disaster mechanisms and methods of early warning [16]. In studies from recent years, the shape of the plastic zone around a hole can be roughly divided into a circle, ellipse, or butterfly (X shape) under different mechanical states obtained through theoretical calculation [17,18] and numerical simulation [19,20], and these features are called butterfly failure theory [21]. Under the action of a uniform stress field (the principal stresses in three directions are the same), the shape of the plastic zone around the hole is circular [22].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Butterfly Shape of the Plastic Zone around a Hole near Rock Failure

Zhang,

Yu,

Ren

et al. 2024

Fractal Fract

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The precursor of rock failure around a hole has always been one of the research hotspots in the field of rock mechanics, and the distribution of the plastic zone is often adopted to reflect the location and form of rock failure. The shape of the plastic zone around a hole before rock failure can guide the mechanism of and early warning methods for geotechnical engineering disasters, while previous theoretical research and numerical simulation results show that the shape of the plastic zone around the hole is butterfly shaped under specific stress, which is referred to as butterfly failure theory. Studies also indicate that the butterfly shape of the plastic zone around a hole is considered to be the main cause of many disasters, which signifies the importance of studying the morphology of the plastic zone near rock failure. Therefore, this study is committed to finding the specific shape of the plastic zone near rock failure through relatively accurate and a high number of AE event location results, and the final experimental results show that the plastic zone around the hole is basically a butterfly shape near rock failure. This study verifies the correctness of the butterfly failure theory and provides an important reference for the study of geotechnical engineering disaster mechanisms and monitoring methods. The fact that the plastic zone in the early stage of rock failure in this study tends to be butterfly shaped preliminarily indicates the fractal law of rock failure. In the moment before rock failure, the distribution of AE events is more regular, which leads to large-scale collapse type failure.

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Deformation Mechanism and Control Technology of the Surrounding Rock of the Floor Roadway under the Influence of Mining

Cited by 8 publications

References 21 publications

Research on the differentiated support technology for roadways based on the mechanical response of the plastic zone

Research on the differentiated support technology for roadways based on the mechanical response of the plastic zone

The Change in the Shape Characteristics of the Plastic Zone in the Surrounding Rock of an Auxiliary Retracement Channel and a Reasonable Channel Spacing Determination Method

Experimental Study on the Butterfly Shape of the Plastic Zone around a Hole near Rock Failure

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