Study on Deformation Failure Mechanism and Control Technology of Surrounding Rock in Soft Rock Roadway

Wang, Xiangqian; Li, Yingming; Zhao, Chengxing; Wang, Yi; Huang, Shunjie

doi:10.1007/s10706-021-01977-8

Cited by 7 publications

(6 citation statements)

References 15 publications

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“…In view of the roadway under this condition, the prop support scheme adopted is as follows: a row of singleprops is set every 1 m, three single-props were set in each row, and a top beam shall be added above the props. However, the determination of cable pre-tightening force parameters is relatively complex, and numerical simulation can better simulate and monitor the stress, deformation, and other characteristics of the roadway under diferent pre-tightening forces [15]. Terefore, this paper adopts a numerical simulation scheme to optimize the pre-tightening force.…”

Section: Support Optimization Simulation Studymentioning

confidence: 99%

Deformation and Failure Evolution Law and Support Optimization of Gob-Side Entry in Weakly Cemented Soft Rock under the Influence of Fault

Ma,

Yu,

Zhou

et al. 2024

Shock and Vibration

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Under the condition of weakly cemented soft rock in Western China, the surrounding rock deformation of gob-side entry is obvious, especially under the influence of fault, and the problem of surrounding rock control becomes increasingly prominent. To solve this issue, this paper firstly studied and obtained the evolution law of the ground pressure appearance of the gob-side entry in the fault area, then put forward the concept of surrounding rock control in the fault area of the gob-side entry, put forward a targeted pressure relief + increase preload + passive reinforcement parallel to the roadway surrounding rock strengthening control scheme, and carried out field applications. The results show that the roof subsidence and mining side heave of the roadway in the fault area increase significantly, accompanied by the characteristics of broken cables, the length of the broken cable is 0.2 m–0.6 m, and the breaking process is divided into multiple breaks. The stress evolution of gob-side entry in fault area presents a stage characteristic of “rapid growth-stable.” The surrounding rock control effect is improved under the bolt cable high pre-tightening support, and the roadway deformation is effectively controlled under the pressure relief + active + passive support, with a good application effect.

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Section: Support Optimization Simulation Studymentioning

confidence: 99%

Deformation and Failure Evolution Law and Support Optimization of Gob-Side Entry in Weakly Cemented Soft Rock under the Influence of Fault

Ma,

Yu,

Zhou

et al. 2024

Shock and Vibration

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“…After mining in the 360808 working face, the roof collapsed and broke on the side of the coal pillar in the lower section. A typical mechanical model was analyzed to determine the three different fracture positions after the main roof of the end zone broke [42,43], as shown in Figure 10. According to the theory of masonry beams, the main roof is at the breaking step distance.…”

Section: Deformation and Failure Characteristics Of Surrounding Rock ...mentioning

confidence: 99%

“…After mining in the 360808 working face, the roof collapsed and broke on the side of the coal pillar in the lower section. A typical mechanical model was analyzed to determine the three different fracture positions after the main roof of the end zone broke [42,43], as shown in Figure 10. From the fracture state of the 360808 working face, it can be seen that the studied fracture morphology is more in line with the second type; that is, the main roof fracture is above the retracement channel, as shown in Figure 10b.…”

Section: State Of the Overburden Structure Of The Retracement Channelmentioning

confidence: 99%

Study on the Stress Evolution and Strengthening Support Timing of the Retracement Channel under the Super-Thick Nappe

Zhu,

Yue,

Gao

et al. 2023

Sustainability

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The superposition effect of the advanced support pressure of the working face in the final mining stage and the lateral support stress of the roadway is a key factor affecting the stability of the retracement channel. To study the stress evolution of the retracement channel under the super-thick nappe and the timing of strengthening support, this paper takes the mining of the 360808 working face in Xinji No. 1 Mine as the engineering background, analyzes the occurrence conditions of the working face and the measured rock pressure law, and constructs a roof structure model of the retreat area. The UDEC discrete element numerical simulation software was used to analyze the evolution characteristics of concentrated stress and the failure law of surrounding rock around the retracement channel under gradual excavation conditions. Based on the relationship between the position of the main roof fracture and the stability of the surrounding rock of the retracement channel, the instability mechanism of the surrounding rock of the retracement channel was revealed. A mechanical model of the surrounding rock of the retracement channel under the condition of a gradient coal pillar was established, and the energy criterion K for the instability of the surrounding rock was obtained. The method of adding anchor cables to strengthen the support of the surrounding rock of the retracement channel was proposed. The results indicate that the accumulation of energy in the surrounding rock of the retracement channel is greater than the internal consumption of energy, which is the direct reason for the instability of the surrounding rock of the retracement channel. The time to strengthen the support of the roof is when the working face is 15 m away from the retracement channel. According to the analysis of on-site monitoring results, the roof convergence and the two-sides convergence before and after strengthening the support were reduced by 90 mm and 140 mm, respectively. Under the strengthening of support, the slope of the retracement channel in the 360808 working face is slight, without roof fall, and the surrounding rock of the channel is effectively controlled, which is of great significance for ensuring the safe application of the retracement channel. It has reference value for the safety production of surrounding mines and is conducive to promoting the sustainable development of local resource-based society and economy.

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“…The FLAC 3D software was used to establish the computational model, and the effect of moisture content on the unstable deformation of the roadway was analyzed by using the coupling of large deformation and hydrostatic modules. It should be noted that pores and joint fissures of various morphologies in the natural coal rock structure were not considered (Wang et al, 2021). The model was assumed to be isotropic and the Moore Coulomb criterion was used in the simulation (Jia et al, 2021).…”

Section: Failure and Evolution Law Of Roadway Surrounding Rock Under ...mentioning

confidence: 99%

Instability and failure characteristics of surrounding rock of water drenching roadway in thick coal seam

Jia

Fan

et al. 2022

Front. Earth Sci.

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Aiming at the water drenching problem in the roof of transport roadway 2,606 of the Zhangcun coal mine, the instability and failure law of the drenching roadway was studied by borehole peephole, soaking water softening test and numerical simulation in this study. It is found that the relation between compressive strength, elastic modulus, tensile strength and moisture content is a negative exponential function. Subsequently, the Fish language was used to embed the functional relationship between mechanical parameters of surrounding rock in the roadway and moisture content into Flac3D software to simulate the failure law of surrounding rock under different moisture contents. The influence of moisture content on the surrounding rock is ordered as roof > two sides > floor. Through the comparison between borehole peeping and plastic zone, the roof water content is obtained by inversion. The results provide a reference basis for the selection of the surrounding rock support method for drenching roadway in thick coal seam.

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Study on Deformation Failure Mechanism and Control Technology of Surrounding Rock in Soft Rock Roadway

Cited by 7 publications

References 15 publications

Deformation and Failure Evolution Law and Support Optimization of Gob-Side Entry in Weakly Cemented Soft Rock under the Influence of Fault

Deformation and Failure Evolution Law and Support Optimization of Gob-Side Entry in Weakly Cemented Soft Rock under the Influence of Fault

Study on the Stress Evolution and Strengthening Support Timing of the Retracement Channel under the Super-Thick Nappe

Instability and failure characteristics of surrounding rock of water drenching roadway in thick coal seam

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