Mechanism and Control of Roadway Floor Heave in the Paleogene Soft Rock Surroundings

Yang, Jun; Zhou, Kuang; Cheng, Yu; Gao, Yubing; Wei, Qinglong; Hu, Yongguang

doi:10.1007/s10706-019-00970-6

Cited by 16 publications

(20 citation statements)

References 6 publications

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“…The strain softening phenomenon will occur during the compression process of the coal mass . That is, after the coal mass reached the peak strength, the strength will rapidly decrease to a relatively low level with the increase of the deformation .…”

Section: The Surrounding Rock Failure Characteristics During the Excamentioning

confidence: 99%

“…The strain softening phenomenon will occur during the compression process of the coal mass. 22 That is, after the coal mass reached the peak strength, the strength will rapidly decrease to a relatively low level with the increase of the deformation. 23,24 Based on compaction experiment, scholars generally hold that the strain softening model of the coal mass could be divided into the elastic stage, softening stage, and residual stress stage, as shown in Figure 5A.…”

Section: Strain Softening Model Of the Coal Massmentioning

confidence: 99%

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Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Tai

Xia

Kuang

2019

Energy Science & Engineering

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The coal production exploited from extra‐thick coal seams accounts for 45% of China's total coal production. With large coal output, the extra‐thick coal seams require that the chamber section be more than 100 m2. In case of parting (the noncoal rock, usually mudstone, sandwiched in the coal seam) in the extra‐thick coal seams, the integrity of the coal seams will be damaged and the large‐section chamber is extremely easy to occur rib spalling and roof leakage, which will increase the chamber's supporting difficulty. To solve such problems, this paper took the electromechanical chamber in Tashan Coal Mine as the engineering background and analyzed the deformation and failure characteristics of this chamber surrounding rocks by the numerical simulation method during the excavation process. The results indicated that the failure areas of surrounding rocks were mainly in partings, chamber ribs, and chamber dome with the failure depths of 15 m, 10 m, and 5 m, respectively. Based on the obtained deformation and failure characteristics, the supporting method of grouting integrated with high‐strength bolts and anchor cables was put forward. The grouting method was firstly used to improve the integrity of the chamber surrounding rocks, and the high‐strength bolts and anchor cables were used for supporting. Then, the supporting parameters of the bolts and anchor cables and the grouting parameters were optimized by the numerical simulation method. The optimized parameters were applied in the electromechanical chamber in Tashan Coal Mine, and the on‐site chamber ribs lateral displacement and roof separation amounts were only 0.018 m and 0.012 m, respectively, indicating that the surrounding rocks were controlled effectively.

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Section: The Surrounding Rock Failure Characteristics During the Excamentioning

confidence: 99%

Section: Strain Softening Model Of the Coal Massmentioning

confidence: 99%

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Tai

Xia

Kuang

2019

Energy Science & Engineering

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“…Many studies have been carried out by many scholars on the floor heave control of roadways with similar conditions [4,16,[28][29][30][31]. For example, Gu et al [28] proposed the combined support of bolt grouting and grooving to control floor heave for the floor of return airway in 2407 working face of high-stress roadway with soft rock in Yuhua Coal Mine, Tongchuan, and the field monitoring showed that the floor heave displacement was reduced by 61.5%.…”

Section: Discussionmentioning

confidence: 99%

“Relief‐Retaining” Control Technology of Floor Heave in Mining Roadway with Soft Rock: A Case Study

Liu

et al. 2021

Advances in Civil Engineering

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The floor heave problem is one of the important factors affecting the stability and safety of surrounding rocks of roadways, especially in deep high-stress mining roadway with soft rock. The return airway of no. 130203 working face in Zaoquan Coal Mine of Ningdong Mining Area in Northwest China is the research object in this study. Firstly, an innovative “relief-retaining” control scheme of floor heave is proposed, which is the comprehensive measure of “cutting groove in floor + drilling for pressure relief at roadway side + setting retaining piles at the junction of roadway side and floor.” Then, the specific parameters suitable for floor heave control of no. 130203 return airway are determined using numerical simulation method. Finally, the yield monitoring results show that both the deformation of surrounding rocks and the cable force are significantly reduced. The roof falling capacity, floor heave displacement, and thickness increasing value of 0–2 m floor strata are 596 mm, 410 mm, and 82 mm, respectively, which are 43.67%, 67.49%, and 75.38% less than those of the control section. The maximum force of cables at roadway sides is 140.13 kN, about 32.54% less than that of the control section. The results verify the reliability of the proposed “relief-retaining” control scheme and can provide some reference for the floor heave control of similar roadways.

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“…Guo et al [19] used theoretical analysis and numerical analysis methods to analyze the failure characteristics of floor surrounding rock and put forward the flexural instability criterion of floor. With respect to floor heave control, Kang [20] believed that floor heave was caused by the following three aspects: the buckling of unstable floor strata into the roadway, the expansion under the action of eccentric stress, and the water-induced rock swelling. Yang et al [21] studied the mechanism of floor heave in soft rock roadway and proposed a new coupling support technology of a bolt-mesh-anchor-base angle bolt-flexible layer truss for controlling the floor heave of roadway.…”

Section: Introductionmentioning

confidence: 99%

Study on Mechanism and Control Technology of Asymmetric Floor Heave in a Deep Soft Rock Main Roadway

Zhai

et al. 2022

Geofluids

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Considering the serious asymmetric deformation and failure of the floor of 1# main roadway in Wanglou Coal Mine, the mechanism of roadway asymmetric floor heave was studied through on-site investigation, theoretical analysis, numerical simulation, and on-site test. The following conclusions were drawn: (1) the floor heave of 1# main roadway is mainly caused by high original rock stress, surrounding rock stress, water physical effect, support strength, etc. (2) A mechanical model of asymmetric floor heave is built and analyzed. Roadway floor stability is relevant to the stress concentration coefficient of the roadway sides, the burial depth of the roadway, and the cohesion and internal angle of friction of the floor rock. The relationship between the upward resultant force of the floor and the stress concentration coefficient of the roadway sides is established. Affected by mining, the upward force of roadway floor reaches 17.0 MPa, and serious floor heave is easy to occur when the floor is opened. (3) The floor heave curve of the position of 1# main roadway corresponding to working face is obviously asymmetric, the maximum value of floor heave being 948 mm. The floor heave curve of other positions of 1# main roadway is basically symmetric, the maximum floor heave value being merely 497 mm. A new “differentiated” combined support is proposed and field tested. It has been 13 months since the completion of main roadway repair in this section, no obvious deformation occurred, and the long-term stability of soft rock roadway support in deep mines is realized.

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Mechanism and Control of Roadway Floor Heave in the Paleogene Soft Rock Surroundings

Cited by 16 publications

References 6 publications

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

“Relief‐Retaining” Control Technology of Floor Heave in Mining Roadway with Soft Rock: A Case Study

Study on Mechanism and Control Technology of Asymmetric Floor Heave in a Deep Soft Rock Main Roadway

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