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

He, Fulian; Zhai, Wenli; Xu, Xuhui; Song, Jiayu; Li, Liang; Lv, Kai

doi:10.1155/2022/1149000

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…He Fulian et al conducted a study on the mechanism of asymmetric floor bulge in roadways. They concluded that the primary factors contributing to the main roadway floor bulge are plateau rock stress, surrounding rock stress, water action, and support strength [10]. Liu Weitao et al derived the far-field stress solution and the elastic solution for stress and deformation of the roadway surroundings under the influence of mining in the bottom slab roadway based on elastic theory [11].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Mining Stress on the Sustainable Utilization of Floor Roadway in Qinan Coal Mine

Chen,

Liu,

Liu

et al. 2024

Sustainability

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Aiming at the problem of large deformations and difficult maintenance of cross-mining floor roadways, taking the track transportation roadway of the cross-mining east wing floor in Qinan Coal Mine as the engineering background, the stress field distribution of mining stress in floor strata and surrounding rock of floor roadway during the cross-mining process of the working face is studied by combining theoretical analysis with numerical simulation. The results show that the influence of mining stress on the vertical stress of floor strata is reflected in the stress-increasing area in front of the coal wall and the stress-decreasing area in the rear of the coal wall. With the increase in the depth of the floor strata, the peak value of the vertical stress gradually decreases, and the distance from the peak value of the vertical stress to the coal wall and the influence range of the vertical stress gradually increases. When the width of the coal pillar is greater than the influence range of advance abutment pressure of the working face, the development speed of the plastic zone is slow. When the roadway is located in the influence range of advance abutment pressure, the plastic zone of the roadway’s surrounding rock develops rapidly. When the working face crosses the floor roadway more than 10 m, the depth of the plastic zone of the surrounding rock of the roadway is no longer increased; the siltstone above the roadway is the key layer of fracturing, and the deformation of the roadway has been effectively improved after hydraulic fracturing. Through the analysis of numerical simulation results, the fracturing scheme has a significant effect on the stability control of the surrounding rock of the cross-mining floor roadway. This study has certain guiding significance for the maintenance and sustainable utilization of floor roadways in the cross-mining process, which is conducive to ensuring the sustainable mining of underground coal and the safety of personnel and equipment and is of great significance to the sustainable development of the coal mining industry.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of Mining Stress on the Sustainable Utilization of Floor Roadway in Qinan Coal Mine

Chen,

Liu,

Liu

et al. 2024

Sustainability

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“…Wang et al revealed that a bolt and shotcrete support could only provide limited support strength in deep softrock roadways; moreover, bolts were generally arranged in seriously broken surrounding rock, which could hardly form a stable and effective bearing structure, leading to bearing capacity failure and serious deformation [14]. He et al established a mechanical model of asymmetric floor heave for deep soft-rock roadways, and found that the stability of the roadway floor was correlated with the stress concentration coefficient of the roadway rib, the buried depth of the roadway and the cohesion and internal friction angle of the floor rock [15]. Li et al believed that the ground stress, mining stress, and rock mass structure were the main factors affecting deep roadway deformation, and summarized the mechanism of roadway deformation and damage into the oblique pressure model, the roof bending model, the floor heave model, and the sidewall bulking model [16].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Time-Dependent Instability of Deep Soft-Rock Roadway and Crack-Filling Reinforcement Technology

Chang

et al. 2023

Applied Sciences

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Soft broken surrounding rock exhibits obvious rheological properties and time-dependent weakening effects under the action of deep high-ground stress, leading to the increasingly prominent problem of sustained large deformation in deep roadways. In this study, with the II5 Rail Rise in Zhuxianzhuang Coal Mine as an example, the mechanism and control technology of time-dependent damage and instability in a deep soft-rock roadway were explored through a field observation and numerical simulation. The research results show that the range of the loose circle in the deep fractured surrounding rock can reach 3.0 m. The expansion of shallow and deep cracks causes the primary plastic deformation and secondary rheological deformation of the surrounding rock, with the rheological deformation rate increasing by 21.4% every 55 days on average, which ultimately induces the instability and failure of the surrounding rock. Based on the mechanism of roadway instability, a control technology of high-preload bolt + deep- and shallow-borehole crack filling was proposed. The technology reduces deformation and ensures the stability of the roadway surrounding rock by inhibiting the propagation of deep and shallow cracks and reinforcing the surrounding rock.

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“…The methodologies of the studies involve laboratory studies [4][5][6][7], numerical modeling [5,[8][9][10], theoretical studies [2,8,[10][11][12][13], and site investigations [14]. Shigekazu et al [4] conducted model experiments and numerical analysis to evaluate the uplift phenomena of expressway tunnels and created three load levels for the model.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Floor Heave and Failure Process of Rock Samples under Biaxial Step Loading

Li,

Peng,

Zhu

et al. 2023

Applied Sciences

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Floor heave is a typical tunnel issue in tunnelling engineering. To gain deep insights into the deformation mechanism and failure processes of floor heave at the bottom of a tunnel in layered rock, biaxial step-loading tests were conducted on rock samples (including schist and sandstone) with and without prefabricated invert arches. The failure processes of the samples were observed by the three-dimensional digital image correlation technique (3D-DIC) during the test. The test results showed that the deformation evolution processes of the floor heave of the sample included the following steps: (1) crack initiation at the interlayer weak planes; (2) separation of the rock matrix into platy structures along the bedding planes and flexures; and (3) fracture and uplift of the platy structures in the middle part. As the stress redistributes on the bottom plate of the sample, and stress concentration zones shift toward locations far away from the arching surface, the deformation evolution shows a similar variation trend with the stress. Continuous buckling fracturing takes place progressively from the vicinity of the arch surface to certain distant regions. Based on the test results, the key location of internal surrounding rock deformation was determined, and the mechanism of floor heave was clarified. The schist sample SC-BI-10 began to experience floor heave at 1064.4 s, and the deformation curve (the relationship between Y and U) showed a convex shape in the range of 0–20 mm in the Y-coordinate. The displacement reached its maximum value at y = 11.7 mm, corresponding to the position where the rock slab was broken. In addition, the influence of the interlayer properties and cover depth of rocks on bottom uplift was also studied. The design of tunnel supports and the monitoring and prevention of floor heave can benefit from this study.

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

Cited by 3 publications

References 19 publications

Study on the Influence of Mining Stress on the Sustainable Utilization of Floor Roadway in Qinan Coal Mine

Study on the Influence of Mining Stress on the Sustainable Utilization of Floor Roadway in Qinan Coal Mine

Mechanism of Time-Dependent Instability of Deep Soft-Rock Roadway and Crack-Filling Reinforcement Technology

Experimental Study on the Floor Heave and Failure Process of Rock Samples under Biaxial Step Loading

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