Strain energy analysis of floor heave in longwall gateroads

Wang, Meng; Zheng, Dongjie; Wang, Kewei; Li, Wenfeng

doi:10.1098/rsos.180691

Cited by 15 publications

(8 citation statements)

References 29 publications

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“…Nowadays, the study of energy evolution in rock mechanics has been refined to different depth of cover, loading conditions and in situ stress magnitudes [24][25][26][27][28]. Energy changes determined in UDEC are royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Energy Balance and Componentsmentioning

confidence: 99%

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An investigation on the effect of high energy storage anchor on surrounding rock conditions

Wang

Bai

et al. 2020

R. Soc. open sci.

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High pre-tension bolt is an effective strata control technique and is the key to ensure the stability of anchorage and roadway. Based on the performances of high energy storage tension rock bolts in different rock properties, this study proposed a constitutive model to describe the energy balance of anchor under uniaxial compression. UDEC was used to simulate the behaviour of anchor in coal under uniaxial compression and the results were analysed to study the rock mechanical properties, degree of damage and energy evolution. Simulation results showed that tension rock bolts can improve the mechanical properties and energy storage capacities of the anchor. The energy evolution was divided into three stages: (i) the external work was stored in the form of elastic strain energy ( U e ) in the anchor prior to the yielding strength; (ii) the elastic strain energy reached its maximum near the peak strength; (iii) energy was dissipated from fracture friction ( W f) , plastic deformation ( W p ) and acoustic emission ( U r ) during post-peak stage. The installation of tension rock bolts was more suitable for medium hard rock (e.g. sandy mudstone), whereas it was not effective for hard rock (e.g. sandstone).

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Section: Energy Balance and Componentsmentioning

confidence: 99%

“…Nowadays, the study of energy evolution in rock mechanics has been refined to different depth of cover, loading conditions and in situ stress magnitudes [ 24 – 28 ]. Energy changes determined in UDEC are performed for the intact rock, the joints and for the work done on boundaries.…”

Section: Energy Balance and Componentsmentioning

confidence: 99%

An investigation on the effect of high energy storage anchor on surrounding rock conditions

Wang

Bai

et al. 2020

R. Soc. open sci.

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“…Mo et al [16] introduced a new floor classification system, the coal mine floor rating, based on the underlying failure mechanisms. M. Wang et al [17]. Based on a case study of a longwall entry employing a stiff-yield pillar configuration, massive floor heave occurs at the entry rib that takes less loads and eventually propagates towards the other rib bearing a significant amount of loads.…”

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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“…For a fully mechanized caving face, the different thicknesses of the caving coal correspond to different main roof strata activity states. The non-uniform characteristics of the stress around the rock surrounding the roadway are inconsistent, and the distribution law of the floor heave deformation is more complex [3][4][5][6][7]. To clarify the mechanism caving coal mining, and the mining roadways on both sides are arranged along the coal floor.…”

Section: Introductionmentioning

confidence: 99%

Control Technology of Soft Rock Floor in Mining Roadway with Coal Pillar Protection: A case study

Jia

Wang

Fan³

et al. 2019

Energies

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This study considered the mining roadway with coal pillar protection in the fully mechanized caving face of the Dananhu No.1 Coal Mine, China. Theoretical analysis, numerical simulation, and field tests were conducted, and the stress environment, deformation, and failure characteristics of the mining roadway in the fully mechanized caving face were analyzed. The results revealed that the intrinsic cause for the large asymmetrical floor deformation in the mining roadway is the asymmetrical phenomenon of the surrounding rock's stress environment, caused by mining. This also results in the non-uniform distribution of the mining roadway floor's plastic zone. The degree of asymmetrical floor heave is internally related to the thickness of the caving coal. When the thickness of the caving coal was in the range of 5.9 m, the deformation of the asymmetrical floor heave, caused by the plastic failure in the floor, became more obvious as certain parameters increased. As the rotation angle of the principal stress direction increased, the maximum plastic failure depth position of the floor gradually moved toward the middle of the roadway. This caused a different distribution for the maximum deformation position. The control of the floor heave deformation was poor, and it was not feasible to use high-strength support under the existing engineering conditions. Hence, the control should mainly be applied to the floor heave deformation. When the thickness of the caving coal was more than 5.9 m, the main roof strata was prone to instability and being cut along the edge of the coal pillar; the rock stress environment surrounding the roadway tended to revert back to the initial geostress state. The proposed floor heave control strategy achieved good results, and as the deformation of the floor heave decreased, the workload of the floor heave was also greatly reduced.Energies 2019, 12, 3009 2 of 21 and law governing the asymmetric floor heave of the mining roadway in a fully mechanized caving face, we propose a targeted response plan to ensure the normal operation and safety of the roadway.The floor heave control of mining roadways has always been an important issue in the field of mine pressure and rock mechanics. In recent years, many studies have been conducted to clarify the deformation mechanism of the roadway floor heave, and countermeasures have been proposed to control it. To date, different types of roadway floor heave management methods have been proposed. Hou et al. [8][9][10] reported that the main factor influencing the floor heave of the mining roadway is the front abutment pressure of the coal face. The floor heave of the mining roadway is mainly caused by the post-peak deformation of the floor's broken strata. The deformation of the roof and two sides of the roadway also exert a significant influence on the floor heave. Reinforcing the two sides of the roadway and the corners can achieve better control over the floor heave of the mining roadway. He et al. [11][12][13] proposed a new method to effectively control the ...

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Strain energy analysis of floor heave in longwall gateroads

Cited by 15 publications

References 29 publications

An investigation on the effect of high energy storage anchor on surrounding rock conditions

An investigation on the effect of high energy storage anchor on surrounding rock conditions

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

Control Technology of Soft Rock Floor in Mining Roadway with Coal Pillar Protection: A case study

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