Experimental Study of Shear Strength Features of Regenerated Rock Mass compacted and consolidated by Broken Soft Rocks

Ma, Wenqiang; Wang, Tongxu

doi:10.1007/s12205-019-1831-2

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…They revealed the effects of normal stress and joint orientation and assessed the anisotropy and directionality of shear strength. Ma et al 24 revealed the effect of rock particle gradation and compression ratio on the shear strength properties of regenerated rock structure (RRMS) formed by confined compression of fractured soft rock. They revealed the effect of particle gradation on compaction and surface smoothness.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on fracture characteristics of rock-like material with prefabricated cracks under compression shear

Yuan

Jiang

Lei

et al. 2022

Sci Rep

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In order to understand the effects of different patterns of prefabricated fractures and grain size compositions on the fracture characteristics, acoustic emission characteristics and mechanical properties of the rock masses. We conducted compression shear experiments on square rock masses with different modes of prefabricated fractures and different grain size compositions. The experimental results showed that five fracture patterns were produced in specimens with different fracture patterns. The first fracture specimen, the fourth fracture specimen and the fifth fracture specimen were all brittle fractures. The other four specimens were not brittle fractures. The fracture patterns, fracture processes and mechanical characteristics of the different fracture pattern rock masses were revealed. The lowest peak shear stresses were found in specimens consisting of two grain size ranges and the highest peak shear stresses were found in specimens consisting of three grain size ranges. The highest shear displacements corresponding to the peak shear stresses were found in the specimens consisting of three particle size ranges. The effect of different grain size compositions on the peak shear stress and its corresponding shear displacement of the rock mass was revealed. Specimens consisting of one grain size range produced significant fracture and acoustic emission prior to the peak shear stress. The acoustic emission was jumped after the main fracture was formed. The specimen consisting of two grain size ranges produced fractures and strong acoustic emission characteristics after the peak shear stress. Thereafter, fracture reappeared and the acoustic emission signature increased again. As the specimen entered the residual strength phase, the acoustic emission was jumpy. Specimens consisting of three grain size ranges were brittle fractures with weak acoustic emission characteristics after the main fracture has formed. The cumulative energy of shear acoustic emission was the highest for a rock mass consisting of three grain size ranges. The rock mass consisting of three grain size ranges was also the strongest and most difficult to fracture because the grains were more fully embedded in each other.

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Section: Introductionmentioning

confidence: 99%

Experimental study on fracture characteristics of rock-like material with prefabricated cracks under compression shear

Yuan

Jiang

Lei

et al. 2022

Sci Rep

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“…e vertical height of the caved zone with a highly irregular shape and different granular caved gangue can reach 4-11 times the mining height [10,11]. e caved gangue is gradually compressed by the overburden load resulting from mining disturbance, which supports the deformable upper rock strata [12,13]. erefore, the variable load compaction of caved gangue in gob directly determines the movement of the upper strata.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Bearing Deformation Characteristics of Caved Gangue in Gob under Different Moisture Conditions

Wang

Wei

Zhang

et al. 2022

Mathematical Problems in Engineering

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In gob, the caved gangue is in a state of long-term bearing deformation with obvious time-dependent effect, even though the coal seam has been mined for a long time. As time goes on, because of the excessive deformation of caved gangue, the gob surrounding rock will easily aggravate the structural instability and cause dynamic disasters, such as mine water inrush and surface collapse. If the gob is filled with water, the bearing capacity of the caved gangue in waterlogged environment will be worse than that in dry environment, which will greatly increase the possibility of disasters. In order to study the bearing deformation characteristics of caved gangue under different moisture conditions, a testing system used for bearing deformation testing of caved gangue is developed. The typical caved gangue is chosen for samples. In view of the particle size distribution characteristics and stress state of caved gangue, the size distribution of caved gangue obeys the law of normal distribution and the load pattern is designed to step load. With the increase of axial load, the axial deformation of caved gangue increases gradually, the residual bulking coefficient decreases gradually, which are more obvious in load stage than in constant load stage. In the early constant load stage, the axial deformation of caved gangue grows rapidly, then tends to be slow and steady gradually; the relationship between strain and time meets the logarithmic relationship. In load stage, the D-value of axial strain decreases gradually along with the increase of axial load, whereas in constant load stage, it is opposite; the bearing deformation of caved gangue is consisted of two parts: instantaneous compression deformation and long-term deformation. For instantaneous compression deformation, the water acting as the lubricant promotes the compressive strain of caved gangue specimen and is conducive to rotation and slipping between each rock block. For long-term deformation, meanwhile, the water acting as the softening agent reduces the strength of the rock block and is conducive to the crushing of the rock block. The newborn rock blocks may slip and fill the gap between rock blocks, which also promotes the compressive strain of caved gangue specimen. The research results have important significance for forecasting and controlling the movement and deformation of overlying strata caused by mining.

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Self-bearing Characteristics and Control Strategy of a Cataclastic Regenerated Rock Mass in a Roadway Roof with Top Remains: A Case Study

Wang

2020

Geotech Geol Eng

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Experimental Study of Shear Strength Features of Regenerated Rock Mass compacted and consolidated by Broken Soft Rocks

Cited by 6 publications

References 21 publications

Experimental study on fracture characteristics of rock-like material with prefabricated cracks under compression shear

Experimental study on fracture characteristics of rock-like material with prefabricated cracks under compression shear

Long-Term Bearing Deformation Characteristics of Caved Gangue in Gob under Different Moisture Conditions

Self-bearing Characteristics and Control Strategy of a Cataclastic Regenerated Rock Mass in a Roadway Roof with Top Remains: A Case Study

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