Influence of Mechanical Properties of Filling Paste on Overlying Strata Movement and Surface Settlement

Liu, Yufei; Wu, Xin-Hua; Zhu, Tao; Wang, Xianjun; Zhang, Guoyu; Wang, Zhigang

doi:10.1155/2022/4687200

Cited by 5 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since there are many studies on the proportion of backfill materials (Koohestani et al, 2016;Jiang et al, 2020;Liu et al, 2022), the composition was adjusted according to the one in the neighboring Tianyu coal mine, and the laboratory and downhole proportioning experiments were conducted. As shown in Tables 3, 4, the final results obtained via the uniaxial compression test show that when the cement dosage is certain, excess gangue leads to lower strength of the backfill body, so the proportion of gangue should be in a reasonable range.…”

Section: Design Of the Proportion Of Backfill Materialsmentioning

confidence: 99%

Short-wall paste continuous mining and continuous backfilling for controlling industrial square surface subsidence

Meng

Dong²,

Zhang³

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

To facilitate coal mining under the industrial square in Western China, short-wall paste continuous mining and continuous backfilling (PCMCB) is proposed to release the overlaid resources and handle coal gangue. First, the concept of short-wall PCMCB is presented, and the principle of surface subsidence is analyzed. Second, the mechanical model of the branch roadway and strength of the backfill body are established via mechanical derivations. Third, the proportion of backfill materials is calculated. Finally, field applications are carried out in the Dingjiaqu coal mine. The results show the following: 1) Based on the simply supported beam model of the roof and strength design model of the backfill body, the reasonable width of the branch roadway was determined as 5 m and late strength of the backfill body should exceed 2.62 MPa in the Dingjiaqu coal mine. 2) According to the design strength of the backfill body and backfill material proportion, the reasonable ratio of cement: fly ash: gangue: water was determined as 1:1.82:4.17:1.78. 3) In accordance with the equivalent mining height theory, the critical filling rate of the goaf should be more than 90% to ensure that the deformation is within the first level of building damage. 4) The field application shows that subsidence could be effectively controlled by backfilling, the overall surface subsidence was very small, and the maximum subsidence value (77 mm) was far lower than the deformation extremes of the building protection requirements. This study provides practical guidance for the exploitation of overlaid resources under similar shallow burial conditions, which can help in the disposal of coal gangue with considerable social and economic benefits with popularization and application.

show abstract

Section: Design Of the Proportion Of Backfill Materialsmentioning

confidence: 99%

Short-wall paste continuous mining and continuous backfilling for controlling industrial square surface subsidence

Meng

Dong²,

Zhang³

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…However, the filling body has a supporting effect on the unstable ore column and surrounding rock; to a certain extent, the movement deformation of the rock mass are controlled. However, the surface subsidence at this stage is not much different from before treatment; on the one hand, it is determined by the mechanical characteristics of the filling body; the stronger the compression resistance of the filling body, the stronger the support force for the ore column, and the slower the movement deformation speed of the rock mass; On the other hand, the filling rate determines it, the higher the filling rate, the smaller the empty ceiling, and the smaller the surface subsidence after filling [32][33][34][35]. Therefore, it can be seen from Error!…”

Section: Surface Subsidence Law During the Filling Of The Mining Areamentioning

confidence: 99%

“…(a), it can be concluded that the No. 3 Goaf in the first y ear after full filling treatment with the compression of the filling body, the height of the empty roof gradually decreases; at this time, the load of the overlying rock layer is mainly borne by the filling body, roof plate and ore column, which restricts the movement of the rock mass to a certain extent [33,35], so the settlement area is significantly reduced. The surface subsidence slows down significantly, but the settlement amount at the large mining depth is still greater than the shallow part, so the settlement at the maximum mining depth in the figure is 38.3mm, greater than the settlement in other areas.…”

Section: Surface Subsidence Law In the First Year After The Treatment...mentioning

confidence: 99%

Study on Rock Strata Movement Deformation and Surface Subsidence in Mining Area Based on PS-InSAR Technology

Huang¹,

Li²,

Li³

et al. 2023

Preprint

View full text Add to dashboard Cite

The rock strata movement deformation generated by the mining process of the mine will inevitably lead to surface subsidence and a series of environmental hazards, so it is particularly important to monitor the rock strata movement deformation and surface subsidence in the goaf area. With the development of surface subsidence monitoring technology, InSAR technology has been widely used in the research of surface subsidence in mining areas with the advantages of high precision and wide monitoring. In this paper, by obtaining the image data of 59 Sentinel-1A scenes in the mining area, the obtained PS points were analyzed and processed by ArcGIS difference analysis by PS-InSAR technology, and the surface deformation cloud map and settlement curve of the mining area in various periods were obtained, and the rock strata movement deformation and surface subsidence law of the goaf before treatment and after different treatment methods were studied by influencing factors such as stope layout and mining depth. The results show that the rock strata movement deformation and surface subsidence degree of the goaf under different treatment methods are different due to different influencing factors, and their positions also change dynamically with time. Applying InSAR technology to study rock strata movement deformation and surface subsidence can provide an important basis for mine safety mining, goaf treatment, rock strata movement deformation and surface subsidence monitoring.

show abstract

“…High-water quick-setting materials, such as abandoned roadway filling materials, as a whole, have poor cementing performance and bonding roller, are not easy to wash, and are expensive. With Remy filling materials, due to their brittleness, cutting can easily cause strong vibrations in the coal mining machine, which is not conducive to the safety and stability of the working face [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Research on Mechanical Properties and Engineering Applications of Inorganic Cementitious Filling Materials in Coal Mine Abandoned Roadways

Sun,

Li,

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

To solve the problems of brittleness, high cost, and the complicated construction process of traditional filling materials for filling abandoned roadways, various aspects of the physical and mechanical properties of the materials were studied using laboratory tests and were applied in coal mines. The research shows that the self-developed inorganic cementitious filling material has the advantages of being low cost, easy to cut and wash, and having good filling performance. A foaming agent is a direct factor in controlling the volume expansion of inorganic cementitious filling materials; the increase in the volume of slurry foaming with the addition of a foaming agent initially showed a large and then a small trend with a foaming agent dosage of 100 g. The increase in the volume of slurry foaming is the largest at 56.28%. The effect of the B material (calcium stearate+ J85 rapid-setting agent) on the foaming time and the number of foaming times of the slurry was significant. Foam stabilizers in the B material make the slurry particles uniformly distributed inside the slurry, while quick-setting agents control the initial and final setting time by affecting the slurry setting speed. The water/cement ratio directly affects the foaming times of the slurry but has little effect on the foaming time and setting speed. When the water/cement ratio is less than 1:2, the slurry foaming effect is poor, and the foaming volume remains unchanged. The strength of the material is significantly affected by the proportion of B material and the amount of blowing agent, and the compressive strength of materials with different compositions and ratios varies greatly. A whole set of systems of new inorganic gelatinized abandoned roadway filling materials was researched and applied in coal mines, achieving good results.

show abstract

Influence of Mechanical Properties of Filling Paste on Overlying Strata Movement and Surface Settlement

Cited by 5 publications

References 24 publications

Short-wall paste continuous mining and continuous backfilling for controlling industrial square surface subsidence

Short-wall paste continuous mining and continuous backfilling for controlling industrial square surface subsidence

Study on Rock Strata Movement Deformation and Surface Subsidence in Mining Area Based on PS-InSAR Technology

Research on Mechanical Properties and Engineering Applications of Inorganic Cementitious Filling Materials in Coal Mine Abandoned Roadways

Contact Info

Product

Resources

About