Experimental research on coal seam similar material proportion and its application

Cheng, Weimin; Sun, Lulu; Wang, Gang; Du, Wenzhou; Qu, Hongyuan

doi:10.1016/j.ijmst.2016.05.034

Cited by 26 publications

(16 citation statements)

References 3 publications

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“…The Ju Ye Coalfield, in southwestern Shandong Province, China (Lai et al 2016;Cheng et al 2016a;;Zhang et al 2017;Wang et al 2017b), is located in a thick loose layer of the Quaternary sediment. The average coal seam thickness is 6 m, and the burial depth is about 850 m (Zhang et al 2014;Di et al 2015;Cheng et al 2016;Deng et al 2016;Wang et al 2016). There are numerous problems associated with deep mining of thick loose layers and thick coal seams.…”

Section: Introductionmentioning

confidence: 99%

Study on overburden failure characteristics in deep thick loose seam and thick coal seam mining

Liu

Pang

et al. 2020

Geomatics, Natural Hazards and Risk

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In order to solve the related problems of roof collapse in deep thick loose seam, taking the actual geological conditions of 1302 working face of Zhaolou Coal Mine as the geological background. A mechanical calculation and analysis model for a deep thick loose seam is established. A mining dynamic simulation was carried out using the numerical simulation software FLAC3D. Fracture development height was observed using a multi-stage plugging and leak detection system. Sublevel solid compaction filling technology was used to fill the goaf. Research shows that the caving zone, fissure development zone, and bending subsidence zone are formed during thick loose seam mining. The caving zone area is larger when the ground stress on the roof is larger, and fracture zones are better developed because the density of the loose seam area is smaller. Numerical simulation results are slightly larger than the measured results, so the roof overburden activity can be effectively predicted using the numerical simulation. The problem of serious roof collapse and surface subsidence in goafs can be effectively controlled using sectional compact filling technology.

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Section: Introductionmentioning

confidence: 99%

Study on overburden failure characteristics in deep thick loose seam and thick coal seam mining

Liu

Pang

et al. 2020

Geomatics, Natural Hazards and Risk

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“…Model Test System. In accordance with previous studies [16][17][18], in this work, the formation in the test interval was generalized to be a homogeneous and continuous Class VI weak surrounding rock, so as to carry out follow-up studies. Combined with the test conditions, the model test geometric similarity ratio C L was determined to be 1/30.…”

Section: Model Testmentioning

confidence: 74%

Instability Mechanism of Cavity‐Bearing Formation under Tunnel Excavation Disturbance

Liu

Wang

et al. 2020

Advances in Civil Engineering

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Urban subway construction inevitably causes disturbances to the rock strata. It can even cause ground collapse accidents when construction encounters a bad geological body in the stratum. To verify the influence of cavities on surface settlement and the mechanism of formation instability, the instability mechanism of cavity-bearing strata under tunnel excavation disturbance was herein studied by tests using self-designed indoor models and numerical simulations. This study was based on the concrete project case of Qingdao Metro. Two groups of experiments (with and without cavities) were designed to simulate the four-step excavation by staged unloading of an airbag. The results show that the settlement value in the cavity state was about twice as much as that in the nonvoid state at the same stage. Besides the first step of excavation, in the numerical simulation, the settlement value of the same stage is about 1.3 times that of the model test. Simulating the deformation process of the surrounding rock in model tests shows that, in the excavation of the tunnel, the collapse surface of the tunnel arch roof will be connected with the sliding surface of the formation cavity. The cavity will gradually change from a regular circle to an ellipse or may even close, resulting in a sudden increase in land subsidence or even ground collapse. This indicates that disturbance during tunnel excavation would cause greater instability in a stratum when bad geological bodies, such as cavities, exist in the stratum.

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“…en, a large number of scholars have carried out many large-scale model tests using various similar materials and applied them to different geotechnical engineering. Cheng et al analyzed the optimization design of low-strength mechanical test and orthogonal test to simulate the mechanical properties of thick coal seam and extra thick coal seam and obtained the influence degree of each component on uniaxial compressive strength [15]. Zhang et al developed a similar material called iron crystal sand that is mixed with iron ore powder, barite powder, quartz sand, gypsum powder, and rosin-alcohol solution, applied it to the threedimensional geomechanical model test study of large bifurcation tunnel, and successfully revealed the deformation performance of surrounding rock of bifurcation tunnel [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Research and Sensitivity Analysis of Mudstone Similar Materials Based on Orthogonal Design

Wen

Jia

et al. 2020

Advances in Materials Science and Engineering

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Due to the strong hydration sensitivity of mudstone, drilling of deep mudstone is difficult and pricy, which results in the study on its physical and mechanical properties inseparable from similar material tests. On these bases, triaxial compression and Brazilian tensile tests of the original mudstone drilled from the caprock of the D5 aquifer structure are carried out. Then, orthogonal experiments of mudstone similar materials with river sand and barite powder as aggregate and cement and gypsum as the binder are conducted, which include 3 factors that, respectively, are mass ratio of aggregate to binder, mass ratio of cement to gypsum, and barite powder content, and each factor contains 5 levels, totalling 25 groups of 150 samples. By comparing the results of mudstone and artificial samples made of similar materials, it is obvious that artificial samples and mudstone are significantly similar in terms of density, compressive strength, elastic modulus, and compressive strength when the aggregate-binder ratio is about 4, 8, 5, and 4, respectively. Further sensitivity analysis showed that the aggregate-binder ratio played a major role in controlling the properties of artificial samples, while the sensitivity of different parameters to the cement-gypsum ratio and barite content was different. The results indicate that the selected raw materials and their proportion are feasible, which can meet similar requirements and can be a reference for similar material experimental research of target mudstone.

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Experimental research on coal seam similar material proportion and its application

Cited by 26 publications

References 3 publications

Study on overburden failure characteristics in deep thick loose seam and thick coal seam mining

Study on overburden failure characteristics in deep thick loose seam and thick coal seam mining

Instability Mechanism of Cavity‐Bearing Formation under Tunnel Excavation Disturbance

Experimental Research and Sensitivity Analysis of Mudstone Similar Materials Based on Orthogonal Design

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