Experimental study of the influence of structural planes on the mechanical properties of sandstone specimens under cyclic dynamic disturbance

Du, Han; Song, Danqing; Chen, Zhuo; Guo, Zhengfu

doi:10.1002/ese3.794

Cited by 28 publications

(13 citation statements)

References 75 publications

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“…As the settlement of the dispersion in a dump is a gradual process with a decreasing settlement rate, the settlement displacement is approaching a certain value, and the settlement rate of steady Burgers creep model remains unchanged in the constant creep stage; hence, it is necessary to modify the linear component of steady Burgers and introduce a time-varying nonlinear component, namely, the unsteady Burgers creep model. Given that the settlement of the above dump finally converges to a constant, the viscosity coefficients in the nonlinear Kelvin model and the nonlinear Maxwell model are assumed as follows [36][37][38][39][40][41][42][43][44][45]:…”

Section: Settlement Creep Model After Construction Of the Dumpmentioning

confidence: 99%

“…Liu et al [26] investigated the dynamic stability of a mining slope in an open-pit coal mine under blasting load using numerical method and field monitoring method. erefore, numerical calculation and field monitoring methods have become the common methods for the study of slope stability; especially the combination of the two can make the research results more reliable [27][28][29]. However, there are few systematic studies on the settlement and deformation of the waste dump, especially on the postconstruction settlement and deformation of the fill bulk, and the corresponding calculation methods are not mature.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Deformation Law of Inner Waste Dump Slope in an Open-Pit Coal Mine: A Case Study in Southeast Inner Mongolia of China

Cao

Wang

Song

et al. 2021

Advances in Civil Engineering

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The settlement and deformation of an open-pit mine waste dump were investigated by using field monitoring and numerical methods. The creep parameters of fine soil sand in the dump fill were inverted using the steady Burgers creep model, and FLAC3D software was used to simulate the dumping soil construction and development program. The results show that the settlement displacement of the dump increases with the time of dumping soil and tends to be stable after 4 years. In the creep attenuation stage of the creep process, there is a big difference between the numerical calculation and the field monitoring results in the inversion process of fine-grained soil sand parameters. In the steady-state creep stage, the numerical calculation is consistent with the field monitoring value. The height of the fill has an influence on the settlement of the fill body of the dump and the time to reach the stability. The higher the filling height is, the greater the postconstruction settlement will be, and the longer it will take to reach stability. The pushing position of the fill body has a great influence on the settlement displacement of the dump. The time and efficiency of soil discharge can be shortened by optimizing the safe distance between the filling body and the river. Based on the numerical calculation results and the empirical settlement function, an analytical method for river channel location selection of internal dump is proposed.

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Section: Settlement Creep Model After Construction Of the Dumpmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the Deformation Law of Inner Waste Dump Slope in an Open-Pit Coal Mine: A Case Study in Southeast Inner Mongolia of China

Cao

Wang

Song

et al. 2021

Advances in Civil Engineering

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“…Taking Shanxi Province as an example, due to its rich coal resources, after years of intensive mining, it has formed nearly 2300 km 2 of goaf areas, the size of which makes it inevitable that many planned high-speed railway lines will have to pass through these goaf areas (Figure 1A). When the high-speed railway passes through the mine goaf ground (Figure 1B), the influence of the train load may lead to the separation closure or the instability of the stable structure in the mine goaf ground (Du et al, 2020), which leads to the "activation" deformation of the foundation and the uneven settlement of the high-speed railway subgrade, thus affecting the safety of the train operation (Jiang and Wang, 2019).…”

Section: Introductionmentioning

confidence: 99%

A New Classification Method of Mine Goaf Ground Activation Considering High-Speed Railway Influence

Ren

Zou

et al. 2022

Front. Earth Sci.

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With the rapid development of high-speed railways in China, it is inevitable that some of the lines will have to traverse through the mine goaf ground, and there is little research on whether the “activation” of the foundation of the mine goaf ground occurs under the influence of train loads. In order to provide a safe and reliable basis for the construction of high-speed railway in mine goaf ground, a new classification method of mine goaf ground activation is proposed considering the stability and railway influence. First, the stability evaluation system of the mine goaf site is established with 3 primary indexes and 12 secondary indexes. The 47 groups’ data of the mine goaf ground site are collected as learning samples. Five machine learning methods including decision tree, discriminant analysis, support vector machine, and classifier ensemble are used to learn and test the data. The optimal algorithm is selected and the stability evaluation model is established to classify the stability of the mine goaf site. Second, influencing factors of railway are graded to establish an extension comprehensive evaluation model. Finally, based on the above two models, a new classification method of high-speed railway goaf ground activation considering the two factors and five sub-factors is proposed. Through the verification of two engineering examples, the prediction result of this method is “easily activation” and the need to treat the goaf area, and the actual construction is also taken to grouting treatment, proving that the method has certain guiding significance for the project.

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“…During the rainy season, landslides and debris flow frequently occur in the Maoxian Group area (Song et al, 2020;Chen and Song, 2021). Besides, many previous studies are only concerned with studying the mechanical properties of bimrocks (Lin et al, 2019;Du et al, 2020;Song et al, 2021;Yu, 2021). Consequently, the flow behavior of phyllite bimrocks plays a critical role in studying the physical and mechanical properties of geological bodies in this area and has increasingly attracted the attention of many scholars and engineers (Wan et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Non-Darcian Flow in Phyllite Bimrocks With the Orientation of Blocks

et al. 2022

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Phyllite bimrocks are widely distributed in the eastern margin of the Tibetan Plateau, and it is the main geomaterial for landslides, slopes, dam basement and subgrades in this area. However, the flow behavior of phyllite bimrocks is unknown, especially the flow behavior of phyllite bimrocks with the orientation of blocks. This paper reports the coupling characteristics of flow and orientation of blocks in phyllite bimrocks. The flow behavior of phyllite bimrocks with different block percentages and block sizes was studied by a series of permeability experiments. A large-scale permeability apparatus was designed, and specimens with varying percentages of block and block sizes were produced by the same dip angle of blocks and compaction degree. Based on the Reynolds number analysis, it was found that the flow in phyllite bimrocks becomes laminar to turbulent under lower hydraulic gradient, and the flow behavior of phyllite bimrocks does not obey Darcy’s law. Furthermore, the Forchheimer equation is better at analyzing the flow behavior of phyllite bimrocks compared with Izbash equation. In addition, based on the coefficients a in the Forchheimer equation, the hydraulic conductivity of phyllite bimrocks can be calculated. The calculation result shows that when the percentage of blocks is 25%, the hydraulic conductivity reaches the minimum. Besides, the hydraulic conductivity increases approximately linear with the block size increase. On the basis of previous studies, coefficients A and B of the Forchheimer equation are detected by the normalized objective function analysis. The results would provide a valuable reference for risk assessment and prevention of phyllite bimrock slope.

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Experimental study of the influence of structural planes on the mechanical properties of sandstone specimens under cyclic dynamic disturbance

Cited by 28 publications

References 75 publications

Investigation on the Deformation Law of Inner Waste Dump Slope in an Open-Pit Coal Mine: A Case Study in Southeast Inner Mongolia of China

Investigation on the Deformation Law of Inner Waste Dump Slope in an Open-Pit Coal Mine: A Case Study in Southeast Inner Mongolia of China

A New Classification Method of Mine Goaf Ground Activation Considering High-Speed Railway Influence

Experimental Study on Non-Darcian Flow in Phyllite Bimrocks With the Orientation of Blocks

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