Dynamic compression mechanical properties of sandstone supported by Thin Spray-On Liner
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Manoj Khandelwal ; Jian Zhou [1] ; Lei Weng ; Zhongjun Ren [2] ; Xianrui Xiong [2] ; Jiaqi Wang [2] ; Shiming Wang [2]
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[1] Central South University
Central South University
China
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[2] Hunan University of Science and Technology
Hunan University of Science and Technology
China
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- Localización: Mechanics based design of structures and machines, ISSN 1539-7734, Vol. 52, Nº. 5, 2024, págs. 2554-2568
- Idioma: inglés
- Enlaces
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Resumen
Thin Spray-On Liner (TSL) has been widely used in underground engineering support such as mining due to its convenient operation and good support effect. The TSL applied to the rock is inevitably affected by dynamic loads from excavation. In order to study the support effect of TSL on a rock under dynamic load, a series of uniaxial compression experiments under static and dynamic loads are carried out on the TSL-coated specimen, and the costing thickness is 1 mm, 3 mm and 5 mm, respectively. The results showed that the TSL can improve the strength and peak strain of sandstone, and the degree of improvement is more obvious with the increase of costing thickness under static and dynamic load, and the loading rate of the dynamic load is about 70 ∼ 110 s−1. It was also found that the dynamic strength increases exponentially with strain rate, with the costing thickness increases, the strain rate index of sandstone increases. The good bonding ability and tensile properties of TSL ensure support to rock. Application of TSL can delay the time for cracks to appear in the specimen and increase the energy required for the failure of the specimen. The phenomenon was also simulated using ABAQUS, and the simulations show that TSL provides passive support that the pressure of TSL gradually increases with the deformation of the sandstone during the impact, and can delay the failure time of the specimen and reduce the number of cracks. That is consistent with the experiment.
