Abstract
To study the mechanical properties of argillaceous weakly cemented rock under dynamic loading, a sample reconstituted and graded loading scheme is firstly designed, and then the reorganization rock sample is used as the research object. Using a Hopkinson pressure bar test, the responses of an argillaceous weakly cemented rock mass under different reorganization loads and different impact velocities is studied, and changes in specimen shape after impact are also analyzed. The study found that with increased of the recombination load, the amplitude of the transmitted wave increases. With increasing impact velocity, the rate of the increase in the incident wave amplitude is much larger than that of the transmission wave amplitude. The dynamic stress–strain curve can be divided into a compaction stage, an approximate linear elastic stage, a microcrack growth stage and a strain softening stage. The larger the reorganization load is, the less obvious the compression stage of the stress–strain curve is, and the greater the elastic modulus is. The peak strength and elastic modulus increase with increasing strain rate before 500 s−1. When the reorganization load is increased, the deformation decreases, and its impact resistance increases. With increasing impact velocity, the deformation of the specimen increases.
Highlights
Due to the exploitation of coal resources, the main coal producing areas in China are gradually shifting to Inner Mongolia in the north, Xinjiang in the northwest and other areas with rich coal reserves [1,2]
Argillaceous weakly cemented rock is common in these mining areas [3] and has characteristics such as low strength, poor cementation, and a tendency for weathering
The sampled rock mass can be divided into black mudstone and grey mudstone according to its colour
Summary
Due to the exploitation of coal resources, the main coal producing areas in China are gradually shifting to Inner Mongolia in the north, Xinjiang in the northwest and other areas with rich coal reserves [1,2]. As a unique type of rock, argillaceous weakly cemented rock has a tendency to lose water and weathering in low humidity conditions, as well as to absorb water and sliming under high humidity conditions, and it has characteristics of soft rock and hard soil [4,5]. When the moisture content of argillaceous weakly cemented rock is low, it has brittle mechanical properties. When the moisture content is high, argillaceous weakly cemented rock exhibits plasticity similar to that of soil [6]. The stability of such rock is extremely poor. After the excavation of rock roadways, due to the load disturbance [7,8], the internal cracks in the rock expand and penetrate the rock, and the mechanical properties markedly deteriorate
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