Hard rocks under high strain-rate loading
WebJul 29, 2024 · This paper presents a study of the mechanical behaviour of rock under dynamic compression loading at intermediate strain rate (ISR). A series of laboratory tests were carried out to obtain... WebAug 28, 2024 · The stress–strain response of rock, its peak stress, and stiffness are significantly affected when subjected to such high rate of loading (Blanton 1981; Li and …
Hard rocks under high strain-rate loading
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WebAug 1, 2024 · The process of rock failure under load involves energy absorption and release. Assuming that a rock is in an ideal state without heat exchange during its physical deformation under external loads, the first law of thermodynamics has the following relationship31: (1) U = U d + U e WebMay 1, 2016 · The strain rate effect governs the changes in the compressive strength of dry rocks, characterizing a reduction in low dominant frequencies of AE waveforms with increasing strain rates. Whether the strain rate effect or water-weakening effect plays a dominant role depends largely on the rock types and loading regimes.
WebOct 1, 2024 · Rock blasting can generate a strain rate higher than 10 3 s −1 and as high as 10 10 s −1 at the explosion centre due to higher plasticity in this process. Nonetheless, the change of rock brittleness under high strain rates is still lacking quantitive studies. WebWhen ν = 0.25, a fairly common value for rock, the horizontal stress from gravitational loading is one-third of the vertical stress. According to Heim's rule, on the other hand, hydrostatic conditions are assumed. The in situ stress field may result as well from tectonic, thermal, or other effects.
WebJul 12, 2024 · Progressive failure behavior of cracked rock specimens under high loading rates was analyzed using high-speed photography and digital image correlation technique. Results show that the X-shaped shear failure mode is the final failure modes of all specimens, regardless of crack intensity. WebNov 5, 2024 · Numerical methods for modeling the behavior of brittle materials under load [8,12] are in a certain sense similar to the methods of testing real samples [7, 8,13], since digital models and real ...
WebKnowledge regarding the time-dependent behavior of rocks is essential to estimate the long-term deformation and stability of underground structures. The rock strength …
WebSep 10, 2024 · Considering the problems related to hard rock blasting under high in-situ stresses at large depths, we conducted crater blasting tests on sandstone specimens under three static load conditions to investigate the strain field evolution of … suzy shier shoppingWebFinally, the characteristic strain rate of the Carrara Marble has been reported by as 65 s -1 . Additionally, Zou and Wong (2016) reported DIFs between 4.0 -7.0 at strain rates … skechers shop manchesterWebRock mass is often under dynamic loading induced by blasting or earthquake. In this case, the rocks always experience an internal cracking process through the stages of crack initiation, propagation, and coalescence . In blasting, the loading strain rate ranges within 10 … skechers shop in londonWebThe RHT model has been used successfully in several applications.;The purpose of this research was to characterize one rock type as an example of a hard brittle rock. The … suzy shier summer dressessuzy shier phone numberWebKnowledge regarding the time-dependent behavior of rocks is essential to estimate the long-term deformation and stability of underground structures. The rock strength increases with the increasing loading rate. However, the loading rate dependence in postfailure regions under confining pressure remains unclear. In this study, triaxial compression … skechers shop merry hillWebJan 5, 2024 · In order to investigate the high loading rate effect on the behaviour and mechanical properties of coal-rock combined body, the dynamic compressive tests were … suzy shier toronto