Shivani Verma, M.Eng.

DAAD Promotionsstipendiatin

Numerical and experimental characterisation of micro and macro-mechanical response of rocks under various environmental conditions at varying strain rates

Rock is a vital component of the construction industry. Since ancient times, it has been used to construct roads, railway tracks, residential structures, and underground structures, among many others. Due to environmental changes, the properties that make rocks suitable for use in construction are subject to substantial variation. This includes temperature, pressure, and saturation changes. The temperature change also includes fire-related accidents. Historically, all essential structures, such as castles, dams, and roads, were constructed from rocks. The majority of monuments in India, Germany, and other countries are composed of rocks. These monuments represent the culture and history of a nation and must therefore be safeguarded. Contrasting environmental conditions, such as high temperatures, freeze-thaw cycles, drying-wetting cycles, acid-base cycles, and static and dynamic loading, affect rocks. These environmental variations degrade the strength of the rocks. Consequently, proper precautions must be taken to protect rocks and rock structures from these circumstances. In addition, safety protocols for rocks and rock structures threatened by dynamic loading (such as blasting, rock burst, and seismic activity) must be established.

Recent events such as blast loading, earthquakes, rock bursts, and blasting have had a cataclysmic impact on society in terms of economic and human losses. These loads are erratic and arrive with a great deal of force rapidly. For the design, construction, and maintenance of rock engineering in such regions, it is crucial to have a comprehensive and in-depth understanding of rock properties. The dynamic properties of rocks are essential for rock mechanics and rock engineering problems. Due to the short duration of dynamic loading experiments, the behavior of the rock material differs significantly from that under static loading conditions. The dynamic loading test analysis is challenging and intricate. Typically, a split Hopkinson pressure bar (SHPB) is utilized for the dynamic loading analysis of a wide variety of materials. The present work mainly focuses on the characterization of rock under extreme loading conditions for the upcoming unforeseen events.

Forschungsschwerpunkte

  • Rock mechanics
  • Split Hopkinson Pressure Bar (SHPB)
  • Finite element analysis of underground tunnels
  • Blast loading