Sunita Mishra

Indian Institute of Technology Kharagpur | IIT KGP · Department of Mining Engineering

In the present work, dynamic stress-strain response of two rocks from different regions in India, e.g. Kota sandstone and Dholpur sandstone have been investigated through split Hopkinson pressure bar (SHPB) test at different strain rates for the first time in the literature. The dry and saturated density, specific gravity, static compressive streng...

The present study aims to characterize the free stream flow of the newly installed recirculating water tunnel facility in the BIAHR Laboratory at the Indian Institute of Technology Kharagpur. This tunnel can operate at speeds ranging from 0.05 m/s to 0.40 m/s in the test section. The dimension of the test section is 400 × 400 × 1500 mm3 in width, d...

Fish schools and bird flock formation is an interesting phenomenon that could emerge from specific hydrodynamic interactions. Aerodynamics for self-propulsion of a single heaving NACA0017 airfoil has been numerically investigated to understand these interactions. Simulations using Ansys Fluent have been performed to examine the effect of heaving fr...

The lack of space above the ground has forced human civilization to go underground for sustainability. It is not only space but also comfort that plays a key role in the development of such an underground structure. Nevertheless, it is crucial to acknowledge that underground structures, specifically tunnels, are vulnerable to fire and blast loads i...

It is quite impractical to ascertain the in-situ mechanical behavior of rocks subjected to high temperature and high confining pressure under dynamic loading conditions. Hence, the present study aims to numerically determine the thermo-mechanical properties of Kota sandstone rock under dynamic compressive loading conditions using a split Hopkinson...

Crack propagating at the rock-tool interface is of paramount importance while designing an excavation process. The present study aims to analyze the behavior of a crack propagating in brittle material like sandstone rock in comparison to ductile material like Aluminum alloy. A three-dimensional finite element model of split Hopkinson pressure bar s...

Mining and construction activities in rock have been the backbone of major developments taking place around the world. It is quite a well-known fact that rock is a heterogeneous material with multiple cracks, joints, joint sets, and fissures developed during its formation. These cracks may develop into major failure planes in case of any catastroph...

Development of sustainable design for civil engineering infrastructure against extreme loads, e.g., natural hazards like earthquake or man-made hazards like blast loading have always been the key priority for a country's defence sector and projects of national importance. These hazardous events are highly transient in nature and generates strain ra...

The present work aims to numerically study the effect of a pre-defined crack in a sandstone specimen under dynamic compressive loading conditions. First, the validation study was carried out with the experimental data for the intact rock specimens of sandstone rocks tested using compressive split Hopkinson pressure bar device. The results for sands...

This paper aims at to establish a novel approach of gravity blind backfilling method for abandoned mine voids using suitable backfill materials. Gravity blind backfilling is an important aspect for controlled movement of the overlying strata and efficient reduction of surface subsidence over unapproachable water-logged as well as dry underground co...

Drilling of rocks through the conventional techniques of percussion, rotation, or combined percussive rotational loading methods consumes a huge amount of energy and time to obtain the required hole length for a definite application. Controlled blasting could be one such technique to drill holes through rocks which has been seldom explored in the l...

Split Hopkinson pressure bar (SHPB) tests are performed on Himalayan phyllite rock with five different specimen sizes and with different gas gun pressures and striker bar lengths of the SHPB device. The high strain-rate phyllite parameters investigated are the peak stress, strain at peak stress, dynamic increase factor (DIF), strain energy absorbed...

The present work aims to understand the stress-strain response of an igneous rock, metadolerite, typically found in dyke form, under high loading rate. The high strain rate characterisation of metadolerite rock is done for different specimen sizes through detailed tests using a 76 mm diameter split Hopkinson pressure bar (SHPB) device in an effort...

In the present work, the rate-dependent stress-strain responses of limestone and dolomite, sedimentary rocks are determined by using a split Hopkinson pressure bar device under a high loading rate. The petrographical, physical, and mechanical responses of the rocks are studied through detailed experimental and numerical analyses. For experimental a...

In this paper, the stress-strain response of two extrusive volcanic igneous rocks, e.g., compact basalt (CB), and volcanic breccia (VB) under high rate of loading is studied experimentally and numerically. The dynamic characterization of rocks is done for five different specimen sizes using a split Hopkinson pressure bar (SHPB) device of 76 mm diam...

The present study aims to investigate the physical, petrological and mechanical properties of ten different types of rocks in the Indian subcontinent, required for the design of structures built in rocks. A comparative assessment is done for the stress-strain response of all the rocks collected under three main categories, e.g., igneous, sedimentar...

The present work aims to gain an understanding into the stress-strain response of sandstone, a sedimentary rock, under high loading rate and further determining the appropriate specimen dimension of sandstone for dynamic testing. The high strain rate characterisation of sandstone is done for two different diameters and five different slenderness ra...

In the present work, dynamic stress-strain response of Himalayan dolomite is tested under high loading rates using 38 mm split Hopkinson pressure bar (SHPB) device. The physical and static mechanical properties of dolomite e.g. density, specific gravity, static compressive strength and elastic modulus values are also determined. Petrological studie...

The present work aims to understand the stress-strain response of a metamorphic rock, gneiss under high loading rate for different specimen diameters and slenderness ratios through detailed tests. The high strain rate characterisation of gneiss rock is done for two different diameters and five different slenderness ratios of the rock specimens usin...

The present work aims to understand the stress-strain response of an igneous rock, granite under high loading rate through detailed experimental and numerical analyses. The high strain rate characterisation of granite rock is done for two different diameters and five different slenderness ratios of the rock specimens using a 76 mm diameter split Ho...

In the present study, a comparative assessment on the performance of conventional and advanced tunnel lining materials subjected to blast loading is done by using a three-dimensional (3D) non-linear finite element (FE) analysis procedure. The conventional tunnel lining materials analyzed herein are plain concrete (PC), steel, reinforced cement conc...

In the present work, dynamic stress-strain response of Himalayan limestone is tested under high loading rates using 38 mm split Hopkinson pressure bar (SHPB) device. The physical and static mechanical proper-ties of limestone are also determined. Petrological studies of limestone are carried out through X-ray dif-fraction (XRD) test and scanning el...

In the present work, dynamic stress-strain response of granite is tested under high loading rates using 38 mm split Hopkinson pressure bar (SHPB) device. The physical and static mechanical properties of granite e.g. density, specific gravity, static compressive strength and elastic modulus values are also determined. Petrological studies of granite...

In the present work, dynamic stress-strain response of compact basalt is tested under high loading rates using 38 mm split Hopkinson pressure bar (SHPB) device. The physical and static mechanical properties of compact basalt e.g. density, specific gravity, static compressive strength and elastic modulus values are also determined. Petrological stud...

In the present work, dynamic stress-strain response of three rocks, e.g. compact basalt, metadolerite and granite are tested under high loading rates using 38 mm diameter split Hopkinson pressure bar (SHPB) device for the first time in the literature. The static characterization of the rocks e.g. physical and static mechanical properties of three r...

In the present work, dynamic stress–strain response of five sedimentary and three metamorphic rocks from different regions of India, e.g. Kota sandstone, Dholpur sandstone, Kota limestone, Himalayan limestone, dolomite, quartzite, quartzitic gneiss and phyllite have been investigated through split Hopkinson pressure bar test at different strain rat...

In the present work, dynamic stress-strain response of Himalayan quartzite is tested under high loading rates using split Hopkinson pressure bar (SHPB) device for the first time in the literature. The physical and static mechanical properties of quartzite e.g. dry and saturated density, specific gravity, static compressive strength and elastic modu...

This paper presents the static and dynamic experimental characterization of dolomite subjected to static unconfined compressive strength test and dynamic split Hopkinson pressure bar (SHPB) tests. The dynamic compression tests on rock samples are performed at strain rates from 500/sec to 1500/sec. It is observed from the results that the rocks exhi...

This paper presents the static and dynamic experimental characterization of limestone subjected to static unconfined compressive strength test and dynamic split Hopkinson pressure bar (SHPB) tests. The dynamic compression tests on rock samples are performed at strain rates from 500/sec to 1500/sec. It is observed from the results that the rocks exh...

This paper presents static and dynamic experimental characterization of quartzite rock subjected to static unconfined compressive strength test and dynamic split Hopkinson pressure bar (SHPB) tests. The dynamic compression tests on rock samples are performed at strain rates from 10 −1 /sec to 10 3 /sec. It is observed from the results that the rock...

Mountainous rocks have been beneficial in developing the pathway for water flow in hydropower projects which aids in attainment of renewable source of energy. With the increase in the development of hydropower projects in mountains, the concern towards its design optimality increases to various hazards e.g. earthquake, bomb blast or missile attacks...

In the current study, a review on the response of soils subjected to high strain rate loading is presented. High strain rate loading on soil may be applied through high loading rate uniaxial compression tests, triaxial tests, split Hopkinson pressure bar (SHPB) tests, and shock tube test. Herein, the results of SHPB tests from the literature have b...