【摘 要】
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More than 170 years ago, Louis Agassiz, one of the creators of glacial theory, made his first attempt to drill into the bed of Unteraargletscher, Alps.Since that time, various systems for ice drilling
【机 构】
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Polar Research Center, Jilin Unversity, Changchun, China, 130026
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More than 170 years ago, Louis Agassiz, one of the creators of glacial theory, made his first attempt to drill into the bed of Unteraargletscher, Alps.Since that time, various systems for ice drilling were designed and tested-many of them were quite effective but some proved temperamental.Depending on the nature of the ice disintegration at the boreholes bottom, all developed methods of ice drilling can be divided into mechanical systems and thermal systems.Mechanical drilling tools can use percussion or rotary fracturing of ice, but most commonly use cutting.In principle, it would be possible to use the conventional rotary drilling technology for drilling into ice, and early rotary drilling yielded acceptable drilling rates.However, considering the power consumption and the weight of conventional rotary drilling rigs, they are difficult to use for glacial exploration.For ice drilling, special purpose drilling equipment and technology were designed and tested in various institutes throughout the world.
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