کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
809589 1468702 2014 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of a novel energy-absorbing bolt with extraordinarily large elongation and constant resistance
ترجمه فارسی عنوان
توسعه یک گیره جذب انرژی جدید با کشیدگی فوق العاده بزرگ و مقاومت ثابت
کلمات کلیدی
پیچ و مهره جذب انرژی، لغزش لغزش، پشتیبانی سنگ آزمون کشش استاتیک، آزمون افتادن وزن
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی


• A novel energy-absorbing bolt was developed with unique working resistance generation mechanism.
• Bolt can yield at high strength with large elongation in response to the loading.
• Stick-slip model was established to model the load–elongation behavior of the bolt.
• Static pull tests and dynamic impact tests were conducted to validate the analytical solutions.

This paper presents an innovation work on the development of a novel energy-absorbing bolt characterized by an extraordinarily large elongation and high constant resistance. The bolt has a compound structure consisting of a cone-like piston sliding inside an elastically-deformable sleeve pipe. The frictional resistance generated by the sliding of the cone body relative to the internal surface of the sleeve pipe was mathematically formulated which is dependent on the elastic property of the sleeve pipe, the geometry of the cone and the frictional properties of the sliding interface, and independent of the external loads under the static loading conditions. A dashpot element for the cone-sleeve relative motion, termed “stick-slip element”, was proposed in construction of the lumped-mass model of the bolt for development of the constitutive equations that exhibits a frequency-dependent frictional behavior and a stick-slip oscillating response. The results from the static pull tests compared very well with the predicted working resistances, energy-absorbing capacity and elongations. The time-marching scheme of the bolt׳s impact load from the weight-dropping tests evolves with the pulsation response in the initial phase, stick-slip oscillation in the subsequent regime over which the dynamic energy is consumed, and a quasi-linear attenuation in the later phase. It demonstrates the fact that this bolt is robust in damping the dynamic load. The analytical work in this study provides solutions in the assessment of the large deformation and establishment of the forewarning precursors associated with deep mines.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Rock Mechanics and Mining Sciences - Volume 67, April 2014, Pages 29–42
نویسندگان
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