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Open Access Pre-tightening effect of mine cable and its force calculation

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The pre-tightening force is a key index in bolting and anchoring engineering,because of its important influence on surrounding rock structures’ rigidity and anchorage group effect.The mechanism using ANSYS simulation and the cable’s pre-tightening course with mechanical analysis was investigated.According to its installation and pre-tighten process,a series drag springs model was put forward for mechanical analysis,which includes surrounding rock,cable,anchor cup,and anchor wedge.The difference and connection of installing tension load and pre-tightening force were analyzed in detail.Some formulas for pre-tightening force were deduced and demonstrated by a calculation example.The studies show that the bigger installing tension load,the softer rock,the longer free cable section and the better following performance of wedges,would lead to the bigger pre-tightening force and the smaller converting loss rate.In the engineering application,the super-tension,replenish-tension,optimal length of free section,improved restriction mode and lag resin bolt,could be applied to realize high pre-tightening force anchoring and better support efficiency.
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Keywords: cable; installing tension; locking converting rate; pre-tightening force

Document Type: Research Article

Publication date: February 15, 2015

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    The Journal is a unique comprehensive academic periodical completely dedicated to the coal science and mining industry in the world. The Journal stands out as an excellent source of scientific information in coal industry with nearly 400 papers published in 12 issues per annum.

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