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Pre-tightening effect of mine cable and its force calculation
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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