Abstract The bo lt ing suppo rt p rincip le is in t roduced to suppo rt roadw ays in ex t rem ely sof t seam of coal
m ine w ith comp lex roof. The m ain tenance of su rround rock s is con t ro lled by reinfo rcing comp lex roof and
two side w alls. W ith an engineering examp le, a new k ind of successfu l suppo rt ing techno logy is in t roduced.
The roof is reinfo rced u sing fu ll2co lum n resin bonded h igh2st rength bo lt s and p re2st ressed ancho r w are, and
two side w alls are st rengthened u sing h igh w ater2coagu lat ive m aterial grou t ing.
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Received: 11 January 2000
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