CAJ | 학술논문

针对复杂困难条件下煤矿巷道支护锚索普遍存在的破断问题，通过实验室试验和现场巷道顶板煤岩层变形规律验证了锚索破断的原因，并提出了针对性解决措施。研究结果表明，井下锚索破断主要有2种形式：锚索锁具附近破断和锚索中部破断。锚索锁具附近破断的原因主要是锚索工作过程中与巷道岩面垂线夹角过大造成锚索受到拉-弯-剪复合应力作用所致；锚索中部破断主要是由于顶板岩层强烈错动导致锚索在受到较大拉应力情况下受岩层弯曲错动剪切所致。针对锚索的不同破坏形式，建议采取垂直岩面布置锚索、选择延伸率较大和屈服强度比较低的1×19股锚索、减小锚索长度、增加锚杆锚索预紧力的方法来解决锚索破断问题。
침대복잡곤난조건하매광항도지호묘색보편존재적파단문제，통과실험실시험화현장항도정판매암층변형규률험증료묘색파단적원인，병제출료침대성해결조시。연구결과표명，정하묘색파단주요유2충형식：묘색쇄구부근파단화묘색중부파단。묘색쇄구부근파단적원인주요시묘색공작과정중여항도암면수선협각과대조성묘색수도랍-만-전복합응력작용소치；묘색중부파단주요시유우정판암층강렬착동도치묘색재수도교대랍응력정황하수암층만곡착동전절소치。침대묘색적불동파배형식，건의채취수직암면포치묘색、선택연신솔교대화굴복강도비교저적1×19고묘색、감소묘색장도、증가묘간묘색예긴력적방법래해결묘색파단문제。
In order to solve breakage problem of anchored cable generally occurred in roadway with complex and difficult conditions, applying laboratory experiment and field observation of roof deformation, breakage cause of anchored cable was obtained and counter-measures was put forward. Results showed that there were 2 positions of anchored cable breakage:one was near lockset and the other was at middle part of anchored cable. The first position breakage was resulted from tension-bend-shear combined stress which was caused by large angle of anchored cable and vertical line of rock-face. The second position breakage was resulted from large tension stress which was caused by rock strata strong dislocating. For different breakage, following countermeasure was put forward including arranging anchored cables which were vertical to rock-face, applying 1×19 anchored cable with large ductility and low yield strength ratio, reducing anchored cable length and adding anchored bolt and cable pre-force.