CAJ | 학술논문

为了研究大采高复合顶板煤巷的桁架锚索组合支护作用机理，采用理论分析、现场试验、数值计算试验等方法，对大采高2-1101大断面开切眼桁架锚索组合支护参数进行优化分析。研究结果显示：桁架锚索倾角在65°~75°范围内对控制围岩变形和塑性区扩展效果最好，倾角偏大或偏小均不利；桁架锚索的锚固点必须位于稳定的受压岩层内，保证桁架锚索支护系统有一个稳定的锚固基点；桁架锚索的长度为9m时对开切眼复合顶板围岩的稳定性最有利；桁架锚索钻孔的孔口至切眼巷帮距离最优值为1.5 m；顶锚杆密度为10根/排时，现场观测结果显示：两帮移近量最大值为145 mm，顶板下沉量最大值为166 mm，切眼围岩的收敛率在有效控制范围内，桁架锚索组合支护对切眼围岩控制有良好效果。
위료연구대채고복합정판매항적항가묘색조합지호작용궤리，채용이론분석、현장시험、수치계산시험등방법，대대채고2-1101대단면개절안항가묘색조합지호삼수진행우화분석。연구결과현시：항가묘색경각재65°~75°범위내대공제위암변형화소성구확전효과최호，경각편대혹편소균불리；항가묘색적묘고점필수위우은정적수압암층내，보증항가묘색지호계통유일개은정적묘고기점；항가묘색적장도위9m시대개절안복합정판위암적은정성최유리；항가묘색찬공적공구지절안항방거리최우치위1.5 m；정묘간밀도위10근/배시，현장관측결과현시：량방이근량최대치위145 mm，정판하침량최대치위166 mm，절안위암적수렴솔재유효공제범위내，항가묘색조합지호대절안위암공제유량호효과。
In order to study the truss-cable combination support mechanism in the large mining height and complex roof open-off cut, adopting theoretical analysis, field measurement, numerical simulation test method, the truss-cable support parameters in the open-off cut of large mining height 2-1101 work-ing face were optimized. The results show that if the inclination of anchor cable is too large or too small, these are not conducive to control the deformation and plastic zone of the surrounding rock. The anchor cable inclination angle of 65°~75° is the best for truss-cable support;anchor points in the truss system must be anchored into a stable rock pressured to ensure that the truss system has a stable anchoring basis point. Truss-cable drilling depth is chosen as 9 m to enhance the stability of the roadway. The reasonable distance value of the cable drilling to roadway side is 1.5 m. It is better to control the development of the surrounding rock plastic zone when the roof bolt density is 10 in each row. The results of field mea-surement show that the convergence rate of roadway section is very small. The largest value of the open-off cut two sides moving closer is 145 mm. The roof subsidence maximum is 166 mm; truss-anchor-combined support has a good effect on the controlling of surrounding rock in the open-off cut.