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利用数值模拟方法,研究长壁开采三顺槽在工作面不同开采阶段中锚杆和锚索的受力变化特征。研究结果表明:工作面回采过程中,顺槽中的锚杆轴力处于动态变化之中,锚杆预紧力的施加应和采动响应相适应;三顺槽中顶锚杆中间的三根直锚杆轴力增加较大,应施加较小预紧力以期望得到大工作轴力;三顺槽中顶锚杆两边的斜锚杆轴力变化较小,应施加较大预紧力以得到大工作轴力;三顺槽中两边顺槽靠近中间顺槽的帮部中心附近锚杆轴力增大较大,应施加较小预紧力,其它帮锚杆轴力变化较小,应施加较大的预紧力已获得大工作轴力;中间顺槽锚索轴力增加较小,可以施加较大的预紧力,两边顺槽锚索轴力变化较大,均应施加较小预紧力。
The numerical simulation method is used to study the force variation characteristics of anchor bar and anchor cable in different mining stages of longwall mining face. The results show that during the mining process, the axial force of bolt in the groove is in dynamic change, and the prestressing force of bolt should be adapted to the mining response. The three straight The axial force of the anchor should increase greatly and a small pre-load force should be applied in order to obtain the large working axial force; the axial force of the inclined anchor on both sides of the middle anchor in the three-way groove changes less, and a larger preload force should be applied to obtain Large working axial force; the axial force of anchor rod near the center of the gangway near both sides of the three-way groove is larger, and a smaller pre-tightening force should be applied; Large prestressing force has obtained a large working axial force; in the middle of the slot, the axial force of the anchor cable increases little, and a large pretension force can be applied. Tight.