锚杆支护巷道巷旁锚索加强支护沿空留巷围岩控制机理研究及应用

STUDY ON CONTROLLING MECHANISM OF SURROUNDING ROCKS OF GOB-SIDE ENTRY WITH COMBINATION OF ROADSIDE REINFORCED CABLE SUPPORTING AND ROADWAY BOLT SUPPORTING,AND ITS APPLICATION

沿空留巷技术在薄、中厚煤层中应用较多,但在3m以上较大采高工作面中应用极少,究其主要原因是已往建立的沿空留巷力学模型欠妥、巷内与巷旁支护方式不合理。从如何提高岩层的自我承载能力入手,提出了一种主动的巷旁加强支护方式——巷旁采用锚索加强支护,巷内采用锚杆支护。建立了考虑巷帮煤体承载作用和巷旁锚索加强作用的沿空留巷力学模型,并分析了巷内锚杆支护和巷旁锚索加强支护的作用机理。利用理论分析所得结论,对淮北朱庄矿3625较大采高工作面风巷进行巷旁支护设计及工程实践。研究成果为较大采高工作面沿空留巷技术提供了理论依据和借鉴经验。

The gob-side entry retaining technology is widely used in the thin or medium thick coal seam, but rarely employed in the over-3-meter mining-height working face. The reasons mainly lie in the following two aspects: firstly, the traditional mechanical model for the gob-side entry is unsatisfactory and secondly, the roadway and roadside supports are unreasonably placed. By taking into consideration of the bearing capacity of rocks, this paper presents a reinforced active supporting technique, consisting of the cable-reinforced roadside supporting technique and the roadway bolt-supporting technique. For practical purpose, a new mechanical model is established, taking into account both the roadside coal bearing capacity and the reinforcing effects of the roadside cable-support. The improved supporting mechanism with the combination of the roadway bolt-supporting technology and the reinforced roadside cable supporting technology is analyzed. The results are applied successfully to the design and engineering practice in the airway of the high working face No.3625 of Zhuzhuang Mine, Huaibei. The research result provides a theoretical basis and some useful experience for the gob-side entry retaining work of large mining-height working faces.