深部高应力回采巷道支护技术研究

发布时间：2018-07-04 17:16

本文选题：深部高应力 + 回采巷道　；参考：《河南理工大学学报(自然科学版)》2017年03期

【摘要】：针对深部开采巷道围岩变形快、变形量大的重大难题,根据兴东矿2121工作面回采过程中巷道围岩的变形特征,通过普氏理论计算出锚杆(索)支护参数,提出了5种不同支护方案,利用FLAC3D数值模拟软件,依次计算出各种方案的顶板下沉量和两帮移近量。结果表明:(1)深部巷道在高应力作用下,巷道围岩变形总量较大,特别是在巷道变形初期,巷道围岩变形速率大,在此条件下采用锚杆索联合支护,可以有效控制围岩的变形和破坏;(2)通过加强两帮的支护,可提高深部巷道围岩整体的承载能力,减少顶板下沉,促进顶板形成稳定结构;(3)增加锚索的预紧力,使锚杆与锚索同步承载,可大大增加支护结构的稳定性,有效控制围岩变形。现场试验表明,锚杆索联合支护可有效提高巷道围岩的承载能力,减少围岩移动和变形,具有良好的支护效果。
[Abstract]:In view of the serious problem of fast deformation and large deformation of surrounding rock in deep mining roadway, according to the deformation characteristics of roadway surrounding rock in the mining process of No. 2121 face of Xingdong Coal Mine, the parameters of bolting (cable) support are calculated by means of Purset's theory. In this paper, five different support schemes are put forward. By using FLAC3D numerical simulation software, the roof subsidence and the two side movement are calculated in turn. The results are as follows: (1) under the action of high stress, the total deformation of surrounding rock in deep roadway is large, especially in the early stage of roadway deformation, the deformation rate of surrounding rock in roadway is large, under this condition, the combined support of bolt and cable is adopted. It can effectively control the deformation and failure of surrounding rock; (2) by strengthening the support of two bands, the overall bearing capacity of surrounding rock in deep roadway can be increased, the roof subsidence can be reduced, and the roof can be promoted to form a stable structure; (3) the pretightening force of anchor cable can be increased. The stability of the supporting structure can be greatly increased and the deformation of surrounding rock can be effectively controlled by synchronizing the anchor rod with the anchor cable. Field tests show that combined bolting and cable support can effectively improve the bearing capacity of roadway surrounding rock, reduce the movement and deformation of surrounding rock, and have a good supporting effect.
【作者单位】：兖州煤业鄂尔多斯能化有限公司;中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家自然科学基金资助项目(51474218,51134025)
【分类号】：TD353

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