沁新矿回采巷道破坏机理与控制方法研究

发布时间：2018-04-04 20:13

本文选题：回采巷道　切入点：破坏机理　出处：《河北工程大学》2017年硕士论文

【摘要】：以沁新矿工作面回采巷道破坏控制为研究背景,通过理论分析、数值模拟、现场实践,对巷道破坏机理与控制方法进行了系统研究。在此基础上提出了采用加长锚杆支护替代锚索的新型支护方法。研究表明加长锚杆支护方法可以有效地改善围岩变形,克服了锚索延伸率低、易破断失效的缺点,消除了冒顶隐患,减少了巷道维护量。具体研究成果有如下四个方面:⑴采用钻孔窥视仪对巷道围岩结构进行探查,使用顶板离层仪对巷道水平、垂直位移进行观测,理论分析了巷道围岩变形的塑性区域。使用具有高支护阻力的加长锚杆支护体,保证巷道在采动影响期内的安全使用。对沁新矿工作面回采巷道进行了围岩变形规律、巷道支护技术研究,这些理论为采取合适的支护技术提供了基础。⑵应用FLAC3D研究了回采巷道在采动前后的巷道变形特征。对不同锚杆长度支护效果进行了对比分析,为现场支护提供理论依据。⑶回采巷道长短锚杆联合支护与锚索支护效果的对比表明,前者具有较大的柔性,能够抵御较大的变形,支护效果好;后者延伸率较低,在支护中容易破断,使巷道支护失效。⑷结合矿井工作面回采巷道实际情况,选取巷道进行工业性试验。对试验巷道不同支护方案进行对比,得出加长锚杆破断率小于锚索支护,能够较好的维护顶板完整性,保证了回采巷道的可靠性与安全。
[Abstract]:Based on the research background of roadway failure control in Qinxin coal face, the mechanism and control method of roadway failure are systematically studied through theoretical analysis, numerical simulation and field practice.On the basis of this, a new support method is put forward, in which the extended bolt support is used instead of the anchor cable.The research shows that the method of lengthening bolt support can effectively improve the deformation of surrounding rock, overcome the shortcomings of low elongation of anchor cable, easy to break and failure, eliminate the hidden danger of roof fall, and reduce the amount of roadway maintenance.The concrete research results are as follows: 1 the structure of surrounding rock of roadway is probed by drilling peepper, and the horizontal and vertical displacement of roadway is observed by means of roof dissociation instrument, and the plastic region of surrounding rock deformation of roadway is analyzed theoretically.The extended bolt supporting body with high support resistance is used to ensure the safe use of roadway in the mining influence period.The deformation law of surrounding rock and support technology of roadway in Qinxin coal mining face are studied. These theories provide basis for adopting suitable supporting technology. 2. The deformation characteristics of roadway before and after mining are studied by using FLAC3D.The results of different bolting lengths are compared and analyzed, which provides theoretical basis for the field support. 3. The comparison between the long and long bolt combined support and the bolting cable support shows that the former has greater flexibility and can resist large deformation.The latter has low elongation and is easy to break in the support, which makes the roadway support invalid. 4. Combined with the actual situation of the mining roadway in the mine face, the roadway is selected for industrial test.By comparing different supporting schemes of test roadway, it is concluded that the breaking rate of extended bolt is less than that of cable support, which can maintain the roof integrity and ensure the reliability and safety of mining roadway.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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