采动矿压与锚杆轴力变化关系的实测研究
发布时间：2018-09-11 21:09
【摘要】：采用锚杆轴力无损检测技术,对采动影响区域锚杆轴力随工作面推进变化情况进行了大量现场测试,发现锚杆轴力变化与采场超前支承压力分布具有明显的对应关系。以淮南某矿回采工作面运输平巷锚杆轴力实测数据为例,检测结果表明:在距采煤工作面0~20 m范围内,受采动影响严重,锚杆轴力变化较大;在距工作面5 m范围之内,存在支承压力减压区,此区域内锚杆轴力降低;在距工作面5~20 m范围内,对应着支承压力增压区,此区域内锚杆轴力增加,且锚杆轴力峰值位于距工作面煤壁10 m左右;在20 m以外区域,受采动影响较小,对应着支承压力稳压区,此区域内锚杆轴力变化不大。在基本顶断裂后,位于减压区内的顶板锚杆轴力急剧下降,同时,位于增压区内的锚杆轴力峰值明显下降且位置向前发生跳跃前进。研究结果表明,采动支承压力分布与锚杆轴力变化存在良好的对应关系,基本顶断裂可在锚杆轴力动态响应上得到有效体现。
[Abstract]:Based on the nondestructive testing technique of anchor axial force, a large number of field tests have been carried out on the variation of anchor axial force with the working face propulsion in the area affected by mining. It is found that the change of anchor axial force has obvious corresponding relationship with the distribution of the leading supporting pressure in the stope. Taking the measured data of the axial force of the anchor rod in the transport roadway of a mining face in Huainan mine as an example, the test results show that the axial force of the bolt is greatly affected by the mining movement within 20 m from the coal mining face, and within 5 m from the working face. In the range of 520m from the working face, the axial force of the anchor rod increases and the peak value of the axial force of the anchor rod is about 10 m from the coal wall of the working face. In the area beyond 20 m, the influence of mining movement is relatively small, corresponding to the support pressure stable pressure area, the axial force of anchor in this area has little change. After the basic top fracture, the axial force of the roof bolt in the decompression zone decreases sharply, meanwhile, the peak value of the axial force of the anchor rod in the pressurized zone decreases obviously and the position jumps forward. The results show that there is a good relationship between the distribution of mining support pressure and the change of anchor axial force, and the basic top fracture can be effectively reflected in the dynamic response of anchor axial force.
【作者单位】： 中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学力学与建筑工程学院;
【基金】：国家重点基础研究发展计划(973)资助项目(2013CB227900) 国家自然科学基金资助项目(51227003,51404262)
【分类号】：TD355
本文编号：2237845
[Abstract]:Based on the nondestructive testing technique of anchor axial force, a large number of field tests have been carried out on the variation of anchor axial force with the working face propulsion in the area affected by mining. It is found that the change of anchor axial force has obvious corresponding relationship with the distribution of the leading supporting pressure in the stope. Taking the measured data of the axial force of the anchor rod in the transport roadway of a mining face in Huainan mine as an example, the test results show that the axial force of the bolt is greatly affected by the mining movement within 20 m from the coal mining face, and within 5 m from the working face. In the range of 520m from the working face, the axial force of the anchor rod increases and the peak value of the axial force of the anchor rod is about 10 m from the coal wall of the working face. In the area beyond 20 m, the influence of mining movement is relatively small, corresponding to the support pressure stable pressure area, the axial force of anchor in this area has little change. After the basic top fracture, the axial force of the roof bolt in the decompression zone decreases sharply, meanwhile, the peak value of the axial force of the anchor rod in the pressurized zone decreases obviously and the position jumps forward. The results show that there is a good relationship between the distribution of mining support pressure and the change of anchor axial force, and the basic top fracture can be effectively reflected in the dynamic response of anchor axial force.
【作者单位】： 中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学力学与建筑工程学院;
【基金】：国家重点基础研究发展计划(973)资助项目(2013CB227900) 国家自然科学基金资助项目(51227003,51404262)
【分类号】：TD355
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相关期刊论文 前1条
1 刘青康;;锚杆轴力无损检测装置的研究与设计[J];机械工程与自动化;2012年04期
，本文编号：2237845
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