下分层不同层位千米钻孔稳定性研究
发布时间：2019-07-06 21:39
【摘要】：抽采钻孔的稳定性影响到抽采工程效果的好坏.采动作用下,位于底板下方不同层位千米钻孔的加卸载路径不同.为得到采动作用对不同层位钻孔稳定性的影响,分析了底板不同层位钻孔加卸载路径.依据该路径,设计十种数值模拟计算方案,对底板钻孔在不同速率加卸载、变速加卸载两种方式下的破坏范围、孔壁位移进行了分析,得到了加卸载结束后各方案对应的塑性区分布范围及加卸载过程中孔壁位移曲线.依据数值计算得到的卸载速率与形变恢复滞后性的关系,建立了考虑卸载速率变化的钻孔周边切应力计算模型.研究结果表明:加载速率对钻孔周边的破坏范围几乎不产生影响;卸载过程中,钻孔周边破坏范围与初始卸载应力及卸载速率相关,在进行底板顺层抽采钻孔布置时需综合考虑布孔位置处的应力值及卸载速率.
文内图片：
图片说明：采动作用下钻孔受力示意图
[Abstract]:The stability of extraction drilling affects the effect of extraction engineering. Under the action of mining, the loading and unloading paths of kilometer boreholes located in different layers below the bottom plate are different. In order to obtain the influence of mining action on the stability of boreholes in different layers, the loading and unloading paths of boreholes in different layers of floor are analyzed. According to this path, ten numerical simulation calculation schemes are designed to analyze the failure range and hole wall displacement of floor boreholes under different rates of loading and unloading and variable speed loading and unloading, and the distribution range of plastic zone and the displacement curve of hole wall in the process of loading and unloading are obtained. According to the relationship between the unloading rate and the lag of deformation recovery, a shear stress calculation model around the hole considering the change of unloading rate is established. The results show that the loading rate has little effect on the failure range around the hole, and the failure range around the hole is related to the initial unloading stress and unloading rate in the process of unloading, and the stress value and unloading rate at the location of the hole should be considered comprehensively when the drilling hole is arranged along the floor.
【作者单位】： 辽宁工程技术大学矿业学院;辽宁工程技术大学力学与工程学院;煤科集团沈阳研究院有限公司;
【基金】：国家重点研发计划(2016YFC0600704;2016YFC0801404)~~
【分类号】：TD712.6
，
本文编号：2511348
文内图片：
图片说明：采动作用下钻孔受力示意图
[Abstract]:The stability of extraction drilling affects the effect of extraction engineering. Under the action of mining, the loading and unloading paths of kilometer boreholes located in different layers below the bottom plate are different. In order to obtain the influence of mining action on the stability of boreholes in different layers, the loading and unloading paths of boreholes in different layers of floor are analyzed. According to this path, ten numerical simulation calculation schemes are designed to analyze the failure range and hole wall displacement of floor boreholes under different rates of loading and unloading and variable speed loading and unloading, and the distribution range of plastic zone and the displacement curve of hole wall in the process of loading and unloading are obtained. According to the relationship between the unloading rate and the lag of deformation recovery, a shear stress calculation model around the hole considering the change of unloading rate is established. The results show that the loading rate has little effect on the failure range around the hole, and the failure range around the hole is related to the initial unloading stress and unloading rate in the process of unloading, and the stress value and unloading rate at the location of the hole should be considered comprehensively when the drilling hole is arranged along the floor.
【作者单位】： 辽宁工程技术大学矿业学院;辽宁工程技术大学力学与工程学院;煤科集团沈阳研究院有限公司;
【基金】：国家重点研发计划(2016YFC0600704;2016YFC0801404)~~
【分类号】：TD712.6
，
本文编号：2511348
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