深部花岗岩钻孔卸荷三维数值模拟

发布时间：2018-07-11 18:35

本文选题：深部硬岩 + ABAQUS　；参考：《应用力学学报》2017年05期

【摘要】：为了解决深部岩体掘进效率低、能耗大的问题,提出一种三维模拟的方法对深部岩石钻孔分析。采用ABAQUS软件建立动力学模型,结合切片法针对钻孔卸荷形成应力集中区域沿深度分布规律模拟分析;分析深部高应力花岗岩钻孔卸荷后形成的应力集中区沿深度变化的规律,研究在不同地应力的环境下不同钻孔深度及直径条件下应力的变化规律。结果表明:在50MPa地应力下钻孔直径为80mm和钻孔深度为120cm时,形成的应力集中区最大,成孔后岩体内部最大应力最小,卸荷效果显著。对于不同地应力的最佳钻孔卸荷参数不同,但都达到明显卸荷效果。研究结果为深部硬岩破岩机理和提高破岩效率提供了方法和理论依据。
[Abstract]:In order to solve the problems of low efficiency and high energy consumption in deep rock excavation, a three dimensional simulation method is proposed to analyze deep rock drilling. The dynamic model was established by Abaqus software, and the distribution of stress concentration region along the depth of borehole unloading was simulated and analyzed by slice method, and the variation of stress concentration area formed by deep high stress granite after unloading was analyzed. The variation of stress in different depth and diameter of borehole is studied in the environment of different in-situ stress. The results show that when the diameter of borehole is 80mm and the depth of borehole is 120cm, the stress concentration area is the largest, and the maximum stress of rock mass is minimum after the formation of hole, and the unloading effect is remarkable when the borehole diameter is 80mm and the borehole depth is 120cm. The best unloading parameters of boreholes with different ground stress are different, but the unloading effect is obvious. The results provide a method and theoretical basis for the mechanism of deep hard rock breaking and the improvement of rock breaking efficiency.
【作者单位】：辽宁工程技术大学机械工程学院;重庆大学机械传动国家重点实验室;大连理工大学工业装备结构分析国家重点实验室;矿山液压技术与装备国家研究中心;
【基金】：国家自然基金(51774161) 国家自然科学基金(51504121) 机械传动国家重点实验室开放基金(SKLMT-KFKT-201515) 辽宁省自然基金(201601324) 辽宁省优秀人才支持计划项目(LJQ2014036)
【分类号】：TD315

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