| 李利萍*,鞠翔宇,潘一山,王淋,邰英楼.弱围压与垂直冲击强扰动下块系岩体超低摩擦效应试验研究[J].实验力学,2019,34(6):1068~1076 |
| 弱围压与垂直冲击强扰动下块系岩体超低摩擦效应试验研究 |
| Experimental study of anomalously low friction effect of block rock mass subjected to weak confining pressure and strong vertical impact disturbance |
| 投稿时间：2018-05-03 修订日期：2018-05-19 |
| DOI：10.7520/1001-4888-18-092 |
| 中文关键词: 超低摩擦效应 弱围压 垂直冲击载荷 冲击地压 块系岩体 |
| 英文关键词:anomalously low friction effect weak confining pressure vertical impact load rock burst block rock mass |
| 基金项目:辽宁省自然科学基金项目(201602353)；国家自然科学基金项目(51474120) |
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| 中文摘要: |
| 随开采深度增加，深部岩体结构趋于破碎，临近工作面待开采岩体受弱围压作用，遇冲击载荷强扰动时，易诱发超低摩擦型冲击地压。采用自主研制的弱围压块系岩体超低摩擦模拟试验装置，以5个上下叠加花岗岩块体模拟深部临近工作面破碎岩体，通过螺栓加载方式对块系岩体施加弱围压作用、垂直方向施加冲击载荷作用模拟强扰动。以垂直加速度差值变化作为超低摩擦效应强度特征参数，分析得到了冲击载荷强度、围压对块系岩体超低摩擦效应影响规律。研究结果表明：垂直冲击载荷作用下，块系岩体振动分为受迫振动和自由振动两个阶段，随冲击载荷增大，块体垂直加速度差值峰值增大，垂直加速度差值衰减时间延长，此时超低摩擦效应强度和持续时间均显著增加；围压与冲击载荷共同作用下，存在围压临界值使得超低摩擦效应强度达到最大；随围压增加，超低摩擦效应最大强度发生时刻提前，当试验围压达到最大值时，超低摩擦效应最大强度发生时刻趋于一致。 |
| 英文摘要: |
| With the increase of mining depth, the structure of deep rock mass tends to be broken. When the rock mass under mining near the working face is subjected to weak confining pressure, and when the impact load is strongly disturbance, it is easy to induce anomalously low friction type rock burst. In this paper, self-developed anomalously low friction simulation experimental device of weak confining block rock mass is used to simulate the broken rock mass near deep working face by using five superimposed granite blocks. The weak confining pressure is applied on the block rock mass by bolting loading method, and vertical impact load is applied to simulate strong disturbance. Taking the variation of vertical acceleration difference as the characteristic parameter of anomalously low friction effect strength, the influence of impact load strength and confining pressure on the anomalously low friction effect of block rock mass was analyzed. Results show that the vibration of block rock mass can be divided into two phases: forced vibration and free vibration under the vertical impact load. With the increase of impact load, the vertical acceleration difference of block increases, and the vertical acceleration difference attenuation time extension. This moment, the intensity and duration of anomalously low friction effect increase significantly. Under the combined action of confining pressure and impact load, the critical value of confining pressure makes the maximum intensity of anomalously low friction effect. With the increase of confining pressure, the maximum strength of anomalously low friction effect occurs earlier. When the experimental confining pressure reaches the maximum, the maximum strength of anomalously low friction effect tends to be consistent. |
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