| 宋义敏*,张苑玉,邓文良,赵亚周,范辉远.组合岩梁弯曲变形和能量演化试验研究[J].实验力学,2024,39(4):463~473 |
| 组合岩梁弯曲变形和能量演化试验研究 |
| Experimental study on bending deformation and energy evolution of composite rock beams |
| 投稿时间：2023-06-25 修订日期：2023-09-26 |
| DOI：10.7520/1001-4888-23-128 |
| 中文关键词: 矿震 组合岩梁 弯曲变形 变形破坏 能量演化 |
| 英文关键词:mineral earthquakes composite rock beams bending deformation deformation destruction energy evolution |
| 基金项目:国家自然科学基金项目(51774015， 51774048) |
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| 中文摘要: |
| 煤系地层沉积界面多，形成多层层状岩体结构，层状岩体结构受弯致震是采矿工程中矿震发生的主要原因，研究界面黏结状态对层状岩体结构的变形和能量演化规律，有助于深入认识层状岩体变形破坏规律及矿震发生机理。本文选取黏结和无黏结2种界面组合形式的双层岩梁试件，采用四点弯曲加载实验方法，以数字图像相关方法作为实验加载全过程的观测手段，开展组合岩梁弯曲变形和能量演化实验研究，对比分析2种界面组合形式岩梁的承载力、层间滑动、能量演化特征，探究层状岩体弯曲致震机理。研究结果表明：(1)无黏结组合岩梁破坏以单个岩梁依次断裂的组合破坏方式进行，承载力曲线表现为双峰值曲线;黏结组合梁破坏以整梁一次断裂的破坏方式进行，承载力曲线表现为单峰值曲线。(2)无黏结组合岩梁层间滑动位移和拉伸位移均随着载荷增加而增大，黏结组合岩梁加载过程中的层间滑动位移和拉伸位移变化较小。(3)无黏结组合岩梁和黏结组合岩梁的能量积聚和释放特征不同，无黏结组合岩梁积聚的变形能较小，以单梁依次破坏方式多次释放能量，黏结组合岩梁积聚的变形能较大，以整梁一次性破坏方式释放能量。 |
| 英文摘要: |
| Using the digital image correlation method and the four-point bending loading method, the research work was carried out respectively from the bond and non-bond tests of double composite rock beams. The evolution processes of deformation field and energy field in the whole process of double rock beams under different conditions were studied and analyzed. The bearing capacity, interlayer slip and energy change of bonded and unbonded rock beams were compared and analyzed to explore the seismic-induced mechanism of interlayer slip in bending deformation of layered rock mass. The results show that: (1) the bearing capacity of bonded composite beams is greater than that of unbonded composite beams, while one rock beam does not completely lose its bearing capacity after fracture, which continues to resist external forces with the other rock beam. (2) The bonded rock beam behaves as a whole and breaks once after being stressed.. The unbonded composite rock beam moves independently due to the influence of interlayer sliding, and the fracture times are the same as the number of layers of the rock beam. It proves that the rock strata with interlayer constraint will have only one mine earthquake, while the rock strata without interlayer constraint will have multiple mine earthquakes. (3) The bonded composite rock beam stores more energy, which leads the damage greater when this energy is released at fracture. The energy storage of unbonded rock beams is small. The energy is released one time when the upper or lower beams are broken, which is less harmful. |
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