坚硬顶板水力致裂最佳割缝位置的模拟
Simulation of Hydraulic Fracture Best Slotted Position of Hard Roof
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摘要: 对于煤层厚度较厚、倾角起伏，且老顶过于坚硬、悬顶长度较长、整体结构稳定的地质赋存条件，应力容易区域集中，高能量也积聚在顶板中，易导致冲击危险性加大。采用水力致裂技术，破坏老顶的整体结构，使老顶损伤而释放能量，结合渗流-应力耦合分析软件F-RFPA2D对老顶定向水力致裂割缝最佳位置进行模拟，得出如下结论：在老顶距直接顶最上边界之间，缝的位置在老顶中间及靠近直接顶致裂效果最佳；在老顶中间连线割两缝水平对称分布致裂效果也易达到最佳。
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关键词:
- 坚硬老顶 /
- 定向水力致裂技术 /
- F-RFPA2D模拟 /
- 割缝最佳位置 /
- 割缝对称分布
Abstract: For the geological structure of thick coal seam, undulating angle, long hanging arch, extremely hard roof and stable overall structure, the stress tends to concentrate regionally, and high energy also accumulates in the roof, which increases the risk of rock-burst. This article takes the hydraulic fracturing technology to break the overall structure of hard roof, and release the energy through damaging it. Combined with seepage-stress coupling analysis software F-RFPA2D, the best slotting position has been simulated by using roof directional hydraulic fracturing technology. Conclusions are drawn as follows. Between the main roof and the upper boundary，the slot locates in the middle of the main roof or closes to the immediate roof，and crack extension works best; in the middle of the main roof，two slots are in the level of symmetric distribution, and crack extension works best too. -
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