井下巷道偏导支护方案设计及数值模拟分析
Design and numerical simulation analysis of guide support scheme for underground roadway
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摘要: 为有效控制巷道走向变形失稳，提出了偏导倾斜长锚杆支护方案；通过理论分析巷道走向方向的应力传递过程，建立偏导支护力学模型，设计了优化偏导支护方案并采用FLAC3D数值模拟方法进行对比运算。结果表明：使用偏导倾斜长锚杆可以有效控制巷道整体变形量，优化-偏导支护方式可以减小巷道内原有支护造成的围岩局部应力集中；同时加设倾斜长锚杆的巷道，其顶板中大部分破坏较为单一，在巷道二次补强及维护方面具有优势；通过偏导支护方案优化，减少了45.45 %的钢棚使用量，降低了23.56 %的支护成本，一定程度上验证了偏导支护的可行性。Abstract: In order to effectively control the deformation and instability of roadway strike, a partial guide inclined long bolt support scheme is proposed. Through the theoretical analysis of the stress transfer process in the direction of roadway, the mechanical model of partial guide support was established, and the optimized partial guide support scheme was designed and compared with the FLAC3D numerical simulation method. The results show that the partial guide long bolt can effectively control the overall deformation of roadway, and the optimized partial guide support can reduce the local stress concentration of surrounding rock caused by the original support in roadway. At the same time, most of the damage in the roof of the roadway with inclined long anchor is relatively single, which has advantages in the secondary reinforcement and maintenance of the roadway. Through the optimization of partial guide support scheme, the use amount of steel shed is reduced by 45.45 % and support cost is reduced by 23.56 %, which verifies the feasibility of partial guide support to a certain extent.
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