首页|基于Phase 2D应力折减法的巷道支护优化数值模拟研究

基于Phase 2D应力折减法的巷道支护优化数值模拟研究

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为研究不同支护方式下的巷道围岩稳定性,本文结合Phase 2D有限元软件和应力折减法,建立了无支护、锚杆支护、锚喷支护、锚喷+工字钢支架及时支护、锚喷+工字钢支架滞后支护5 组数值模型,分析了巷道围岩强度系数、位移场分布规律、围岩屈服单元体数量、锚杆支护性能等,得到了不同支护方案对巷道围岩稳定性的影响.计算结果表明:无支护巷道模型围岩屈服单元体个数为646,巷道最大位移为61.47 mm;对于锚杆支护和锚喷支护,围岩及锚杆屈服单元数不断减小,巷道最大位移降低至52.80 mm和50.98 mm;当采用锚喷+工字钢支架及时支护时,围岩及锚杆屈服单元数进一步降低为366 和190,巷道最大位移为26.31 mm;当采用滞后支护时,围岩屈服单元个数回升至535,锚杆屈服单元数量减小至0,巷道最大位移为39.59 mm.滞后支护模型能够更真实地反映巷道支护对围岩稳定性的影响,为巷道支护设计和优化提供有益的参考.
Numerical Modeling Study of Roadway Support Optimization Based on Stress Reduction Method Using Phase 2D
In order to investigate the stability of surrounding rocks for a roadway under different support patterns,five numerical models were developed in this research using the Phase 2D finite element software and the stress reduction method.The considered five models included the unsupported model,the bolt supported one,bolt-shotcrete supported and two bolt-shotcrete-I beam supported models with a timely and delayed support fashion.The strength factor of the surrounding rocks,the displacement contour,the number of yielded elements and the performance of bolts were recorded and analyzed.The results showed that the yielded elements of rocks were observed at 646,and the maximum displacement of the roadway was 61.47 mm for the unsupported model.By comparison,the yielded elements for the surrounding rocks and bolts declined for the both bolted and bolted-shotcrete models.The maximum displacements were reduced to 52.80 and 50.98 mm,respectively.For the bolt-shotcrete-I beam supported model with a timely support fashion,the number of yielded elements for the surrounding rocks and bolts were further reduced to 366 and 190.Maximum displacement was 26.31 mm.The delayed support model saw an increase in the yielded elements and displacement as compared to the previous counterpart model,with the yielded elements standing at 535 and 0 for the surrounding rocks and bolts,respectively.And the maximum displacement was 39.59 mm.The delayed model could reflect the influence of the support design to roadway stability in a more realistic manner,thus providing beneficial reference to the support design and optimization.

roadway supportsurrounding rock stabilitynumerical simulationplastic zonestress reduction method

宋高峰、高经纬、黄鹏、冀宇鑫

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北方工业大学 土木工程学院,北京 100144

鄂尔多斯应用技术学院 土木工程系,鄂尔多斯 017000

巷道支护 围岩稳定性 数值模拟 塑性区 应力折减法

2024

北方工业大学学报
北方工业大学

北方工业大学学报

影响因子:0.368
ISSN:1001-5477
年,卷(期):2024.36(4)