Optimization and engineering application of three-dimensional multi-pore groove structure based on FEM-SPH coupling simulation
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摘要: 为解决巷道掘进过程中不合理的掏槽结构带来的循环进尺不足和炮孔利用率低等问题。基于空孔效应,利用FEM-SPH(finite element method-smooth particle hydrodynamics)耦合数值模拟构建了三维掏槽爆破模型并进行仿真分析,分析了不同掏槽布置方式对岩体损伤、抛掷效果及破碎形态的影响,并结合工程现场试验分析爆后残孔深度与循环进尺进行验证。研究结果表明:单中心装药孔+五空孔的掏槽结构的自由面数量适中,应力波叠加更充分,爆破效果更好;五空孔的掏槽结构,相较于四空孔与六空孔结构,空孔模型的抛掷效果最佳,爆后槽腔口尺寸分别增大了42.5%和20.3%,槽腔剖面尺寸分别增大了52.4%和34.7%;现场试验结果表明,五空孔结构较四空孔和六空孔的掏槽结构循环进尺分别增大了10.2%和3.2%。研究揭示了空孔数量与爆破效果之间的非线性关系,适中的空孔数量可实现应力波叠加与能量集中的最优平衡,研究结果可为巷道掘进现场掏槽方案设计与优化提供依据。Abstract: To address the issues of insufficient cycle advance and low blast-hole utilization resulting from inappropriate cut blasting layouts during roadway excavation, the empty-hole effect was employed to establish a three-dimensional cut blasting model using FEM-SPH(finite element method-smooth particle hydrodynamics)coupled numerical simulation. In the numerical modeling, the rock mass was described by the RHT constitutive model, which accounts for strain-rate sensitivity and confinement effects under high-strain-rate loading. The explosive was modeled using the Jones-Wilkins-Lee equation of state. A central charged hole was surrounded by four, five, or six empty holes with a spacing of 210 mm determined theoretically. SPH particles were applied to the central zone to capture large deformation, fragmentation, and rock ejection, while the FEM was used for the outer region to reduce computational cost. Non-reflecting boundaries were set to avoid stress wave reflection. The model was then used to simulate and analyze the influence of different cut blasting arrangements on rock mass damage, rock throw efficiency, and fragmentation patterns. Furthermore, field engineering tests were conducted in a copper mine roadway to validate the simulation results by examining the residual hole depth after blasting and the achieved cycle advance. The research findings indicate that a cut blasting layout with one central charged hole and five empty holes provides a moderate number of free surfaces, allowing for more sufficient superposition of stress waves and resulting in better blasting performance. Compared to layouts with four or six empty holes, the five-empty-hole configuration demonstrates optimal rock throw effects, with the slot cavity opening size increasing by 42.5% and 20.3%, respectively, and the slot cavity cross-sectional size improving by 52.4% and 34.7%, respectively. Field test results show that the cycle advance achieved with the five-empty-hole layout is 10.2% and 3.2% higher than that of the four-empty-hole and six-empty-hole layouts, respectively. The research reveals a nonlinear relationship between the number of empty holes and blasting effects, demonstrating that the optimal balance between stress wave superposition and energy concentration can be achieved using a moderate number of empty holes, providing a basis for the design and optimization of cut blasting schemes in roadway excavation.
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Key words:
- cutting out blasting /
- void effect /
- FEM-SPH /
- field experiment
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ρ0/(kg·m−3) B0 B1 T1/GPa FS* FT* Q0 FC/MPa 2700 1.68 1.68 0.8671 0.38 0.1 0.64 8.3×10−4 A B N EC D1 D2 A1 A2 1.6 0.0105 0.6 3.×1019 0.04 1.0 0.8671 1.4567 注:ρ0为材料密度;B0,B1,T1为状态方程参数;FS*和FT*为剪压强度比和拉压强度比;Q0为拉压子午比参数;FC为单轴抗压强度;A,B和N分别为失效面参数,罗德角相关系数和失效面指数;EC为断裂压缩应变率;D1和D2为损伤参数,损伤指数;A1和A2为Hugonoit多项式参数。 表 2 炸药参数
Table 2. Explosive parameters
ρ/(kg·m−3) D/(m·s−1) p/GPa α/GPa β/GPa R1 R2 ω E0/GPa V 1140 4780 3 3.264 0.058 5.8 1.56 0.57 0.0856 1.0 表 3 MAT_SOIL_AND_FOAM材料参数
Table 3. Material parameters of MAT_SOIL_AND_FOAM
γsat/(kN·m−3) Gs/MPa K/ MPa A0/MPa A1/MPa A2/MPa pi/MPa 17 2. 524 4673 0. 001 0.0049 0.0079 -0.005 注:γsat为饱和容重;Gs为剪切模量;K为体积模量;A0、A1、A2为屈服函数中的常数;pi为拉伸断裂压力阈值。 表 4 掏槽孔爆破装药参数
Table 4. Blasting charge parameters for cut holes
断面/m 掏槽孔孔径/mm 空孔孔径/mm 炮孔与空孔的距离/mm 掏槽孔孔深/m 其他孔孔深/m 4.35×3.7 40 100 210 3.4 3.3 表 5 炸药性能参数
Table 5. Explosive performance parameters
炸药密度/(kg·m−3) 爆速/(m·s−1) 爆压/GPa 猛度/mm 药卷直径/mm 药卷长度/mm 炸药质量/g 1140 4780 3 12 32 300 300 -
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