磨料水射流割缝裂隙带对洞库围岩稳定性的影响

Effects of Cracks Cut by Abrasive Water Jet on Stability of Surrounding Rock of Cavern

利用割缝设备在洞库上方的围岩中制造分布合理的人造节理并结合填充介质可以有效地衰减爆炸应力波。为了验证采用磨料射流割缝设备在洞库围岩中进行人工割缝及充填材料前后围岩开挖的稳定性,利用FLAC3D与Midas对磨料水射流人工割缝及充填材料前后的大跨洞库及围岩进行了数值模拟研究,对数值模拟中围岩的稳定性进行实时监测与分析。结果表明,裂隙开挖后洞库位移略有增加,但基本处于稳定状态;利用碎石进行充填裂隙后,碎石的扰动作用使其位移进一步增加,但增加量极小,洞库仍处于稳态;可利用锚杆支护减小位移、增加稳定性。因此,在洞库围岩中进行人工割缝构建填充裂隙群对于整体围岩的稳定性影响较小,研究成果可为地下工程抗爆削波防护设计提供参考。

The study shows that the use of slitting equipment to create well-distributed artificial joints in the surrounding rock above the caverns then filled with medium can effectively attenuate the blast stress waves.In order to verify the stability of the surrounding rock of caverns before and after cutting artificial cracks and filling materials in the surrounding rock with abrasive jet slit cutting equipment,FLAC3D and Midas were used to conduct numerical simulation on the long-span caverns,and real-time monitoring and analysis of the stability of the surrounding in numerical simulation were carried out.The results show that the displacement of caverns increases slightly after cracks excavation,but is basically in stable state;after filling the cracks with rubble,the disturbing effect of rubble increases its displacement,but the increase is tiny,and the caverns are still in stable state;anchor support can be used to reduce displacement and increase stability.Therefore,the construction of groups of filled cracks by artificial cutting in the surrounding rock has a negligible effect on the stability of the overall surrounding rock,and the findings can provide references for the design of anti-blasting and wave elimination for underground engineering.