摘要
为解决新疆阿克特蒲2号隧道掏槽爆破效率低和岩石大块率高的问题,设计了中心空孔与掏槽孔联合爆破方案。采用ANSYS/LS-DYNA有限元软件计算不同中心空孔钻孔长度下的掏槽爆破效果,设计0.3m、0.5m、0.8m、1.0m和1.3m五种不同空孔长度的工况,并将计算结果与原始无空孔设计方案进行对比。原始方案计算结果与实际工程爆破后岩石尺寸基本一致,验证了数值模拟结果的可靠性。设置空孔后,岩石大块率明显降低。随着空孔长度从0增加至0.8m,爆破后岩石尺寸逐渐减小。当空孔长度再次增加到1m时,岩石尺寸相较于0.8m时增大。当空孔长度增加到1.3m时,岩石尺寸再次减小,同时产生了0.3m左右的超挖。综上,认为空孔长度设置为0.8m时掏槽爆破效果最佳。
In order to solve the problems of low blasting efficiency of channel and high rock fragmentation rate in the excavation of the Aktep No.2 tunnel in Xinjiang,the joint blasting scheme of central hollow hole and channel hole is designed.The blasting effects of channels under different drilling hole lengths of central hollow holes are calculated by using the ANSYS/LS-DYNA finite element software.The working conditions of five kinds of different hollow hole lengths of 0.3 m,0.5 m,0.8 m,1.0 m,and 1.3 m are designed,and the calculation results are compared with that of the original non-hole design scheme.The calculation results of the original scheme are basically consistent with the rock sizes after actual engineering blasting,which verifies the reliability of the numerical simulation results.After setting up hollow holes,the rock fragmentation rate significantly decreases.When the hollow hole length increases from 0 to 0.8 m,the rock size gradually decreases after blasting.When the hollow hole length increases again to 1 m,the rock size increases compared to 0.8 m.When the hollow hole length increases to 1.3 m,the rock size decreases again,resulting in excessive excavation of about 0.3 m.To sum up,it is believed that the optimal blasting effect of the channel is achieved when the hollow hole length is set to 0.8 m.
作者
胡景
杜伟康
丁辉
吴昆
张伟
王金昌
Hu Jing;Du Weikang;Ding Hui;Wu Kun;Zhang Wei;Wang Jinchang(Zhejiang Jiaogong Road and Bridge Construction Co.,Ltd.,Hangzhou 310051,China;College of Civil Engineering and Architecture of Zhejiang University,Hangzhou 310058,China)
出处
《北方交通》
2025年第7期64-67,72,共5页
Northern Communications
基金
浙江交工协同创新联合研究中心项目(ZDJG2021004)
浙江省科技厅科研项目(2022C03180)。
